Self-hosted alternatives to Postman
It moved collections to the cloud by default, then started charging for what used to be local.
Below are 10 open-source projects that cover the same ground, each scored 0–100 on how actively it is actually maintained — commit volume, release cadence and recent trend. 7 of the 10 are currently rated healthy or better. Ordering reflects that score, not sponsorship.
| Project | Health | Activity (11 mo) | Stars | Licence | Last release |
|---|---|---|---|---|---|
| Composio Integration platform for AI agents & LLMs with support for 250+ apps and custom tools. | Thriving · 90 | 30k | Elastic-2.0 | 24 Sept 2026 | |
| Opik Evaluate, test, and ship LLM applications with a suite of observability tools to calibrate language model outp | Thriving · 89 | 22k | Apache-2.0 | 25 Sept 2026 | |
| Svix Webhooks as a service that makes it super easy for API providers to send webhooks. | Healthy · 81 | 3.4k | MIT | 11 Sept 2026 | |
| Hasura Fast, instant realtime GraphQL APIs on Postgres with fine grained access control, also trigger webhooks on dat | Healthy · 76 | 32k | Apache-2.0 | 9 Sept 2026 | |
| Hoppscotch Community Edition Fast and beautiful API request builder. | Healthy · 75 | 81k | MIT | 23 Sept 2026 | |
| GoModel AI gateway written in Go with a unified OpenAI-compatible API for multiple LLM providers, USD cost tracking, b | Healthy · 72 | 1.2k | MIT | 26 Sept 2026 | |
| Graphweaver Turn multiple data sources into a single GraphQL API. | Healthy · 71 | 556 | MIT | 22 Sept 2026 | |
| Tyk Fast and scalable open source API Gateway. Out of the box, Tyk offers an API Management Platform with an API G | Steady · 67 | 11k | MPL-2.0 | 7 Jul 2026 | |
| Kong Microservice API Gateway and Platform. | Steady · 60 | 44k | Apache-2.0 | 17 Jun 2026 | |
| DreamFactory Turns any SQL/NoSQL/Structured data into Restful API. | Steady · 60 | 1.8k | Apache-2.0 | 24 Sept 2026 |
How these were picked
Every project listed here is open source and can run entirely on hardware you control. We start from the categories that match Postman's job — Software Development - API Management, Software Development - IDE & Tools — then rank by health score so that a popular-but-abandoned project never appears above a smaller one that is actively shipping. The scoring method is documented in full.
The scores are recomputed from repository data on every rebuild, so this page reflects the state of these projects as of 1 Oct 2026 — not the day it was written.
Composio
Integration platform for AI agents & LLMs with support for 250+ apps and custom tools.
Best fit: Developers building autonomous AI agents or custom LLM workflows that require structured access to numerous third-party APIs.
Worth knowing: The Elastic-2.0 licence is source-available rather than strictly open-source, which may restrict commercial managed-service offerings. Additionally, relying on an extensive integration layer introduces numerous external points of failure.
Opik
Evaluate, test, and ship LLM applications with a suite of observability tools to calibrate language model outputs across your dev and production lifecycle.
Best fit: Development teams building language model applications who need internal tooling to test outputs, track behaviour, and maintain quality control across environments.
Worth knowing: The platform introduces significant architectural complexity and storage requirements typical of telemetry systems, meaning you will need to monitor resource consumption carefully in production.
Svix
Webhooks as a service that makes it super easy for API providers to send webhooks.
Best fit: Development teams building public APIs who need a dedicated system to handle outgoing webhooks without relying on third-party cloud services.
Worth knowing: Deploying and operating a dedicated webhook delivery pipeline introduces additional infrastructure complexity compared to writing ad-hoc queuing logic within your existing application.
Hasura
Fast, instant realtime GraphQL APIs on Postgres with fine grained access control, also trigger webhooks on database events.
Best fit: Developers who need a rapid GraphQL interface over a PostgreSQL schema without writing boilerplate API routing code.
Worth knowing: Adopting this tooling ties your API layer tightly to its specific execution model and schema introspection patterns, which can complicate future migrations away from it.
Hoppscotch Community Edition
Fast and beautiful API request builder.
Best fit: Teams and individual developers who want a lightweight, self-hosted alternative to proprietary API development workbenches.
Worth knowing: It requires ongoing maintenance to stay aligned with upstream releases, and you may need to configure user authentication manually for multi-user setups.