Best Open-source Backend-as-a-Service (BaaS) tools

Convex

Reactive TypeScript database for live-updating web applications

Parse Server

Self‑hosted Node.js backend compatible with MongoDB, PostgreSQL, and GraphQL

Supabase

Postgres platform delivering Firebase-like features with open-source tools

Appwrite

End-to-end backend platform for web, mobile, and native apps

Instant

Real-time database for your frontend with multiplayer by default

Nhost

Open-source Firebase alternative delivering instant GraphQL backend

PocketBase

Single‑file Go backend with realtime, auth, and file storage

Kuzzle

Generic backend with API, storage, and realtime capabilities

CloudBoost

Self-hosted backend platform combining data, realtime, and search

Nitric

Write code, let Nitric handle cloud infrastructure automatically

Userbase

Add secure user accounts and encrypted storage to static sites

Triplit

Full-stack syncing database for server and browser real-time apps

Laf

Open-source cloud development platform with serverless functions and storage

UNDB

Self-hosted no-code database and BaaS powered by SQLite

Space Cloud

Instant realtime APIs for any database on Kubernetes