Best Smart Contract Audit Firms in 2026: An Honest Comparison
Two audit quotes for the same codebase land on a founder’s desk on a Monday, and one is roughly four times the other. The scoping documents do not line up, one firm has priced a fix round separately, the other has not mentioned one, and the launch is seven weeks out. Nobody can say which difference is scope and which is margin.
A ranked list does not settle it, because the three best-known comparisons for this query are each published by a smart contract audit firm that places itself first. Cyfrin ranks Cyfrin at one, Sherlock ranks Sherlock at one, and Hashlock ranks Hashlock at one. Sherlock is the only one that says so.
We do the same thing, and we are saying so before you find it. WebThree Consulting sits at number one below, for one stated buyer profile, on weightings we fixed before we knew the order, and our own entry prints three limitations that cost us real business. The scoring is in the methodology section, so you can re-run it and disagree with us.
Ten firms are ranked on five criteria, compared in two tables, and scored on a rubric we publish in full. If you have not settled what an audit should cover, read what an audit scope actually covers first. The goal is a defensible shortlist, not a crown.
Key Takeaways
- Every ranking of smart contract audit firms that ranks for this query is written by a firm that appears on it, so re-score the ones that print weightings and discard the ones that do not.
- Code4rena announced in May 2026 that it is winding down, so any ranking that still lists it as an option is out of date.
- The strongest single vetting question is whether the firm can show you a public audit report on your runtime from the last twelve months.
Table of Contents
- Key Takeaways
- What “Smart Contract Audit Firm” Actually Means in 2026
- How to Choose a Smart Contract Audit Firm (and How We Scored These)
- The 10 Best Smart Contract Audit Firms in 2026
- The Ten Firms Compared, Side by Side
- Services, Specializations, and Methodologies Compared
- What Actually Drives Smart Contract Audit Cost in 2026
- Honorable Mentions: Firms That Did Not Make the Ten
- Chain Coverage: Where the Shortlist Actually Splits
- The Nine Questions to Ask Before You Sign
- Fixed-Scope Audit vs. Competitive Contest vs. Bug Bounty
- Conclusion
- FAQs
What “Smart Contract Audit Firm” Actually Means in 2026
A smart contract audit firm is a security company that reviews blockchain code before deployment, reports exploitable findings by severity, and verifies the fixes before the code goes live. The useful boundary is a firm running a scoped manual review with named auditors, not a platform selling an automated scan with a badge. The scan finds known patterns. The firm finds the logic that is wrong only in your protocol.
Directories list more than a hundred blockchain audit companies, and between them they sell three shapes of engagement that end up quoted against each other. Boutique and enterprise firms sell a fixed scope reviewed by employees. Contest platforms sell a competitive audit contest, a prize pool split among independent researchers. Formal verification specialists sell proof that named properties hold and nothing about properties nobody wrote down.
The mechanism is the same in every shape. A reviewer reads your code against a threat model, and the report is worth exactly what that reviewer knows about your runtime. That fluency is the product you are buying.
For the phases, deliverables, and what a report should contain, the definition post on what a smart contract audit covers owns that ground. This page owns who to buy it from.
How to Choose a Smart Contract Audit Firm (and How We Scored These)
Five criteria, each with a published weighting. The weightings were written before the order. Every firm was scored 1 to 5 against each one, the weighted average produced the ranking, and the scores are printed in the first comparison table so anyone can check the arithmetic.
The evidence base is at least one public report from each of the fourteen firms that publish one, dated February 2021 to August 2026, plus every firm’s own services page read on September 5, 2026. Marketing claims, logo walls, self-reported total value secured, and self-reported vulnerability counts were excluded, because nobody outside the firm can audit the last two.
Verifiable auditor quality and named reviewers
The people who read your code matter more than the logo on the report. A good answer is a report that names its reviewers and a services page that names its senior researchers. A bad answer is a report attributed to the firm only, a pseudonymous pool with no named lead, or work that is quietly subcontracted. Trail of Bits, Guardian, and Hacken name reviewers on their reports, and Cyfrin names its researchers on its services page; Hashlock, OpenZeppelin, and ChainSecurity name the firm and nobody else. A structural second reviewer, such as OpenZeppelin’s two-per-line rule or ChainSecurity’s independent dual review, earns one point back.
