CodiumAI
What it is: AI that writes meaningful tests. Analyzes code behavior, generates test cases. VS Code and JetBrains integration.
What It Does Best
Test suggestions. Analyzes your function, suggests edge cases you missed. "What if input is null? Empty array? Negative number?"
Actual test code. Doesn't just tell you what to test. Writes full test cases in your testing framework. Jest, Pytest, JUnit.
Understands intent. Reads docstrings and code context. Tests what function should do, not just what it currently does.
Pricing
Free: Individual developers
Teams: $19/user/month
Enterprise: Custom pricing
When to Use It
✅ Low test coverage needs improvement
✅ Writing tests feels tedious
✅ Keep missing edge cases
✅ Working on critical code that needs thorough testing
When NOT to Use It
❌ Already at 100% coverage (rare but happens)
❌ Tests are trivial (simple getters/setters)
❌ Don't trust AI-generated tests without review
Bottom line: Makes testing less painful. Won't replace good testing practices but helps you think of cases you'd miss. Free tier is generous.