The best HTTP Client alternative to Fiddler is HTTP Toolkit, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Fiddler and 11 are HTTP Clients so hopefully you can find a suitable replacement. Other interesting HTTP Client alternatives to Fiddler are Proxyman, Requestly, HttpMaster and Advanced REST Client.
HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools and automatic interception for clients from Docker to Android to iOS.
Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains. Available on macOS, iOS, Windows & Linux.
Requestly is a lightweight proxy available as a browser extension & desktop app to intercept & modify network requests. Using Requestly you can Modify Headers, Redirect Url, Mock API response, Delay/Throttle requests, etc.
Practical and easy-to-use software tool for testing HTTP applications and services.
API testing tool. Which allows web developers to create and test custom HTTP requests.
Design and debug APIs in a powerful visual editor. Describe and debug easily with JSON Schema support. Apidog is a complete set of tools that connects the entire API lifecycle, helping R&D teams implement best practices for API Design-first development.
Working quietly on the Menubar, Surge is a high-performance HTTP/SOCKS5 proxy server. It is capable of intercepting and logging the summary of HTTP traffic, and meanwhile transmitting the traffic to other proxy servers according to the flexible rule system.
ArdorQuery is a cross-platform tool for performing any HTTP(S) endpoints like REST API, HTML, Images, GraphQL, OData etc.
API Tester is the first mobile app to test any type of API on the go. Test REST, GraphQL, WebSocket, SOAP, JSON RPC, XML, HTTP, and HTTPS APIs completely for free, on iOS or Android.
Modern HTTP debugging tool, Debug, mock, and rewrite HTTP/HTTPS traffic with composable rules.
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Fiddler is for super-user, and unfriendly for newbie. Proxyman is designed by strictly following the macOS human guideline from Apple, so it feels like the home.