Best Open Source Alternatives to MongoDB

Compare the best free and open-source alternatives to MongoDB — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated November 2026 · 8 alternatives

MongoDB

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MongoDB alternatives compared

Open-source alternatives to MongoDB, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
Timescale	23,793	—	Web	No	Nov 2026	Visit
Turso	17,307	MIT	Web	No	Oct 2026	Visit
Convex	12,773	—	DockerLinux	Yes	Nov 2026	Visit
Instant	10,563	Apache-2.0	Web	No	Oct 2026	Visit
OceanBase	10,365	Apache-2.0	Web	No	Oct 2026	Visit
Activeloop	9,264	Apache-2.0	Web	No	May 2026	Visit
Memgraph	4,643	—	Web	No	Nov 2026	Visit
SlateDB	3,609	Apache-2.0	Web	No	Nov 2026	Visit

Top open-source MongoDB alternatives

Timescale23,793

Timescale replaces Amazon Timestream with a PostgreSQL extension offering automated hypertable partitioning, columnar compression, and native SQL joins.

Web

vs MongoDB: a free, open-source option you fully control.

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Turso17,307MIT

Turso provides edge-replicated SQLite databases that replace centralized cloud databases like PlanetScale with sub-millisecond local reads.

Web

vs MongoDB: a free, open-source option you fully control, licensed MIT.

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Convex12,773

Convex is an open-source reactive database and backend runtime replacing Supabase with end-to-end TypeScript functions and live WebSocket queries.

DockerLinux

vs MongoDB: a free, open-source option you fully control.

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Instant10,563Apache-2.0

Instant is an open-source Firebase alternative delivering real-time relational queries, optimistic UI updates, and data control on self-hosted PostgreSQL.

Web

vs MongoDB: a free, open-source option you fully control, licensed Apache-2.0.

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