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self-host the SaaS you're paying for

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Firebase vs MongoDB Atlas

Self-host either: open-source alternatives compared.

Firebase and MongoDB Atlas both have open-source self-host stand-ins. Pocketbase self-hosts as a replacement for both — listed below alongside the picks unique to each.

FirebaseMongoDB Atlas
CategoryBackend-as-a-service (auth + DB + storage + realtime)Document database (managed)
SaaS pricing anchorFree Spark tier; Blaze starts at $0 and scales by reads/writes/storage — easy to hit $50-200/mo on a real app$57/mo M10 dedicated cluster; $400+/mo at production scale
Self-host options listed33

Replaces both — 1 shared open-source pick

These open-source projects appear on both /firebase/ and /mongodb-atlas/ — picking one solves the migration off either SaaS.

Pocketbasepocketbase/pocketbasealivereplaces both

GitHub
★ 58.3k · last commit today
License
MIT
Setup time
5min — single Go binary + SQLite
Monthly cost
$5 VPS handles low-to-medium traffic; SQLite + WAL is surprisingly far-reaching.

Picks unique to each

Firebase only

  • Supabasealive
    Apache-2.020min docker-compose (the official self-host bundle)$10-20 VPS — Postgres + GoTrue + PostgREST + Realtime + Storage in one stack.
  • Appwritealive
    BSD-3-Clause10min docker-compose (single-command install)$10 VPS for a small app; the stack pulls a few containers (server, MariaDB, Redis, InfluxDB).

MongoDB Atlas only

  • MongoDB Community Serveralive
    SSPL-1.010min (apt / docker)$5 VPS for dev; $10-20 for small production with replica set.
  • FerretDBstale
    Apache-2.010min docker-compose (FerretDB + Postgres)$5-10 VPS — Postgres backend does the heavy lifting.

In a terminal? npx os-alt firebase or npx os-alt mongodb-atlas prints either side — how the CLI works →

FAQ

Which open-source self-host alternatives replace both Firebase and MongoDB Atlas?

1 open-source project appears on both /firebase/ and /mongodb-atlas/: Pocketbase.

How many self-host alternatives are listed for Firebase and MongoDB Atlas?

3 for Firebase, 3 for MongoDB Atlas.

Are all the self-host alternatives free?

Yes — every listed option is open source. Your cost is the VPS or hardware that runs it.