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Best AI to write unit tests
One decision, not a directory. Pricing checked 2026-10-14.
Cursor
AI-first code editor with agentic coding.
Free tierFree tier; paid plans from $8/moCoding
Claude Code
Terminal-based agentic coding tool from Anthropic.
PaidIncluded with Claude Pro ($20/mo) and Max plans, or via APICoding
- Open your project in Cursor and confirm your test framework runs (for example pytest or Jest).
- Select a function or file and ask the agent to write tests covering normal cases, edge cases and errors.
- Let it run the test command and fix failures; check that failing tests point to real bugs, not wrong expectations.
- Ask what is still untested, and add tests for the riskiest paths.
- Review the tests like any code before committing.
Why Cursor
Cursor sees your code and existing tests, so new tests follow your conventions and actually run.
When to choose Claude Code instead
Choose Claude Code if you prefer working from the terminal and want an agent that can run your suite and iterate on its own.
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Pricing at a glance
| Tool | Pricing | Free tier |
|---|---|---|
| Cursor | Free tier; paid plans from $8/mo | Yes |
| Claude Code | Included with Claude Pro ($20/mo) and Max plans, or via API | No |
| Claude | Free tier; Pro $20/mo ($17/mo billed annually) | Yes |
| Sudowrite | Paid from $10/mo; free trial, no card | No |
| Grammarly | Free plan; Pro $12/mo | Yes |
Pricing changes often; check the official site before buying.
FAQ
What is the best AI to write unit tests?
Our pick is Cursor: AI-first code editor with agentic coding. Pricing: Free tier; paid plans from $8/mo.
When should I choose Claude Code instead?
Choose Claude Code if you prefer working from the terminal and want an agent that can run your suite and iterate on its own.
Does Cursor have a free plan?
Yes. Cursor: Free tier; paid plans from $8/mo.