This criterion carries 15 percent.
Public report volume and report quality
A public report is the only evidence of an audit that exists outside the firm’s own claims, so the best smart contract auditors are the ones whose reports you can open. A good answer is a dated repository with a severity taxonomy and a fix-status line per finding. A bad answer is a count on a homepage. As of September 2026, Trail of Bits states 620 public reports, Hashlock states 254, and we publish none.
This criterion carries 10 percent, the lowest weight, because it measures firm size more than what a small team receives. It is also the one we score worst on.
Re-weight it if you disagree.
Runtime and specialization match
An audit record is runtime-specific. A good answer is a public report on your runtime, Solidity, Rust, Move, or Cairo, from the last twelve months, plus work in your protocol category. A bad answer is a chain logo list. If you are buying a DeFi security audit, ask for lending, automated market maker (AMM), or vault reports specifically because the failure modes in DeFi architecture patterns differ by category.
This criterion carries 15 percent.
Accountability and what happens after delivery
The report is the midpoint of the engagement, not the end of it. A good answer is a fix-verification round inside the quoted engagement, the same named auditor re-checking each finding, and a straight answer about audited protocols that were later exploited. A bad answer is a fix round quoted after the report lands, or silence on the exploit question.
This criterion carries 25 percent.
Scope transparency and timeline fit
A firm that will not tell you what a quote depends on until after a full scoping call is sending a signal, not stating a policy. A good answer is a firm that publishes its scoping questions or a written market reference, and gives you a start date before the call. A bad answer is “depends on scope” followed by a four-week wait. Of the ten firms below, one publishes cost guidance and one publishes its scoping questions.
This criterion carries 35 percent, the highest weight, because the profile this list serves has a budget and a launch date before it has a shortlist.
The 10 Best Smart Contract Audit Firms in 2026
This list is ranked for one buyer profile: a protocol team buying its first or second audit, on a Solidity, Rust, or Move codebase under roughly 5,000 lines, on a first-audit budget with a launch inside 90 days. A different profile reorders it: the top smart contract audit firms for a nine-figure bridge are Trail of Bits, OpenZeppelin, and ChainSecurity, not the top three here.
Fifteen firms were scored, and a sixteenth, Code4rena, was excluded before scoring because it announced in May 2026 that it is winding down, and its own homepage now reads that it is closing its doors. Ties resolve on criterion five.
1. WebThree Consulting (us)
Type: Boutique fixed-scope audit, Solidity, Rust, and Move.
Website: webthreeconsulting.com
WebThree Consulting is a Web3 development and security consultancy built for protocol teams shipping their first or second audit, the stage where a scope in writing matters more than a logo wall. The team reviews Solidity, Rust, and Move code across Ethereum Virtual Machine (EVM) chains, Solana, and Move-based chains, and delivers a scoped manual review with severity ratings, remediation guidance, and a retesting round. More than 300 projects supported worldwide sit behind that, for teams including Oracle Red Bull Racing, Seedify, and REKT.
What sets WebThree Consulting apart on this list is the shape of the engagement rather than its size. The audit page asks for contract count, chain, repository status, and launch timeline before anything is quoted, so a founder knows what is being bought before the number arrives, and the retesting round sits inside the same engagement rather than in a second conversation. The focus stays on the questions a first-audit team actually asks, which contracts are in scope, which runtime, whether the repository is frozen, and when the launch is, instead of on volume claims nobody outside the firm can check.
Strengths:
- Publishes the scoping questions a quote depends on, which eight of the other nine firms do not, and lists retesting among the audit deliverables.
- Takes engagements at the size a first-audit team actually has, on a launch window measured in weeks.
Limitations (honest version):
- A deliberately small senior team rather than a multi-team bench, built for codebases under roughly 10,000 lines, where one team can hold the whole design in its head. A 20,000-line codebase that needs two teams in parallel belongs with Trail of Bits or OpenZeppelin.
