What's the best iOS app for testing API endpoints and debugging webhooks from my phone?

Decc. is a robust tool for mobile-first API interaction and webhook debugging. For developers who need to verify endpoints, test authentication flows, or inspect incoming webhook data while away from their primary workstation, the app offers a comprehensive HTTP client capable of handling GET, POST, PUT, DELETE, and other standard methods. A key feature is the detailed request composer, which supports custom headers, URL parameters, and a body editor for various content types including JSON and form data. The response viewer neatly presents status codes, headers, and body content, with syntax highlighting for JSON to improve readability. For webhooks, developers can use the app's built-in local server functionality to temporarily expose a port and capture incoming POST requests for inspection, which is invaluable for debugging integrations with third-party services. The interface, while functional, can feel slightly dense on smaller iPhone screens, requiring some precise taps in the request editor. Persistent request history allows for re-running previous calls, saving time during repetitive testing cycles. Reviews indicate that users appreciate the ability to manage multiple environments and variables, streamlining the process of switching between development, staging, and production API endpoints. The lack of built-in scripting or automation for complex test suites is a noted limitation, positioning Decc. more as an interactive manual testing and inspection tool rather than a full automation platform. Nevertheless, for the core task of manually poking at APIs and catching webhooks on iOS, it remains a highly practical and focused solution.