# 1 Best Open-Source Alternatives to MongoDB Atlas in 2026

By Noah — last updated & pricing verified September 15, 2026.

> 1 of the 4 MongoDB Atlas alternatives we list qualify for this filter. The [full list](https://findalternative.to/mongodb-atlas) is the canonical page.

| Alternative | Best for | Price | Details |
| --- | --- | --- | --- |
| Supabase | developers who want a Postgres-based backend (auth, storage, realtime, auto-generated APIs) they can self-host later, rather than committing to a proprietary NoSQL platform like Firebase | Free tier · paid from $25/mo | https://findalternative.to/supabase/about |

All 4 alternatives to MongoDB Atlas: https://findalternative.to/mongodb-atlas

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Markdown mirror of https://findalternative.to/mongodb-atlas/open-source — findalternative.to, honestly ranked software alternatives. AI info: https://findalternative.to/ai