- Coverage is focused on Solidity, Rust, and Move, with no Cairo or zero-knowledge circuit work on record and no auditor names on the service page, so a Starknet or ZK protocol should pick a specialist further down this list.
2. Sherlock
Type: Hybrid, competitive contests plus collaborative private audits.
Website: sherlock.xyz
Sherlock got to the honesty move before anyone else, admitting in its own ranking that it had placed itself at one. The model is a contest first. A protocol posts a pot, a pool the site puts at more than 11,000 registered researchers competes for it, and the report that comes out names every contributor by handle. Sherlock also runs collaborative private audits alongside the contests. It is the only firm on this list willing to put cost guidance in public, in a market reference for 2026 audit pricing that scales the estimate by lines of code, runtime, and complexity.
Strengths:
- Contest reports are public and name their contributors, and the market reference adds duration estimates by lines of code, which nobody else here does.
- Sherlock paid a $4.5 million claim to Euler Finance after the March 2023 exploit, and no other firm here has matched that in cash.
Limitations (honest version):
- The market reference is guidance rather than a Sherlock rate card, and re-audit rounds are listed as a separate per-pass line instead of inside the quote.
- The Euler function that failed had been through a Sherlock audit in July 2022 and was exploited eight months later, a sequence The Block’s report on the payout lays out.
3. Cyfrin
Type: Hybrid, named in-house researchers plus the CodeHawks contest platform.
Website: cyfrin.io
Cyfrin runs two shops under one name. The private side is a team whose services page names its senior researchers, and the public side is CodeHawks, a contest platform that posts each prize pot before the contest opens. The site lists 18 supported chains, Ethereum, Solana, Sui, Aptos, and Starknet among them, and the published process does not end at the report: step four is a verification pass in which the same researchers re-check every issue after the fixes land.
Strengths:
- One vendor covers both engagement models, with named researchers on the private side and a contest arm on the public side.
- Fix verification is a published step in the process rather than a priced add-on.
Limitations (honest version):
- The report library on the site showed only stale 2022 to 2023 placeholder entries when checked, and the current reports have to be found on GitHub.
- Bunni lost $8.4 million on September 1, 2025, three months after a Cyfrin audit that found more than 50 issues, and the Bunni postmortem on rekt.news records that the rounding path behind the exploit was not among them.
4. Hashlock
Type: Boutique fixed-scope audit, EVM plus 15 named chains.
Website: hashlock.com
Hashlock built the comparison-table format this whole category now copies, and unlike most of the firms that copied it, its own numbers survive a check. The GitHub archive holds 254 public audit engagements, with another 26 under non-disclosure agreement (NDA). The cost calculator page, read in September 2026, says a typical audit completes in 2 to 4 weeks, and the homepage describes a revision stage in which the firm goes back over the codebase once the fixes are in.
Strengths:
- A large open archive sits beside an included re-audit, a combination that is rare at this size.
- The stated 2 to 4 week turnaround and a quote inside 24 to 48 hours fit a 90-day launch window with room to spare.
Limitations (honest version):
- Reports name the firm rather than the auditors, and the public sample leans toward token contracts while the flagship work sits under NDA.
- The severity scale runs High, Medium, Low, Gas, and QA (quality assurance) with no Critical tier, so lining it up against a second firm’s report takes translation.
5. Trail of Bits
Type: Enterprise fixed-scope audit with in-house fuzzing and formal methods.
Website: trailofbits.com
Trail of Bits is the firm the other enterprise shops measure themselves against, and the public record is why. The reports page lists 620 public reports, the blockchain page counts 443 public engagements across Ethereum, Solana, Aptos, Sui, Starknet, TON, and Cosmos, and the same page says patches are re-tested when they land rather than waved through. Those figures were read in September 2026, and they are the deepest verifiable record among the enterprise firms.
Strengths:
- It has the deepest public record and the widest named runtime coverage among the enterprise firms, with fix-review retesting as standard.
