firebase-alternative

Open source alternatives to paid SaaS apps: Notion, Slack, Auth0, Vercel and more. Curated list with licenses and GitHub stars.

Open source Auth0/Keycloak alternative. Passkeys, SSO, MFA, passwordless, biometric login. Self-hosted or cloud. Enterprise-ready for SaaS & mobile apps

🚀 A future-proof enterprise web CMS supporting both headless and decoupled approaches. Build any type of app with customizable APIs on ASP.NET Core/.NET Core. Completely open-source and designed for flexibility. Since 2018.

The open-source Firebase for Cloudflare.

Autonomous backend platform. Your coding agent builds it over MCP, Backenly keeps it running: Postgres, REST APIs, auth, storage, realtime, and functions, with every change governed, verified, and reversible.

Open-source self-hosted feature flags & remote config — a Firebase Remote Config alternative. One REST API, any language, Docker-first. Apache 2.0.

DynamicLink is a lightweight, Firebase-free alternative for handling dynamic links and deep links in web and mobile hybrid environments

Open-source backend in a single C++ binary: instant REST APIs, auth, realtime, admin dashboard. The embeddable PocketBase alternative.

LocalBase — Your self-hosted backend, in one Python file. A lightweight Supabase alternative with SQLite databases, auto-generated REST APIs, a SQL editor, data grid, API keys, realtime WebSockets, backups, and a beautiful dashboard. No Docker, no Node, no cloud. Just python localbase.py.

Self-hosted backend compatible with the official Firebase SDKs. One Go binary and PostgreSQL.

Clorabase is a free & open source backend (BaaS) alternative for android & java apps. Turn your github repo into a NoSQL database and cloud storage for your app

Offline-first, real-time sync engine for web apps. Self-hosted, written in Go: IndexedDB in the browser, SQLite or PostgreSQL on the server.

☁️ Cloud sovereignty for developers. AI agent primitives. BaaS in a binary. Written in Rust.

Open-source s&box game backend. Self-host saves, inventory, purchases and reward rules for player-hosted, P2P or dedicated games. SQLite/PostgreSQL.

⚡ Self-hosted, enterprise-grade Firebase alternative built on PostgreSQL JSONB, Fastify, Next.js 14, and Docker. Multi-tenant Auth, Realtime Firestore SDK, granular rules engine, and Coolify 1-click deployment.

Postgres-based key-value database backend server, perfect for simple applications that need basic cloud storage / syncing

Self-hosted backend for side projects. Key/value store + Event API + Admin dashboard. One PHP file, no Composer, no containers.

Open-source self-hosted Supabase/Firebase alternative: multi-tenant backend with per-project PostgreSQL, auth, storage & REST API.

Globio - All In One Backend As A Service.

Backend gratis, privado y local-first: alternativa a Firebase y Supabase. Datos cifrados en cada dispositivo, relés P2P, SDK Android y web. Creado por Juan Manuel Peralta Chacon.