Every PR reviewed.
Zero tests written.
Difffence reads your diff, generates tests, runs them on both branches, and tells you exactly what broke. One command.
Understand your diff, test what matters
- ◎
From code diffs
Reads your PR diff and infers what changed, why it changed, and what could break.
- ⚙
Auto-generates tests
Creates targeted test scenarios for each changed function. No boilerplate, no maintenance.
- ★
Zero maintenance
Tests are generated on the fly and discarded after use. Nothing to commit, nothing to maintain.
- ↺
Always up to date
New tests generated automatically as your code evolves. No stale test suites.
Find real bugs, filter the noise
- ✓
Multi-layer filtering
Strips type errors, flaky assertions, and import failures. Only real behavioral changes surface.
- ↻
Self-healing tests
Wrong expected value? Difffence reads the error, fixes the test, and re-runs automatically.
- ⚡
Fast feedback
Results in seconds, not the minutes of full E2E suites. Runs on both branches in parallel.
- ✕
Latent bug detection
Finds bugs that existed before your PR. Flagged separately so they never block your merge.
Every bug comes with a root cause
- 🔍
Root cause, not stack traces
Every failure includes the exact code path, file, and line that caused the regression.
- ⚖
Confidence scores
Each finding includes a confidence percentage so you know which bugs to fix first.
- 📈
Impact assessment
Shows blast radius — how many code paths and downstream functions are affected.
- 💬
Inline PR comments
Auto-posts review comments directly on your pull request with bug details and suggested fixes.
Simple pricing.
No tiers. No credits. No confusion.
Everything included. Pay only when Difffence runs.
- ✓
Up to 30 functions analyzed per PR
Covers even large pull requests
- ✓
Up to 200 lines per function
Full context for accurate analysis
- ✓
Auto-posts review comments on your PR
Inline comments with bug details and confidence scores
- ✓
Self-healing tests & noise filtering
Only real behavioral regressions surface
- ✓
Works with GitHub Actions
One-click GitHub App install. Zero config.
Be first in line. Limited early access spots.
Bigger PR? Split it — it's better engineering anyway.
Need more? Contact us for enterprise.
Join the Waitlist
Be the first to catch bugs before they ship. Limited early access spots.