- When Balancer v2 was exploited in November 2025, Trail of Bits published its own Balancer analysis within four days, showing the exploit traced to a vulnerability it had reported to the client in 2021.
Limitations (honest version):
- Nothing is published on price or timeline, and engagements are scoped in person-weeks, so a first audit on a first-audit budget has no obvious way in.
- Balancer is also the warning. A finding the client left unfixed for four years cost more than $100 million, and no auditor, however good, can force a fix.
6. Hacken
Type: Fixed-scope audit, named auditors, Solidity, Rust, and Move.
Website: hacken.io
Hacken has the largest archive of named-auditor reports on this list, and it is not close. The audits index counted 2,134 public security assessments across 1,171 companies when read in September 2026. Open one, the April 2026 HODLBonds report, for instance, and you get two named auditors, a named approver, and a resolution status against every finding. The service page also commits to a two-week window for in-scope fixes before deployment, so the fix round is part of the engagement rather than a second conversation.
Strengths:
- Every public report names the auditors and the approver, at a volume no boutique matches.
- The two-week remediation window sits inside the engagement, so the fix round never becomes a second quote.
Limitations (honest version):
- The public portfolio leans toward token, vesting, and launch-stage projects, so a lending or AMM protocol should ask for category-specific reports before signing.
- No price is published, and Hacken’s own HAI token was drained in June 2025 through an exposed bridge key on a decommissioned server, which was an infrastructure failure rather than an audit miss, and still a bad week for a security firm.
7. Guardian
Type: Boutique fixed-scope audit with fuzzing, EVM and Solana.
Website: guardian.security
Guardian Audits became Guardian during 2026, and the pitch on its audits page is three independent passes over the same code: a manual team, an AI-assisted team, and an invariant fuzzing campaign, each unaware of what the others found. The reports name every auditor and print the fuzzing metrics, which makes them the easiest reports on this list to actually read. The top Vanguard tier, as its page described it in September 2026, adds a funded public contest and post-launch update auditing.
Strengths:
- Reports name their reviewers and print fuzzing metrics, the most legible format of the ten.
- The top tier includes post-launch update auditing, which answers the after-delivery question before you ask it.
Limitations (honest version):
- There is no public report count and no audit price, and the rebrand copy leans on marketing language the reports themselves do not need.
- The pages show EVM and Solana work and nothing on Move or Cairo, so those teams should look elsewhere.
8. OpenZeppelin
Type: Enterprise fixed-scope audit, every line read by two researchers.
Website: openzeppelin.com
OpenZeppelin wrote the libraries most Solidity codebases already import, so it has probably read more of your dependencies than you have. Its audit process is the most explicitly documented of the ten. The audits page, read in September 2026, claims 900 plus audits since 2017, promises at least two researchers on every engagement with every line inspected twice, and calls the fix review as important as the audit itself. A January 2025 post puts a number on the pace: the team performed 400 audits in 2024.
Strengths:
- Public reports carry a resolution line for every finding, down to the pull request and commit, which is the clearest fix trail in the category.
- Coverage runs to Starknet, Stellar, Sui, and ZKsync as well as Ethereum, so a non-EVM team is not treated as an exception.
Limitations (honest version):
- Reports are credited to OpenZeppelin Security rather than to named researchers, and nothing is published on price or timeline.
- The Balancer v2 pools exploited in November 2025 were added after OpenZeppelin’s audit had closed, which the firm states plainly, and which is a reminder of how fast an audit’s scope goes stale.
9. ChainSecurity
Type: Enterprise fixed-scope audit, independent dual review.
Website: chainsecurity.com
ChainSecurity puts two auditors on every project and keeps them apart, so each one reads the code without knowing what the other has found, and it then adds an internal challenger whose job is to argue with both. The reports are versioned rather than replaced. The August 2026 Spark report, for example, carries three dated versions, and every finding closes with a status of Code Corrected or Specification Changed. The site names Ethereum, Solana, Starknet, Sui, Aptos, Arbitrum, and Tron and commits to a fixes review and re-audit once the client has resolved the findings.
Strengths:
- The dual independent review is a real structural difference, and the versioned reports show the fix trail without a separate document.
