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Solidity Auditor

What it does

Analyzes Solidity smart contracts for security vulnerabilities, gas optimization and best practices.

Smart contracts handle millions in value, but most teams lack the expertise to detect critical vulnerabilities before deployment

Security flaws in smart contracts have led to losses of over 3 billion dollars in recent years alone. Reentrancy attacks, flash loan exploits, oracle manipulation and access control bugs are just some of the threats lurking in seemingly correct code. Professional security audits cost $5,000-$50,000 and take weeks to complete, causing many projects to skip this critical step. Even teams with experienced developers miss subtle vulnerabilities because Solidity has unique security patterns that differ fundamentally from traditional programming.

• Reentrancy attacks exploit the order of operations in the contract — a seemingly innocent external call can let an attacker drain the contract before the balance is updated, something extremely difficult to detect through manual review
• Flash loan attacks combine borrowing, manipulation and repayment in a single transaction — the attacker needs zero capital and can exploit price differences, governance votes or liquidity pools in milliseconds
• Oracle manipulation lets attackers feed the contract false price data — if the contract relies on a single price source the attacker can manipulate it and trigger liquidations, incorrect payouts or other economic damage
• Access control bugs like missing modifiers, errors in onlyOwner checks or incorrect use of tx.origin instead of msg.sender can give anyone administrator access to the contract

AI-powered security auditor that scans Solidity code for vulnerabilities, gas optimization and best practices — in seconds instead of weeks

Solidity Auditor analyzes your smart contract code with advanced pattern recognition and static analysis to identify security vulnerabilities, gas optimization opportunities and deviations from best practices. The tool checks for over 150 known vulnerability patterns including reentrancy, integer overflow, front-running, oracle manipulation and access control bugs. You get a detailed report with severity level, explanation and concrete code suggestions to fix each issue.

• Comprehensive vulnerability scanning: checks for 150+ known attack patterns including reentrancy, flash loan vectors, oracle manipulation, front-running, integer overflow and delegatecall abuse — with detailed explanation of each threat
• Gas optimization analysis: identifies inefficient code that costs users unnecessarily high transaction fees — suggests concrete optimizations like variable packing, calldata usage and loop efficiency improvements
• Best practices check: verifies that the code follows OpenZeppelin standards, uses correct modifiers, handles errors properly and implements events for all important state changes
• Concrete fix suggestions: each identified vulnerability comes with an explanation of the risk, a code example showing the problem and a concrete code suggestion to fix it — ready to implement directly

Features

• Reentrancy detector: identifies all external calls that happen before state updates and suggests checks-effects-interactions pattern or ReentrancyGuard — covers both direct and cross-function reentrancy
• Flash loan analysis: evaluates whether the contract's functions can be exploited through flash loans by checking price dependencies, governance mechanisms and liquidity operations in a single transaction
• Access control audit: maps all functions with and without access restrictions, identifies missing modifiers and verifies that roles and permissions are correctly implemented
• Automatic severity classification: categorizes findings as critical, high, medium, low or informational based on potential economic damage, exploitability and likelihood of attack

How it works

1. Paste your Solidity code or upload .sol files — the tool parses the contract, builds an abstract syntax tree and maps all functions, variables, modifiers and external dependencies
2. Solidity Auditor runs 150+ security checks against your code, analyzes control flow and data flow, and identifies patterns matching known vulnerabilities — from simple access control bugs to complex economic attacks
3. You get a prioritized report with all findings sorted by severity, each with detailed explanation, code example and concrete fix suggestion — plus an overall security score and recommendations for further audit

Use cases

• DeFi projects preparing for mainnet deployment — run an automatic security check before sending the code to a professional auditor, so you fix the obvious issues first and save time and money on the formal audit
• Developer teams wanting to integrate security scanning in their CI/CD pipeline — run Solidity Auditor automatically on every pull request to catch vulnerabilities early in the development process before they reach production
• Investors and DAO members wanting to evaluate a protocol's security before investing — get a quick overview of potential risks without waiting for a full professional audit

Why use Solidity Auditor?

Security in smart contracts is not optional — it's existential. A single overlooked vulnerability can lead to total loss of all funds in the contract, and there's no "undo" button on the blockchain. Solidity Auditor gives you an automated safety net that catches the most common and dangerous vulnerabilities before they reach production.

The tool is especially valuable as part of the development process, not just as a one-time check before deployment. By integrating security checking into the daily workflow you catch vulnerabilities when they're introduced — when they're cheapest and easiest to fix. A vulnerability discovered during development takes minutes to fix; the same vulnerability discovered after deployment can cost millions.

For projects planning a professional security audit, Solidity Auditor significantly reduces costs. Professional auditors spend a lot of time finding and reporting basic issues that automated tools can easily detect. By fixing these first you get more value from the expensive human audit — the auditor can focus on the complex, protocol-specific risks that require deep expertise.

FAQ

Can this replace a professional security audit?

No, Solidity Auditor is designed as a first line of defense and supplement to professional audits — not a replacement. The tool catches most known vulnerability patterns, but complex economic attacks, business logic errors and protocol-specific risks require human expertise. We recommend using the tool to fix obvious issues first, then sending the improved code to a professional auditor.

What types of vulnerabilities does the tool detect?

The tool checks for over 150 known vulnerability patterns including reentrancy (direct and cross-function), integer overflow/underflow, front-running, oracle manipulation, flash loan vectors, delegatecall abuse, access control bugs, unchecked external calls, timestamp dependencies and many more. The checklist is continuously updated based on new attacks and vulnerabilities discovered.

Does the tool support Vyper or other languages?

Currently the tool only supports Solidity, which is by far the most used language for smart contracts. Support for Vyper and other EVM-compatible languages is planned for future updates.

How long does an analysis take?

Most contracts are analyzed in under 30 seconds. Very large contracts or projects with many dependencies may take up to a couple of minutes. This is dramatically faster than a manual audit which typically takes 2-4 weeks.

Try Solidity Auditor free