Free Alternative to Postman

Bruno completely rethinks how API collections should be stored. Instead of hiding requests in a proprietary cloud, Bruno v4.0.0 (23 July 2026) defaults to OpenCollection YAML on disk—commit them beside your code. I pointed Bruno at a folder in my repo on an M3 MacBook Pro; adding a POST created a text file I could git-diff. Cold start stays snappy. Native AI, typed variables, and a rebuilt secrets manager landed in v4 without forcing a Postman account. You will rewrite Postman pm.* scripts. There are still no hosted mocks. For teams that already live in Git, that trade is correct.

Hoppscotch started as a web application called Postwoman. It remains the absolute fastest way to test an endpoint on a machine where you lack install privileges. You just open a browser tab and start firing requests. They recently released a native Mac app built with Tauri. It runs significantly lighter than Electron-based competitors. I tested a workspace with 150 endpoints. The UI never stuttered. Hoppscotch supports real-time protocols like WebSockets and Server-Sent Events beautifully. The interface is visually stunning. It matches Apple's design language better than almost anything else here. The desktop app is still catching up to the web version in stability. I experienced two hard crashes while importing a 12MB Postman collection.

Insomnia has a complicated history. It spent years as the preferred local alternative to Postman. Kong acquired it. In version 8.0, they required a cloud account to use the app. The community backlash was immediate and brutal. Kong eventually walked back the requirement and introduced Local Vaults. I tested version 8.6 last week. It remains an excellent piece of software for GraphQL. The auto-complete for GraphQL queries is lightning fast. Environment variable management is highly intuitive. The app does heavily push you toward their paid enterprise features. You will see prompts for cloud sync. If you can ignore the upsells, the core request engine is incredibly solid.

HTTPie started out as a command-line alternative to cURL. They eventually built a desktop application. The GUI is aggressively minimalist. It looks like a blank canvas. You type a URL. The app infers the method and headers based on your input. I love how it formats JSON responses with beautiful syntax highlighting. It feels like typing in a modern text editor. The desktop app lacks advanced features. You cannot run complex test suites. There is no automated runner. It exists purely for manual exploration. If you just want to hit an endpoint and read the response without clicking through five different tabs, this is the tool to use.

Thunder Client is a VS Code extension. It brings the API testing interface directly into your editor. I found this incredibly useful when writing Express route handlers. I split my screen. I put my code on the left and Thunder Client on the right. I never had to switch contexts to test my work. The developer recently moved some advanced features behind a paywall. The free tier still handles basic REST requests and environment variables perfectly. It struggles with massive payloads. I tried loading a 5MB JSON response and the VS Code window locked up for ten seconds. It is perfect for quick checks but struggles with heavy lifting.

This is another VS Code extension. It strips away the GUI completely. You create a file with an .http extension. You type 'GET https://api.example.com' and a small Send Request button appears directly above the text. I use this constantly for quick scripts. It supports environment variables and basic authentication. You store the files in your repository. Everyone on your team can read them without installing a dedicated client. It requires you to memorize the exact syntax for headers and multipart form data. There are no visual builders to help you construct complex payloads. You are entirely on your own.

Yaak is a newcomer. The developer is building it entirely in Rust using the Tauri framework. The stated goal is absolute maximum performance. It delivers. I launched Yaak and it opened instantly. It uses almost zero background CPU. The application imports Postman and Insomnia collections flawlessly. It currently supports REST and GraphQL. The feature set is very raw. You will not find automated testing, mock servers, or complex scripting capabilities. It is a strictly manual testing tool right now. The developer ships updates almost every week. I am watching this project closely. It feels like what Postman used to be ten years ago.

Milkman is a Java-based application. It feels like it was designed by backend engineers for backend engineers. The interface is completely modular. You only load the plugins you actually need. I installed the core app and the gRPC plugin. It handled bidirectional streaming better than Postman ever did. The UI looks terribly outdated. It resembles an Eclipse IDE from 2012. You have to rely on unofficial binaries for Apple Silicon. If you deal with obscure protocols or need highly specific custom behavior, Milkman offers unparalleled flexibility. It ignores aesthetics completely in favor of raw protocol support.