alternatives to
Hosted API platform with a desktop client for building and testing HTTP requests. A closed product from Postman.
| Tool | Fit | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|---|
| Hoppscotch | Full replacement | 81k | MIT | Open source | No | TypeScript | 2026.9.0 | 2026-10-04 |
| Bruno | Full replacement | 47k | MIT | Open source | No | JavaScript | v4.2.1 | 2026-10-06 |
| Yaak | Full replacement | 19k | MIT | Open source | No | TypeScript | v2026.8.1 | 2026-10-06 |
| Requestly | Full replacement | 6.8k | Other | Open source | No | Unknown | changelog-2026.03.23 | 2026-10-06 |
| Scalar | Partial | 16k | MIT | Open source | No | TypeScript | release-2026-10-05-df37703 | 2026-10-06 |
| Posting | Partial | 12k | Apache-2.0 | Open source | No | Python | 2.11.2 | 2026-10-05 |
| Mockoon | Partial | 8.4k | MIT | Open source | No | TypeScript | v9.9.0 | 2026-10-05 |
| REST Client | Partial | 6.1k | MIT | Open source | No | TypeScript | v0.25.0 | 2026-04-23 |
| gRPC UI | Partial | 5.9k | MIT | Open source | No | JavaScript | v1.5.4 | 2026-09-14 |
| ATAC | Partial | 3.7k | MIT | Open source | No | Rust | v0.23.1 | 2026-09-03 |
| Restfox | Partial | 2.8k | MIT | Open source | No | Vue | v0.40.0 | 2026-09-24 |
| Slumber | Partial | 1.2k | MIT | Open source | No | Rust | v5.3.0 | 2026-09-24 |
12 alternatives
Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia
Web-based API client that can be self-hosted.
Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)
Collections stored as plain files in your repository, no account needed.
Migration notes → Official migration guide ↗
The most intuitive desktop API client. Organize and execute REST, GraphQL, WebSockets, Server Sent Events, and gRPC 🦬
REST, GraphQL, gRPC and WebSocket requests in a desktop app, with no account needed.
Community hub for Requestly API Client — bugs, feature requests, and roadmap. The privacy-first Postman alternative.
Collections and environments in a local-first app, plus rules to intercept, modify and mock HTTP traffic.
Scalar is an open-source API platform: 🌐 Modern REST API Client 📖 Beautiful API References ✨ 1st-Class OpenAPI/Swagger Support
An API client generated from an OpenAPI document.
The modern API client that lives in your terminal.
HTTP requests in a terminal UI, with collections saved as YAML files next to your code.
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
Mock APIs only, run locally or in CI without an account.
REST Client Extension for Visual Studio Code
Requests written in .http files and sent from VS Code, without a collections UI or team workspaces.
An interactive web UI for gRPC, along the lines of postman
A browser UI for calling gRPC methods only.
A simple API client (postman like) in your terminal
A terminal UI client that imports Postman collections, without an account.
Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop
Offline-first HTTP and WebSocket client in the browser or on the desktop, imports Postman collections.
Terminal-based HTTP/REST client
A terminal UI client with collections kept in a YAML file.