I built this after using Requestly, Mokku, Mockiato, Tweak, and Mockoon. Each one either paywalled the features I actually needed, required a separate server running on my machine, or just didn't fit the way I work.

The browser is already open. DevTools is already open. I wanted the mocking to live there too, not in a separate app I have to remember to start.

So roughly a month ago, I started building my own tools. It intercepts network requests at the browser level and lets you swap the response, status code, headers, body without touching your code or spinning up anything. Right-click a in the Network tab, mock it, done. v1.0.3 is out now and it's been stable enough that I've been using it daily on client work for months.

A few things I care about that shaped the decisions:

- Local-first by default. Your mocks live in the browser's storage.

- The free tier is actually free. Unlimited mocks, unlimited projects, OpenAPI import, GitHub Sync, BYOK AI (OpenAI-compatible or local Ollama). No trial countdown, no credit card.

Currently it is only support Chromium-based browser. The things I'm still considering are supporting other browser also, such as Firefox, Opera, etc.

Extension: https://chromewebstore.google.com/detail/nilcfehohhhfjekckib...

If you've built something in this space or had opinions on why existing tools fell short, I genuinely curious.