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

Convex

Reactive TypeScript database for live-updating web applications

Appwrite

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

Nhost

Open-source Firebase alternative delivering instant GraphQL backend

Supabase

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

Instant

Real-time database for your frontend with multiplayer by default

Parse Server

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

PocketBase

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

Laf

Open-source cloud development platform with serverless functions and 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

UNDB

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

Space Cloud

Instant realtime APIs for any database on Kubernetes