- Central bank and institutional work sits alongside the DeFi work, which matters if you are a regulated issuer.
Limitations (honest version):
- Individual auditors are not named anywhere, and the site offers no pricing or duration guidance at all.
- KyberSwap lost roughly $48 million in November 2023 on a version ChainSecurity had audited, and the public record does not confirm whether the exploited tick math was inside that scope.
10. Certora
Type: Formal verification specialist with manual audit.
Website: certora.com
Certora is the formal verification entry and the only firm here whose core product is a set of machine-checked invariants delivered alongside a manual report. You write down the properties your protocol must never violate, the Prover checks them against the code, and the report tells you which ones hold. The reports page runs to August 2026, coverage spans EVM, Solana, Stellar, and Sui, and the pricing page publishes a free Prover tier of up to 2,000 minutes a month while keeping audit fees off the page.
Strengths:
- Verified rules can be re-run every time the code changes, which is something no manual audit can offer.
- Public reports carry a dated mitigation review, with every finding marked Fixed, Acknowledged, or Partially Fixed.
Limitations (honest version):
- The proof covers only the properties someone thought to write down. Silo Finance lost roughly $545,000 in June 2025 to a vulnerability that, by Certora’s own incident report, its manual review that month did not identify.
- Audit pricing is contact-sales only, and formal verification adds cost and calendar time that a first-audit team rarely has.
The Ten Firms Compared, Side by Side
This table puts the ten side by side, with the two columns no competitor table fills: post-audit exploits and a named limitation for every row. The score is the weighted average from the methodology, and the bracketed figures are the five criterion scores in the order the criteria appear, so you can re-weight them yourself.
| Firm | Type | Public reports | Post-audit exploits | Supported chains | Named limitation | Score |
|---|---|---|---|---|---|---|
| WebThree Consulting | Boutique fixed-scope | 0 published | None publicly reported; no public record either way | EVM, Solana, Move chains | Deliberately small team, Coverage is focused on Solidity, Rust, and Move, | 3.75 (2, 1, 4, 4, 5) |
| Sherlock | Hybrid, contest plus private | Public, no count | Euler, Mar 2023, $4.5 million claim paid | EVM, plus non-EVM contests | Market reference, not a rate card; re-audit priced separately | 3.60 (3, 5, 4, 4, 3) |
| Cyfrin | Hybrid, private plus CodeHawks | Public, no count | Bunni, Sep 2025, rounding path not caught | 18 chains named, including Solana, Sui, Aptos, Starknet | Report library hard to find | 3.45 (4, 4, 5, 4, 2) |
| Hashlock | Boutique fixed-scope | 254 public | None publicly reported | 15 plus chains named, including Solana, Sui, Aptos | No named auditors, no Critical tier | 3.35 (2, 4, 4, 4, 3) |
| Trail of Bits | Enterprise fixed-scope | 620 public | Balancer, Nov 2025, reported 2021 and unfixed | EVM, Solana, Aptos, Sui, Starknet, TON, Cosmos | No price, no self-serve entry | 3.35 (5, 5, 5, 4, 1) |
| Hacken | Fixed-scope, named auditors | 2,134 public | None publicly reported; own token drained Jun 2025, infrastructure | 15 chains named, including Solana, Aptos, TON | Portfolio skews to launch-stage projects | 3.25 (5, 4, 5, 4, 1) |
| Guardian | Boutique with fuzzing | Public, no count | None publicly reported | EVM, Solana | No count, no price | 3.20 (5, 3, 3, 4, 2) |
| OpenZeppelin | Enterprise fixed-scope | Public, 900 plus audits self-reported | Balancer pools outside audit scope | EVM, Starknet, Stellar, Sui, ZKsync | Unnamed researchers | 3.05 (3, 4, 4, 5, 1) |
| ChainSecurity | Enterprise dual review | Public, no count | KyberSwap, Nov 2023, scope unconfirmed | EVM, Solana, Starknet, Sui, Aptos, Tron | Unnamed auditors | 2.95 (3, 3, 4, 5, 1) |
| Certora | Formal verification | Public, no count | Silo, Jun 2025, missed in manual review | EVM, Solana, Stellar, Sui | Proof covers only written properties | 2.90 (3, 4, 4, 3, 2) |
Pulled from each firm’s own site on September 5, 2026.
