Ship more.
Break less.
Thoroughly test your vibe-coded app without writing test code. Verify every new feature, rerun the journeys that already work, and catch regressions before your users do.
No test scripts. No QA team required. Real-browser evidence included.
Describe your test
“Log in, add the Pro plan to checkout, pay with a test card, and verify the success screen appears.”
Pull request #128
12 of 12 journeys passed
The short answer
What is Diffie?
Diffie is an AI end-to-end testing app. Describe critical user journeys in plain English; Diffie generates and executes the browser tests, returns pass/fail evidence with video, and can run the suite on every pull request to catch functional regressions.
AI made building fast.
Testing should keep up.
The hard part is no longer writing the feature. It is knowing the new code works and did not quietly break something your users already rely on.
You ship a new feature in hours
AI helps you move from idea to working code faster than a manual QA process can follow.
Old flows break in silence
A small change to auth, checkout, or navigation can create a regression somewhere else.
Every PR earns confidence
Test the new behavior, rerun your saved journeys, and review clear evidence before release.
One simple loop
From “I think it works” to proof it works.
01
Describe what should work
Write the user journey in plain English, just as you would explain it to another person.
02
Watch Diffie test it
Diffie opens your app in a real browser, performs every step, and verifies the outcome.
03
Keep it working
Add the test to your suite and run it on every pull request to catch regressions before release.
Complete release confidence
Test what is new.
Protect what already works.
Verify the thing you just built
Turn your feature's acceptance criteria into a browser test and see the entire journey run before you release it.
- ✓Write the expected behavior in plain English
- ✓Exercise the complete user journey in a real browser
- ✓Review pass/fail results and video evidence
Make sure the rest still works
Keep every proven journey in one suite and rerun it when your code changes, so old features stay protected while you add new ones.
- ✓Run your existing suite on every pull request
- ✓Catch functional regressions before deployment
- ✓See exactly where and how a journey failed
Evidence, not another black box
Watch the test run for yourself.
Diffie shows the browser in action and records every run. When a test fails, you can replay what happened and move straight to the fix.
Learn how Diffie worksFrequently asked questions
Simple answers before you start.
What is Diffie for vibe coders?+
Diffie is an AI end-to-end testing app. You describe critical user journeys in plain English, and Diffie turns them into browser tests, runs them, and returns pass/fail evidence with video.
Can Diffie test a new feature I just built?+
Yes. Describe how a user should use the feature and what successful behavior looks like. Diffie runs that journey in a real browser so you can verify the feature before you ship it.
Can Diffie catch regressions on every pull request?+
Yes. Once your critical journeys are saved as a test suite, you can run the suite in CI on every pull request. That checks whether features that worked before still work after the latest change.
Do I need to write test code or know a test framework?+
No. Diffie tests are written in plain English. You do not need to write Playwright scripts, maintain selectors, or learn a test automation framework to create and run browser tests.
What evidence do I get after a test run?+
Diffie returns a clear pass or fail result and a video replay of the browser run, so you can see what happened instead of guessing from a test log alone.
