Free, privacy-first API client built natively into VS Code. Test REST, GraphQL & WebSocket APIs locally — no login, no cloud sync, no telemetry.
United States
+1
Postman Alternatives
Postman is described as 'Collaborative platform for API development providing design, specifications, testing, documentation, and requests with free and paid subscription plans' and is a very popular API Client in the development category. There are more than 100 alternatives to Postman for a variety of platforms, including Windows, Mac, Linux, Web-based and SaaS apps. The best Postman alternative is Insomnia REST Client, which is both free and Open Source. Other great apps like Postman are NativeRest, Hoppscotch, HTTPie for Terminal and Bruno.
filter to find the best alternatives
Postman alternatives are mainly API Clients, but if you're looking for HTTP Clients or HTTP(S) Debuggers you can filter on that. Other popular filters include Linux, Web Development, Open Source, Online, Android, Mac and Windows. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Postman.
Alternatives list
Slingshot is a web-based HTTP request client that is highly performant, low on resources, privacy respecting, local-first, free and open-source. It stores all your data locally in your browser. It allows you to import and export OpenAPI specs and Postman collections.
Cost / License
- Freemium
- Open Source (AGPL-3.0)
Platforms
- Online
- Self-Hosted
Resonance is a local-first, zero-account API client application designed to provide an excellent user experience for testing and interacting with APIs. Built with Tauri, it offers a modern and intuitive interface for developers.
A fast, lightweight REST API client for developers. Test, debug, and organize your APIs locally without cloud sync. Free
Cost / License
- Free
- Proprietary
Platforms
- Windows
- Mac
Fast, offline-first REST API client for testing and debugging APIs — no account, no cloud, collections stored as plain JSON files on your disk.
APIBuilderHQ is a zero-friction alternative to heavy API clients like Postman. Built entirely for the browser — no desktop app, no mandatory accounts, no cloud sync. Your collections and request data stay in localStorage on your device.
A free AI interview that turns plain-English requirements into a build-ready manufacturing specification and flags what physics will not allow.
Cost / License
- Freemium
- Proprietary
Platforms
- Windows
- Mac
- Linux
+4
The trust layer for AI agents. Test, certify, and discover trusted AI agents built on Google's A2A protocol. 50+ automated compliance tests, trust scores, certification badges, and an agent directory.
APISpider is a lightweight API client for testing, debugging, and documenting REST APIs. It includes request history, collections, environment variables, mock servers, and API docs — all designed to keep your workflow fast and distraction-free.
A secure, local-first browser extension that packs essential developer utilities, JSON formatters, and JWT decoders directly into your toolbar.
Cost / License
- Free
- Proprietary
Platforms
- Online
- Google Chrome
AirMQTT is a native MQTT client that helps you monitor topics, publish messages, and manage multiple MQTT connections with a fast, focused workflow.
Cost / License
- Freemium
- Proprietary
Platforms
- Mac
- iPhone
- iPad
- Android
+4
Sweden
EU
Ecuador
India
