DiffFence reads your diff, generates tests, runs them on both branches, and tells you exactly what broke. One command.
Reads your PR diff and infers what changed, why it changed, and what could break.
Creates targeted test scenarios for each changed function. No boilerplate, no maintenance.
Tests are generated on the fly and discarded after use. Nothing to commit, nothing to maintain.
New tests generated automatically as your code evolves. No stale test suites.
Strips type errors, flaky assertions, and import failures. Only real behavioral changes surface.
Wrong expected value? DiffFence reads the error, fixes the test, and re-runs automatically.
Results in seconds, not the minutes of full E2E suites. Runs on both branches in parallel.
Finds bugs that existed before your PR. Flagged separately so they never block your merge.
Every failure includes the exact code path, file, and line that caused the regression.
Each finding includes a confidence percentage so you know which bugs to fix first.
Shows blast radius — how many code paths and downstream functions are affected.
Auto-posts review comments directly on your pull request with bug details and suggested fixes.
No tiers. No credits. No confusion.
Everything included. Pay only when DiffFence runs.
Be first in line. Limited early access spots.
Bigger PR? Split it — it's better engineering anyway.
Need more? Contact us for enterprise.
Be the first to catch bugs before they ship. Limited early access spots.