Read the exploit column before the score column. A firm with a named incident and a public postmortem has shown you how it behaves after a loss.
A firm with none may simply have no public record to check.
Services, Specializations, and Methodologies Compared
Most firms quote smart contract audit services as one line, and the item that moves most between two quotes is whether fix verification sits inside that line. This table isolates that column.
| Firm | Key services | Specialization | Audit methodology | Fix verification included |
|---|---|---|---|---|
| WebThree Consulting | Fixed-scope audit, remediation guidance | First and second audits, DeFi on EVM, Solana, Move | Manual review, severity ratings, retesting | Retesting listed as a deliverable |
| Sherlock | Contests, collaborative audits, bug bounties | Pre-launch DeFi, token events | Crowdsourced review with judging | Not stated; re-audit priced per pass, market reference |
| Cyfrin | Private audit, CodeHawks, formal verification | Multi-chain DeFi | Manual review then contest, four-step process | Yes, step four |
| Hashlock | Fixed-scope audit, cost calculator | Token and protocol launches | Line-by-line manual review | Yes, revision stage |
| Trail of Bits | Audit, fuzzing, formal methods | Bridges, nodes, high-value DeFi | Manual review with in-house tooling | Yes, fix-review retest |
| Hacken | Audit, proof of reserves, compliance | Token and launch-stage projects | Manual review, named auditor and approver | Yes, two-week fix window |
| Guardian | Audit, fuzzing, contests, bounty match | DeFi on EVM and Solana | Three independent passes | Not stated; post-launch update auditing in top tier |
| OpenZeppelin | Audit, monitoring, libraries | Institutional and L2 infrastructure | Two researchers per line | Yes, fix review phase |
| ChainSecurity | Audit, institutional review | DeFi and central bank work | Independent dual audit | Yes, fixes review and re-audit |
| Certora | Formal verification, manual audit | Invariant-heavy protocols | Prover specs plus review | Not stated; mitigation review shown in reports |
Pulled from each firm’s own site on September 5, 2026.
Seven of ten list a fix-verification or retesting round as part of the engagement. Ask the other three what it costs before you compare totals.
What Actually Drives Smart Contract Audit Cost in 2026
No firm on this list, can quote from a homepage, and the Sherlock market reference cited above is the only public guide to how the number moves: it scales with lines of code, climbs for Rust and Move over Solidity, and climbs again for zero-knowledge circuits. Treat any range you are shown as a commonly cited industry figure to verify at quote time, not a fixed rate.
Four variables move the cost on any audit quote. Lines of code in scope set the base, and Sherlock’s estimates run from roughly 3 days at 500 lines to 38 days at 6,000. Dependency and integration depth multiplies it because every external call is a second codebase to model. The runtime sets the premium described above. Turnaround pressure adds a rush premium when the report is needed inside two weeks. The first two move the number furthest.
Two quote traps show up on real scoping calls. The first is a per-line price that excludes dependencies, so the number doubles once integrations are added back. The second is a fixed price with fix verification quoted separately after the report lands, which is where a quote quietly grows by the size of a second engagement.
If the fix round is not in writing, it is not in the quote.
If you are budgeting from a build number, the rule in the founder’s guide to hiring a Web3 developer is to set aside a fixed share of build cost for audit and remediation. Budget the fix round as well as the report.
Honorable Mentions: Firms That Did Not Make the Ten
Five firms carried real evidence and still scored below the best smart contract audit companies for this profile. Four are written up below; the fifth, Sigma Prime, scored 2.60 with no published price, timeline, or reviewer names. Each one missed for a reason you can check.
Cantina (Spearbit), named reviewers inside a broader platform: Spearbit’s homepage now reads that Spearbit lives on Cantina, an AI-driven security platform with a Web3 audit line. Every portfolio report names its researchers and links fix status to commits. Fix reviews are billed as their own engagements, no chain list or price is published, and Cork Protocol, exploited in May 2025, had a Cantina audit that month with the exploited path’s scope unconfirmed. It scored 2.85.
