The Complete
API Development Ecosystem
A suite of powerful, local-first tools to build, test, and debug APIs faster. Open source, private, and designed for developers. 100% Local & Private by Design.
Our Products
Specialized tools designed to make your API development workflow faster, safer, and more efficient.
API Interceptor, Mocker and Tester
The all-in-one browser extension for developers. Intercept, mock, and test HTTP requests directly in your browser. Simulate network conditions, inject headers, and prototype APIs without backend code. Master your API workflow today.
The Ultimate Tool for API Development
Real-time Interception
Capture HTTP/HTTPS requests and responses in real-time. Analyze headers, payloads, and timing details instantly.
Instant Response Mocking
Mock API responses locally without backend changes. Test edge cases, error states, and loading conditions effortlessly.
Modify & Replay
Edit request headers, body, and query parameters on the fly. Replay failed requests to debug complex workflows.
100% Local Privacy
Your data never leaves your browser. All mocked data and captured requests are stored locally using IndexedDB.
Simple Pricing
Start free, upgrade anytime. 7-day money-back guarantee.
Free
Best for individual developers looking to explore API development
API Interceptor, Mocker and Tester →
- Quick API Tester
- Code Snippet Generation
- Environment Variables
- Export Interceptor Rules
- Use Website's Cookies in API Test Calls
Limits
- Max Interceptor Rules3
- Max API Tester History20
- Max Browsers1
- Max Saved API Calls5