The difference between AI tools for test generation isn't just about code quality - it's about how the tool integrates into your actual workflow. A tool that generates excellent tests but requires copy-pasting between interfaces has a higher friction cost than a tool that generates acceptable tests directly in your editor. This roundup covers the free-tier options worth evaluating, what each is genuinely good at, and where each falls short for test generation specifically. Photo by Katerina Holmes on Pexels GitHub Copilot (Free Tier) GitHub Copilot is the most widely used AI coding assistant and has direct IDE integration. The free tier offers a limited number of completions per month. What it does well for tests: Inline completion makes test generation feel like typing. Write it('should return , and Copilot suggests test code based on the function visible in the file. For functions that are already in the same file or recently opened files, context is good.…