Audit a smart contract free — no account, no card.
Deploy to any supported testnet, paste the address, and run the full detector suite. You get the same report a paid scan produces, watermarked. No email wall, no "request a demo", no drip sequence.
What the free audit includes
Free tiers in this industry usually mean a score out of 100 and a paywall over the findings. This one does not work that way, so it is worth being precise about where the line sits.
| Feature | Free testnet scan | Paid audit |
|---|---|---|
| 20+ static detectors | Included | Included |
| SWC Registry + OWASP coverage grid | Included | Included |
| Full finding list with code locations | Included | Included |
| Downloadable PDF report | Watermarked | Clean |
| Account required | No | Yes |
| Mainnet contracts | Testnets only | All networks |
| Paste source / upload .zip | Address scans only | Included |
| AI deep analysis, Slither, attack paths | Not included | Pro and Enterprise |
What makes the smart contract audit free here is worth stating plainly: testnet tokens have no value, so a testnet scan is somebody evaluating the tool rather than shipping a product. That is cheap for us to give away and genuinely useful to you, so it is unlocked. A mainnet report is the deliverable people hand to investors, and that is the paid product.
Audit smart contract free: the five-step loop
If your contract is not deployed yet, this is the fastest useful loop available to you, and it costs nothing to repeat.
- Deploy to a testnet. Any of the 8 supported networks works — Sepolia and BNB Testnet are the usual choices.
- Verify the source on the explorer. This is the step people forget. The scanner pulls source by address, so an unverified contract cannot be read. Verification is free and takes a minute with Hardhat or Foundry.
- Paste the address, pick the network, run. The testnet group in the scan form is marked free, no sign-in.
- Fix, redeploy, rescan. There is no limit, so iterate until the report is clean.
- Then buy one mainnet audit once the code has stopped moving — the report you show people should describe the code you actually shipped.
What free will not do for you
Three limits worth knowing before you rely on this, because the gap between them and what people assume is where projects get hurt.
A watermarked testnet report is not a credential. It says the engine ran against a contract on a network where nothing is at stake. Presenting it as "we are audited" is a misrepresentation your community will eventually check.
The free tier is static only. AI deep analysis is where business-logic traps, tokenomics abuse and honeypot patterns get caught, and it is a paid feature. The static engine will not tell you your reward maths is exploitable; it will tell you your reward function has no access control.
No automated pass replaces expert review of novel design. This is true at every price point, and it is covered honestly on the automated audit page and in the comparison of audit firms.
Who the free scan is genuinely right for
- Solo builders pre-launch, iterating on a token or NFT contract and wanting to catch the obvious things before spending money.
- Teams evaluating the tool before buying — run it on a contract whose bugs you already know and check whether the output matches.
- Students and auditors learning the trade, who want a fast second opinion on practice contracts.
- Anyone reviewing a testnet deployment of a protocol they are considering investing in.
If you are past that point and the contract is live with real money in it, the honest recommendation is a paid scan — start with the pricing breakdown to work out which tier fits.
Frequently asked questions
Is the free smart contract audit actually free?
Yes, and there is no card and no account. Pick any supported testnet, paste a verified contract address, and the full static engine runs — the same 20+ detectors and the same standards coverage as a paid scan. The PDF downloads with an evmsmart.com watermark so it cannot be passed off as a paid audit.
What is the catch?
The free tier is limited to address scans on test networks. Testnet tokens have no value, so a scan there is a trial rather than a deliverable — that is what makes it affordable to leave unlocked. Mainnet audits, pasted source and project uploads need an account and a plan.
Can I audit my mainnet contract for free?
Not on the free tier — mainnet scans are the paid product, from $150. The usual path is to deploy your contract to a testnet first, scan it there for free as many times as you like while you fix findings, then run one paid mainnet audit for the record once the code has settled.
Is the free report any good, or is it a teaser?
It is the real report. Risk gauge, severity breakdown, standards coverage grid and every finding with its code location and remediation — the same document a paid scan produces, with a watermark. There is no deliberately withheld section designed to make you upgrade.
Which testnets can I use?
BNB Testnet, Sepolia, Holesky, Polygon Amoy, Arbitrum Sepolia, Base Sepolia, OP Sepolia, Avalanche Fuji — 8 networks in total. If your contract is verified on that network's explorer, it can be pulled by address.
Can I see a report without running anything at all?
Yes. Sample reports in all three styles are downloadable from the home page, so you can read a finished audit end to end before deciding whether to run your own.
Run your free scan now
Pick a testnet in the scan form, paste your verified address, and the report is yours in minutes.
Start audit