Let an AI coding platform refactor real code
Try a genuine refactor task on existing code, ideally with test coverage already in place.
REFACTOR SAFETY SCORE
Refactor Bench
Enter what happened when an AI coding platform refactored your existing code and get a computed refactor-safety score.
- Uses your inputs in a transparent calculation
- Instant result with practical next steps
- No signup required
Planning guidance only. Validate important decisions with customer evidence and your delivery team.
YOUR INPUTS
Build your result
Complete every field. The result updates only when you choose Calculate.
How it works
Record what actually happened
Regressions found, whether existing tests still passed, manual fix time needed, and whether behavior was preserved.
Get a size-normalized safety score
Regressions and fix time are normalized per 100 lines refactored, so a small change isn't unfairly compared to a large one.
Continue learning: After vibe-coding your MVP · AI-built prototype vs professionally engineered MVP
Frequently asked questions
Does Refactor Bench run the refactor itself?
No. You run the refactor with your chosen AI coding platform and enter the results — regressions, test outcomes, fix time, behavior drift. Refactor Bench computes a safety score from those inputs; it has no independent access to your code or the platform's behavior.
Why normalize by codebase size?
A refactor across 500 lines naturally risks more regressions than one across 20 lines. Normalizing regressions and fix time per 100 lines lets you compare refactor safety across differently sized tasks fairly.
What if I don't have tests to check against?
You can still score the refactor on regressions you manually spot and behavior changes you observe, but the result is less reliable without a test suite to catch subtle regressions — consider that a limitation of the input, not the tool.
How is this different from Code Quality Arena?
Code Quality Arena scores the general engineering quality of newly generated code (duplication, naming, tests). Refactor Bench scores a specific refactor attempt on existing code for safety — whether it broke anything, not how it's structured.
How We Compare
| Feature | MVPHub | manual code review | regression test suites (Jest/Pytest reports) |
|---|---|---|---|
| Structured refactor-safety scoring from your own results | Included | Limited | Not included |
| Size-normalized comparison across refactors | Included | Not included | Not included |
| Automated regression detection during the refactor | Not included | Not included | Included |
| CI-integrated automatic test execution | Not included | Not included | Included |
A regression test suite automatically detects broken behavior during CI; manual review relies on a person reading the diff. Refactor Bench doesn't replace either — it's a fast way to score and compare what you already observed from testing or review.
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