Smart Contract Auditor

Perform a preliminary static analysis on your Solidity code to detect common vulnerabilities like Reentrancy, Overflow, and Logic Errors.

Audit Report

Security Score

0 Critical

0 High

0 Medium

0 Low

Run an audit to see vulnerability findings here.

How to Audit Smart Contracts: A Guide for Developers

Smart contract security is paramount in the blockchain ecosystem. Unlike traditional software, smart contracts are immutable once deployed; a single bug can lead to the irreversible loss of millions of dollars. A Smart Contract Auditor tool performs "static analysis"—scanning the code for known patterns that indicate security risks before you even run the code.

Understanding Static Analysis

Static analysis involves examining the source code without executing it. This tool parses your Solidity code line-by-line using Regular Expressions (Regex) to identify specific syntax patterns associated with vulnerabilities. While it cannot replace a manual audit by a human expert, it serves as an excellent first line of defense to catch low-hanging fruit.

Common Vulnerabilities Detected

This tool checks for several critical issues:

Reentrancy (Critical): Occurs when a contract calls an external contract before updating its own state. The external contract can recursively call back into the original function, draining funds. This was the cause of the infamous DAO hack.
Tx.Origin (High): Using tx.origin for authorization is insecure because it references the original sender of the transaction chain, allowing malicious contracts to spoof authorization via phishing attacks.
Integer Overflow (High): In Solidity versions prior to 0.8.0, arithmetic operations could wrap around (overflow/underflow) if not checked using libraries like SafeMath.
Unchecked Low-Level Calls (Medium): Functions like call(), send(), and delegatecall() return a boolean success value. If this value is not checked, the transaction may fail silently while the contract assumes it succeeded.

Manual Review vs. Automated Tools

Automated tools are fast and consistent, but they lack context. They might flag a "Timestamp Dependence" warning for a non-critical event like a lottery draw date, which might be acceptable in your specific use case. Conversely, they might miss complex logical errors, such as a flawed economic model or incorrect access control logic. Always use this tool as a helper, not a final guarantee of security.