Free Smart Contract Audit Tool

Q: Is the free smart contract audit really free?

Yes — the first scan is completely free and requires no account. Paste your Solidity, Vyper, or Rust code and get AI-powered vulnerability analysis in under 60 seconds. The free tier processes one contract per session. Creating a free account gives you 5 scans per month. Paid plans (from $100/month) give 150–250 scans per month with full report export for exchange listing packages.

Q: How does AI auditing compare to a manual audit from a firm like Trail of Bits?

AI auditing and manual auditing are complementary, not competing. AI excels at coverage breadth across known vulnerability patterns — it catches reentrancy, access control failures, integer overflow, oracle manipulation, and proxy storage collisions faster and cheaper than any human team. Manual auditors excel at novel logic bugs — business logic errors, economic attack paths specific to your protocol's design, and cross-protocol interactions. The recommended workflow: AI scans throughout development to fix the known issues, then engage a manual firm for final pre-launch review so their hours are spent on logic analysis, not basic pattern matching.

Q: What programming languages does the free audit support?

Solidity (EVM chains: Ethereum, Base, Polygon, Arbitrum, Avalanche, BNB Chain), Vyper (Python-syntax EVM contracts), and Rust (Solana Anchor programs). For Sui Move, Cairo (StarkNet), and TON FunC/Tact contracts, paste the code and the analysis engine will process chain-specific patterns.

Q: What does the free audit NOT cover?

The free AI audit focuses on smart contract code. It does not cover off-chain infrastructure (hot wallet key management, oracle signer security, API endpoint security) — which was the attack surface in the Ostium ($23.75M, July 2026) and Triple-A ($11.8M, July 2026) hacks. It also does not cover social engineering, team background, or governance token distribution. For a full-stack security review, use the AI audit for contract-level coverage and a specialized penetration testing firm for off-chain infrastructure.

Q: Can I use the free audit report for an exchange listing or investor due diligence?

The free scan report documents the security state of your contracts. For exchange listings (Coinbase, Binance, OKX) and institutional investors, a report from a named audit firm is typically required in addition to AI analysis. The recommended approach: run AI scans to fix all flagged vulnerabilities, then engage a recognized firm for the final named report. Starting with AI analysis typically reduces manual audit costs because the easy findings are already fixed before the firm begins.

Quick Answer

Paste Solidity, Vyper, or Rust code below — AI analyzes for reentrancy, access control failures, oracle manipulation, integer overflow, flash loan attack surfaces, and 15+ other vulnerability classes.
Results in under 60 seconds. No account required for the first scan. Findings include severity, description, and recommended fix.
AI auditing is a pre-audit layer — fix the findings here before paying $15k+ to a manual firm to find the same issues. Traditional audits cost $15,000–$150,000 and take 4–12 weeks.

3/3 Free Scans Remaining

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Paste your smart contract code below and get instant security analysis

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By scanning, you agree to our Terms of Service. Results are an automated scan, not a security audit.

What the Free Audit Checks

Coverage across all EVM-compatible chains plus Solana. As of July 2026.

Category	What's Detected	Covered
Reentrancy	CEI pattern violations, cross-function reentrancy, read-only reentrancy	Yes
Access Control	Missing owner checks, unprotected admin functions, role misassignment	Yes
Integer Overflow/Underflow	Unchecked arithmetic, SafeMath gaps, Solidity 0.8 unchecked blocks	Yes
Flash Loan Attacks	Single-block manipulation vectors, oracle price feed dependencies	Yes
Oracle Manipulation	TWAP vulnerabilities, single-source price feeds, stale price checks	Yes
Proxy/Upgrade Vulnerabilities	Storage collision, uninitialized proxies, implementation slot exposure	Yes
MEV Exposure	Sandwich attack surfaces, frontrunning vectors, commit-reveal gaps	Yes
Denial of Service	Gas griefing, unbounded loops, array length manipulation	Yes
Off-Chain Infrastructure	Key management, oracle signer security, off-chain API dependencies	No
Social Engineering	Team trust, key holder verification, physical security	No

What to Do After Your Free Scan

Fix flagged issues

Address each finding by severity: Critical and High first. Re-scan to verify the fix didn't introduce new issues.

Run again on final code

Audit your pre-deployment version — not your development draft. The final contract may have changes that introduce new issues.

Engage a manual firm

For exchange listings or institutional investment, you'll need a named auditor's report. Start with AI to fix easy issues, then pay the firm to focus on protocol logic.

Free AI Audit vs. Manual Audit Firm

Feature	AI Audit (Free)	Manual Firm
Time to first result	< 60 seconds	4–12 weeks
Cost	Free	$15,000–$150,000+
Reentrancy detection	✓ Automated	✓ Manual
Access control analysis	✓ Automated	✓ Manual
Oracle manipulation	✓ Automated	✓ Manual
Novel business logic bugs	Partial	✓ Specialized
Off-chain infrastructure	✗ Not covered	Add-on engagement
Exchange listing report	Supporting doc	✓ Accepted directly
Available 24/7	✓ Always on	✗ Scheduled only
Re-scans after fixes	✓ Per session	✗ Paid per engagement

Free Smart Contract Audit — Frequently Asked Questions

Is the free smart contract audit really free?

Yes — the first scan is completely free and requires no account. Paste your Solidity, Vyper, or Rust code and get AI-powered vulnerability analysis in under 60 seconds. The free tier processes one contract per session. Creating a free account gives you 5 scans per month. Paid plans (from $100/month) give 150–250 scans per month with full report export for exchange listing packages.

How does AI auditing compare to a manual audit from a firm like Trail of Bits?

AI auditing and manual auditing are complementary, not competing. AI excels at coverage breadth across known vulnerability patterns — it catches reentrancy, access control failures, integer overflow, oracle manipulation, and proxy storage collisions faster and cheaper than any human team. Manual auditors excel at novel logic bugs — business logic errors, economic attack paths specific to your protocol's design, and cross-protocol interactions. The recommended workflow: AI scans throughout development to fix the known issues, then engage a manual firm for final pre-launch review so their hours are spent on logic analysis, not basic pattern matching.

What programming languages does the free audit support?

Solidity (EVM chains: Ethereum, Base, Polygon, Arbitrum, Avalanche, BNB Chain), Vyper (Python-syntax EVM contracts), and Rust (Solana Anchor programs). For Sui Move, Cairo (StarkNet), and TON FunC/Tact contracts, paste the code and the analysis engine will process chain-specific patterns.

What does the free audit NOT cover?

The free AI audit focuses on smart contract code. It does not cover off-chain infrastructure (hot wallet key management, oracle signer security, API endpoint security) — which was the attack surface in the Ostium ($23.75M, July 2026) and Triple-A ($11.8M, July 2026) hacks. It also does not cover social engineering, team background, or governance token distribution. For a full-stack security review, use the AI audit for contract-level coverage and a specialized penetration testing firm for off-chain infrastructure.

Can I use the free audit report for an exchange listing or investor due diligence?

The free scan report documents the security state of your contracts. For exchange listings (Coinbase, Binance, OKX) and institutional investors, a report from a named audit firm is typically required in addition to AI analysis. The recommended approach: run AI scans to fix all flagged vulnerabilities, then engage a recognized firm for the final named report. Starting with AI analysis typically reduces manual audit costs because the easy findings are already fixed before the firm begins.

Written by Duron Epps, Founder of SmartContractAuditor.ai · Last updated July 2026

Audit Pricing Guide·Audit Companies·Reentrancy Attacks·Access Control Flaws·DeFi Audit