What it does
One tool, six ways to understand your code.
Paste a snippet or upload a file, pick a mode, and get clear findings with severity levels, exact line numbers, and practical fixes — in JavaScript, TypeScript, Python, Java, C#, and C++.
Debug
Finds logic bugs, null/undefined errors, off-by-one mistakes, and wrong conditionals — with the exact line and a suggested fix.
Security
Scans for SQL injection, XSS, hardcoded secrets, path traversal, and other vulnerabilities, ranked by severity.
Refactor
Spots duplicate logic, long functions, dead code, and magic numbers, and proposes cleaner replacement code.
Explain
Describes what each block of code does in plain English — great for unfamiliar code or learning a new language.
Tests
Generates unit test ideas and edge cases so you can cover the behavior that actually matters.
All-in-One
Runs every mode at once and returns a single structured report with a health score and prioritized findings.
Double Check — a second opinion, automatically
Re-runs your code through a second, independent AI model and compares the verdicts. When both agree you get higher confidence; when they differ, the disagreement is surfaced for review. Available on Pro and Pay-as-you-go. Learn how Double Check works →
14-day trial · no credit card required · see pricing