Open-source alternatives to Postman
Postman stores API collections and runs requests and tests against them. The list below is every catalog tool tagged Software Development - API Management, which is the closest the catalog gets to the same job; none of them has been checked feature by feature against Postman.
| Tool | Stars |
|---|---|
Fast and beautiful API request builder. MIT · released 2026-08-28 | 80,239 |
Microservice API Gateway and Platform. Apache-2.0 · released 2026-06-17 | 44,096 |
Fast, instant realtime GraphQL APIs on Postgres with fine grained access control, also trigger webhooks on database events. Apache-2.0 · released 2026-08-18 | 32,115 |
Integration platform for AI agents & LLMs with support for 250+ apps and custom tools. Elastic-2.0 · released 2026-09-07 | 30,091 |
Evaluate, test, and ship LLM applications with a suite of observability tools to calibrate language model outputs across your dev and production lifecycle. Apache-2.0 · released 2026-09-07 | 21,859 |
Fast and scalable open source API Gateway. Out of the box, Tyk offers an API Management Platform with an API Gateway, API Analytics, Developer Portal and API Management Dashboard. MPL-2.0 · released 2026-07-07 | 10,818 |
High-performance API Gateway. Apache-2.0 · released 2025-10-30 | 6,794 |
Webhooks as a service that makes it super easy for API providers to send webhooks. MIT · released 2026-09-03 | 3,391 |
API management platform which helps to build and manage REST APIs. AGPL-3.0 · released 2026-08-16 | 2,114 |
Turns any SQL/NoSQL/Structured data into Restful API. Apache-2.0 · released 2026-08-18 | 1,785 |
AI gateway written in Go with a unified OpenAI-compatible API for multiple LLM providers, USD cost tracking, budgets, usage analytics, guardrails, caching, and an admin dashboard. MIT · released 2026-09-06 | 1,116 |
Flexible and modular backend framework/server for object persistence, API development and authentication. Apache-2.0 · released 2026-08-24 | 573 |
Turn multiple data sources into a single GraphQL API. MIT · released 2026-08-14 | 553 |
Extensible API Gateway written in Go. Apache-2.0 · released 2026-08-27 | 22 |
Webhooks-as-a-service (WaaS) that makes it easy for online products to provide webhooks. Dispatch up to 3,000 events/month with 7 days of history retention for free. SSPL-1.0 · released 2026-08-26 | 15 |
A REST API building platform that utilizes a drag & drop form builder, and is application framework agnostic. Contains open source and enterprise version. MIT · released unknown | n/a |
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