Build fast.
Break nothing.

Diffie is your AI test agent that turns plain English into browser tests. It runs them in the cloud, sends you the video, and alerts you when something breaks.

Move faster without worrying about breaking things.

Write tests in English, not code

Watch them run in real time.

Debug as you go, learn from failures.

Automate runs and focus on building, not babysitting.

Find out what features Diffie comes with

Write test in English

See the AI agent perform your test live in a real browser. You'll get a video replay of every run so you can see exactly what happened.

Watch It Run

See the AI agent perform your test live in a real browser. You'll get a video replay of every run so you can see exactly what happened.

Schedule and Automate

Set your tests to run automatically. As often as you want. Catch breakages before users ever notice.

Full Browser Automation

Diffie runs your app in a real browser. It logs everything that happens, giving you a full picture of what's going on inside your app.

History and Insights

Track all your test runs over time and gain insights into your application's stability and performance.

Notifications on Failure

Get instant alerts when tests fail so you can fix issues before they impact your users.

Why Diffie?

You're building faster than ever thanks to AI.

But speed brings fear — fear of breaking your app. Diffie removes that fear. It makes sure every feature that worked yesterday still works today. So you can push code without holding your breath.

Diffie doesn't just test your app. It protects your confidence.

Pricing

Free

50 Runs

Basic testing and browser videos

Developer

$29

/mo

Everything in Free +

500 Runs

Scheduling

Tests History

Notificaitons

Team

$99

/mo

Everything in Developer +

Unlimited Runs

Shared runs

Integrations

Support

Every plan includes English-to-code test authoring and browser video playback.

Founders' note

We built Diffie because we hit the same wall you're hitting now. We were coding faster with AI, running multiple agents in parallel, and it was thrilling — until we realized we were scared to deploy. We didn't know what we'd broken. Diffie was born from that fear. It's the testing agent we wished we had — the one that makes sure your app stays unbroken, no matter how fast you're moving.