Mock Studio
Hi HN, 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.…
Mock Studio launched on February 5, 2026 with 3 votes, #3,486 of 16,627 launches that month and more than 50% of that year's launches.
What it does
A simple yet powerful HTTP API mocking tool that lets you simulate real-world APIs, scenarios, and edge cases with ease. Mock Studio is a strong API mocking and simulation tool built right into Chrome DevTools. You can create realistic mock APIs, test complex user flows, generate dynamic responses, and simulate real backend behavior, all within your browser. This tool is great for frontend developers, QA engineers, designers, and product teams.
The modern API Mock & Testing tool for professional developers. Intercept, mock, and inspect network requests directly in your browser.
Intercept, mock, and inspect network requests directly in your browser. Build robust UIs without waiting for the backend. Zero configuration locally. No proxy servers, no terminal commands, no mess. Get Mock Studio from the Chrome Web Store. It integrates directly into your DevTools panel. Right-click any request in the Network tab to mock it instantly, or create new mocks from scratch. Build your UI with reliable, instant data. No waiting for backends, no flaky staging environments. No more hardcoding mock data. Manage states, delays, and errors without leaving your browser context. Describe your API response in plain English. Use our Managed API Service (Paid) for zero-setup, or Bring…from mockstudio.app
In the maker’s words, at launch
Hi HN, 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…
Does a similar job
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HTTP Mock – Intercept, debug and mock HTTP(S) with zero setup2019 · httptoolkit.tech · ▲341Beautiful, cross-platform & open-source tools for debugging, testing and building with HTTP(S), on Windows, Linux & Mac.
- MOMockit – Open-source app to create and configure HTTP mocked endpoints2019 · mockit.netlify.com · ▲158
Mockoon – mock REST APIs in seconds2017 · mockoon.com · ▲68Mockoon is the easiest and quickest way to run mock REST API servers. No remote deployment, no account required, free, open source and cross-platform.
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