Quantstamp, longest track record: Auditing since 2017, Quantstamp names its auditors on its report PDFs and keeps a public report library. It publishes no price and no timeline, and its services page states no fix-verification policy a buyer can hold it to. It scored 2.70.
Consensys Diligence, Ethereum depth: Reports are public with named auditors, defined severities, and per-finding resolution notes. Coverage is Ethereum-centered, and no report volume, price, or timeline is published. It scored 2.70 as well.
CertiK, largest by audit volume: CertiK describes itself as the largest Web3 security platform, and its product page states 6,198 audited projects, a self-reported figure beside a self-reported total value secured that nobody outside CertiK can audit. Reports credit CertiK rather than named auditors, no price is published, and a search for “CertiK audit list” surfaces Skynet project pages rather than a repository. It scored 2.55.
Chain Coverage: Where the Shortlist Actually Splits
Before the questions, one more filter. A firm’s audit record is runtime-specific and mostly non-transferable, so a shortlist built for an EVM deployment is not a shortlist for a Solana or Move deployment. An Ethereum smart contract audit tests reentrancy, proxy upgrade paths, and token approval edge cases. A Rust smart contract audit on Solana tests account validation, program-derived address seeds, and compute limits.
The reviewer fluent in one is not automatically fluent in the other.
That is why the chain column in the first table matters more than the score column for a non-EVM team. Of the ten, Guardian names EVM and Solana only, eight name Sui, Aptos, or Move, and Starknet, which runs Cairo, appears on the pages of Cyfrin, Trail of Bits, OpenZeppelin, and ChainSecurity. A Rust smart contract audit company with no public Solana report from the last twelve months is selling a brand name rather than a record. The same test applies to a Move or Cairo shop quoting on a program it has never reviewed.
If your deployment is not EVM, or is EVM plus one more runtime, the companion post on how audits differ by chain covers the per-runtime failure patterns this page leaves out.
The Nine Questions to Ask Before You Sign
Every criterion above collapses into a question you can ask on the first call. This is the smart contract audit checklist, and you have explicit permission to run it on us. A bad answer to a question this specific tells you something a homepage never will.
- Which named auditors will work on this? Good: two or three names with public reports. Bad: “our senior team” and no names.
- Show me a public report on my runtime from the last twelve months. The strongest of the nine. Good: a dated report with finding IDs. Bad: an NDA excuse for every engagement.
- Is fix verification included in this quote? Good: yes, by the same auditors, in writing. Bad: a separate quote after delivery.
- What is your severity taxonomy? Good: defined tiers with exploitability and impact criteria. Bad: labels with no definitions.
- What is explicitly out of scope? Good: a written scope of work listing the contracts and dependencies excluded. Bad: “everything in the repository.”
- Do you subcontract any part of this? Good: no, or yes with names. Bad: a pause.
- What happens if we find a critical vulnerability after delivery? Good: a stated re-review policy and a postmortem example. Bad: “that has never happened.”
- Which protocols you audited were later exploited, and what changed? Good: a named incident and a process change. Bad: none, said quickly.
- What is your written scope and start date before a full scoping call? Good: a scope in writing and a week. Bad: “depends on scope.”
Two bad answers are worth more questions. Three should end the call.
Fixed-Scope Audit vs. Competitive Contest vs. Bug Bounty
Smart contract auditing comes in three engagement models, and they buy three different things. A fixed-scope audit buys accountability and a named reviewer who reads every line against a threat model. A competitive audit contest buys breadth of eyes cheaply because dozens of researchers compete for a pot, and the winners are the ones who found what the others missed. A bug bounty buys ongoing coverage after launch and no pre-launch assurance at all.
The common mistake is treating a bounty as a substitute for a pre-launch review. A bounty pays after the code is live and the funds are at risk, and the researcher who finds the critical vulnerability can also be the attacker who exploits it.
