KeelTest
AI-driven VS Code unit test generator with bug discovery
Details
- External ID
- 46526088
- Source
- HN
- Company
- —
- Product
- KeelTest
- Website domain
- keelcode.dev
- Launched
- Jan. 7, 2026
- Cohort
- —
- Upvotes
- 30
- Upvotes percentile
- 0.7134387351778656
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:25 p.m.
- Updated at
- Sept. 7, 2026, 9:25 p.m.
Description
I built this because Cursor, Claude Code and other agentic AI tools kept giving me tests that looked fine but failed when I ran them. Or worse - I'd ask the agent to run them and it would start looping: fix tests, those fail, then it starts "fixing" my code so tests pass, or just deletes assertions so they "pass".Out of that frustration I built KeelTest - a VS Code extension that generates pytest tests and executes them, got hooked and decided to push this project forward... When tests fail, it tries to figure out why:- Generation error: Attemps to fix it automatically, then tries again- Bug in your source code: flags it and explains what's wrongHow it works:- Static analysis to map dependencies, patterns, services to mock.- Generate a plan for each function and what edge cases to cover- Generate those tests- Execute in "sandbox"- Self-heal failures or flag source bugsPython + pytest only for now. Alpha stage - not all codebases work reliably. But testing on personal projects and a few production apps at work, it's been consistently decent. Works best on simpler applications, sometimes glitches on monorepos setups. Supports Poetry/UV/plain pip setups.Install from VS Code marketplace: https://marketplace.visualstudio.com/items?itemName=KeelCode...More detailed writeup how it works: https://keelcode.dev/blog/introducing-keeltestFree tier is 7 tests files/month (current limit is <=300 source LOC). To make it easier to try without signing up, giving away a few API keys (they have shared ~30 test files generation quota):KEY-1: tgai_jHOEgOfpMJ_mrtNgSQ6iKKKXFm1RQ7FJOkI0a7LJiWgKEY-2: tgai_NlSZN-4yRYZ15g5SAbDb0V0DRMfVw-bcEIOuzbycip0KEY-3: tgai_kiiSIikrBZothZYqQ76V6zNbb2Qv-o6qiZjYZjeaczcKEY-4: tgai_JBfSV_4w-87bZHpJYX0zLQ8kJfFrzas4dzj0vu31K5EWould love your honest feedback where this could go next, and on which setups it failed, how it failed, it has quite verbose debug output at this stage!
Enrichment
- Theme
- AI agent frameworks and developer tools
- Vertical
- —
- Function
- Agent / copilot
- Audience
- Developer
- AI stance
- AI-native
- Project type
- Commercial product
- Normalized one-liner
- ai unit test generator for vs code
- Manually corrected
- False
Could you build this?
Yes This is a VS Code extension that interacts with language servers and test runners, passing test failure outputs back into an LLM prompt with strict system instructions.
Discussion
15 comments analyzed.
Competitors mentioned: Microsoft Copilot, Cursor, Claude Code, Codex, mutation testing
Concerns raised: Non-scalable approach, Generates unnecessary/boilerplate tests that don't add value, LLMs hallucinate and assume behavior not in source code, Difficulty determining if test failure is bug vs test design issue, Generated tests pass but fail for wrong reasons when manually broken
Feature requests: Support for larger files beyond 15 functions, Negative/error case test generation, Generated test annotations and justifications, Design doc context to reduce hallucinations, Language/framework-specific test requirements tuning
Competitors
Other products that read as similar to this one — 253 launches clear the similarity bar, closest 8 shown.
Attention rank: #87 of 254 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 69 days after the earliest competitor.
- Detail, a Bug Finder · hn · 2025-12-09 · 67 upvotes · similarity 0.52
- Flakestorm · hn · 2026-01-05 · 6 upvotes · similarity 0.50
- Autofix Bot · hn · 2025-12-11 · 37 upvotes · similarity 0.46
- Canary (YC) · hn · 2026-09-24 · 8 upvotes · similarity 0.46
- FixBugs · hn · 2026-07-13 · 43 upvotes · similarity 0.45
- CodeLeash: framework for quality agent development, NOT an orchestrator · hn · 2026-02-27 · 12 upvotes · similarity 0.45
- Spec27 · hn · 2026-04-30 · 13 upvotes · similarity 0.45
- Automated Testing for AI Agents · hn · 2026-03-06 · 8 upvotes · similarity 0.44
Other launches for this product
- No other launches for this product.