Launched January 6, 2026
tweak extension
Instantly mock, modify, and master your APIs-right in your browser. Build, test, and demo faster than ever
FreeWorkflow automationQABrowser Extension523 impressions#877 of its week
Supercharge your web development workflow with Tweak-the all-in-one browser extension that lets you mock, modify, and debug HTTP requests in seconds. Whether you’re building, testing, or demoing an application, Tweak empowers you to create and control API responses on the fly-no backend required.
Instant Setup: Launch your own mock server and start intercepting requests in just a few clicks. No complex configuration, no code needed-just pure productivity.
Total Flexibility: Seamlessly mock and modify requests across any environment, from local development to live production. Instantly replicate edge cases or test new features-even if the backend isn’t ready.
Effortless Collaboration: Demo your frontend with custom data, showcase features before the backend is finished, and accelerate feedback cycles with real-time API tweaks.
Enhanced Security: Perform penetration tests and simulate malformed data to bulletproof your web app-all within your browser.
Always in Control: Set rules, capture and edit requests, and update responses anytime. With Tweak, you’re never waiting on backend changes again.
Tweak is the essential toolkit for modern developers who want to move fast, test smarter, and deliver with confidence. Try it now and experience seamless API mocking, powerful debugging, and instant prototyping-right in your browser.
Tweak is a browser extension that lets you mock, modify, and debug HTTP requests directly in the browser.
- for
- Web developers who need fast API mocking and debugging without a backend.
- pricing
- freemium · free trial
works withChromeEdge
Key features
8 features of tweak extension
- Rule-based request capture — Define rules to intercept, rewrite, or mock HTTP requests on the fly.
- Custom response editing — Edit status code, headers, body and add delays, including streaming chunk delays.
- JavaScript response hooks — Run custom JS snippets to transform responses dynamically (Premium).
- Collections & import/export — Organize rules into folders and share them across devices or teams.
- HAR & cURL imports — Convert network traffic or cURL commands into ready-to-use mock rules.
- Partial payload matching — Match requests by specific fields in the body, not just the URL.
- Random data generators — Generate realistic test data such as names, emails, dates, and IDs.
- Floating window mode — Detach the UI into a resizable window or tab for side-by-side work.
Use cases
- Mock backend APIs during early frontend development.
- Test edge-case error handling by returning custom status codes.
- Demo new UI features with realistic data before the server is ready.
- Perform penetration testing by sending malformed responses.
- Share a set of mock rules with a teammate for consistent testing.
tweak extension pricing
- Free$0/yearUp to 12 mock rules · Auto-enabled sites · Header rewrite · Redirects
- Premium$36/year/yearUnlimited rules · Custom JavaScript hooks · Collections · Priority email support
tweak extension vs alternatives
| Best for | In-browser API mocking and debugging | Full-featured API client | Integration & security testing | No-code workflow automation | Automation pipelines |
|---|---|---|---|---|---|
| Pricing | Freemium | Subscription | Subscription | Subscription | Subscription |
| DevHunt upvotes | 0 | 14 | 12 | 0 | 0 |
| Launched | Jan 2026 | Jul 2025 | Jul 2026 | — | — |
- tweak extension vs Fusion: A modern API Client: Build, Test, Document and Collaborate on APIs.: Focuses on API design, testing and documentation rather than in-browser request interception.
- tweak extension vs VirtuProbe Studio: Provides a cross-protocol request workbench for integration and penetration testing, not a browser extension.
- tweak extension vs Zapier: Automates workflows across many services; does not mock HTTP requests within the browser.
- tweak extension vs n8n: Visual workflow automation platform, unrelated to API mocking inside the browser.
tweak extension FAQ
Is there a free trial?+
Yes, the Premium plan includes a 7-day free trial.
How many devices can I use Tweak on?+
One device per subscription; additional devices require another subscription.
Can I transfer my subscription to another email?+
No, you must cancel the current subscription and create a new one with the desired email.
What payment methods are accepted?+
Cards, PayPal, Apple Pay, and Google Pay via Paddle.
How do I move my subscription to a new computer?+
Sign out on the old computer and sign in on the new one; you can move it up to three times per month.
Summarized by DevHunt from tweak-extension.com · Oct 8, 2026. Details may change; check the official site.