For a first or second DeFi security audit on a codebase under 5,000 lines, the right shape is a fixed-scope review with fix verification, then a bounty at launch. A protocol holding nine figures adds a contest between the two and never skips the first.
Conclusion
Five criteria with published weightings produced this order, we sit first on it for one stated profile, and moving ten points between two criteria hands first place to Sherlock. That is what a reproducible ranking looks like. Open two public reports from every firm on your shortlist. Ask for the named auditors. Get fix verification in writing. Run the nine questions on us.
If you want a written scope and a start date before the scoping call, book a free 30-minute smart contract audit call. We’ll send you a scoped proposal, a list of what’s in and out of scope, and the name of the auditor who’d read your code. If another firm on this list is the better fit for your runtime or your size, we’ll say so, and our smart contract audit services page carries the scoping questions we ask first.
FAQs
Which companies offer smart contract audits?
Trail of Bits, OpenZeppelin, Sherlock, Cyfrin, and WebThree Consulting all offer smart contract audits as of September 2026, alongside Hashlock, Hacken, ChainSecurity, Certora, and Guardian. A list of names goes stale inside a quarter, so select on evidence instead: a public report on your runtime, named auditors, and fix verification inside the quote.
How much does a smart contract audit cost?
It depends on scope, and any firm that quotes before seeing the scope is guessing. Lines of code set the base, dependency depth multiplies it, and Rust, Move, and zero-knowledge work carry a premium over Solidity. Ask for the scope in writing before the number, and treat any published range as a starting point.
Is smart contract auditing worth it?
Yes, whenever the value at risk on day one of mainnet exceeds the audit fee by a wide margin, and most protocols clear that bar. It is not worth it for a pre-revenue testnet holding no user funds, where the money is better spent on tests. Chainalysis counted over $3.4 billion stolen in 2025.
How much does a smart contract auditor make?
$200,000 to $280,000 base is what senior smart contract auditors earn in 2026, per DeFinitive Talent’s salary benchmarks, with principal roles above $280,000. That figure is a sanity check. A two-auditor, two-week review costs a firm several weeks of senior salary, so a quote that undercuts that arithmetic is buying hours that do not exist.
Should I trust a ranking written by an audit firm that ranks itself first?
Only if it publishes its weightings and its own limitations, and we publish both. The three best-known comparisons for this query, from Cyfrin, Sherlock, and Hashlock, all place their publisher first, and only Sherlock says so. A ranking you can re-score from the printed rubric is evidence; one you cannot is advertising.
How long does a smart contract audit take?
Two to four weeks is the range Hashlock publishes for a typical audit, and Sherlock’s duration estimates run from roughly 3 days at 500 lines of code to 38 days at 6,000. Unaudited dependencies and integration depth are the two things that stretch it, since each external call adds a second codebase.
What is the difference between a blockchain audit and a smart contract audit?
A smart contract audit reviews application code: the contracts, their storage, and their external calls. A blockchain audit is a looser term for node software, consensus logic, or a whole protocol stack. Blockchain audit companies quote both, so make the vendor define which one is on the invoice, because the two differ tenfold in scope.
Does an audit guarantee my contracts are secure?
No, and any firm implying otherwise is a red flag. An audit is a bounded review by named people at a point in time, covering one commit and nothing after it. Wharton research on nearly 10,000 reports found that audits, on average, do not reduce breach likelihood, though top-tier auditors are associated with fewer breaches.
Can one firm audit my contracts on every chain I deploy to?
Rarely, and the claim is worth checking. Runtime fluency does not transfer, so a reviewer strong on an Ethereum smart contract audit is not automatically strong on a Rust smart contract audit, where account validation replaces reentrancy as the first check. What settles it is a public report on that runtime by a named auditor.
Do I still need an audit if I use audited libraries?
Yes, because the composition is what breaks. Audited components combined in a new configuration produce failure modes none had alone, particularly around access control and economic assumptions. Euler Finance was drained in March 2023 through a donation function that Omniscia’s Euler postmortem records as outside its audit scope, sitting beside liquidation logic it touched.