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Open Source Backend-as-a-Service (BaaS) Tools using CSS

A curated collection of the best open source cloud-based platforms providing backend services like databases, authentication, and storage. using CSS.

Supabase

Postgres-powered backend platform for production apps

  • Stars

    111,992

  • Last commit

    6 hours ago

  • License

    Apache-2.0
Provides a full backend stack built on Postgres: authentication, auto-generated APIs, edge functions, realtime subscriptions, file storage, and vector search.

Open Source Alternative to:

Firebase

Directus

Open-source data platform for effortless content management

  • Stars

    38,622

  • Last commit

    7 hours ago

  • License

    Unknown
A versatile headless CMS and API engine that simplifies data management, content creation, and application development.

Open Source Alternative to:

WordPress

Convex

Build full-stack apps with TypeScript and real-time sync

  • Stars

    12,727

  • Last commit

    4 days ago

  • License

    Unknown
Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.

Open Source Alternative to:

Supabase

Instant

Realtime client-side database for collaborative apps

  • Stars

    10,550

  • Last commit

    1 day ago

  • License

    Apache-2.0
Instant is a database solution for building real-time and offline-enabled applications, simplifying the development of collaborative products.

Open Source Alternative to:

Supabase

NHost

Serverless backend platform for modern app development

  • Stars

    9,363

  • Last commit

    6 hours ago

  • License

    MIT
Fully managed backend infrastructure with built-in authentication, database, storage, and serverless functions for rapid application development.

Open Source Alternative to:

Supabase

Rowy

Build powerful backends without leaving your browser

  • Stars

    6,843

  • Last commit

    2 years ago

  • License

    Apache-2.0
A low-code platform for creating robust backends, complete with a spreadsheet UI for easy data management and custom functions.

Open Source Alternative to:

Airtable

Bknd

Feature-rich backend that runs anywhere you need it

  • Stars

    3,774

  • Last commit

    26 days ago

  • License

    Apache-2.0
Lightweight Firebase alternative with database, auth, storage, and workflows. Framework-agnostic backend that integrates with NextJS, Remix, Hono and more.

Open Source Alternative to:

Supabase

undb

Local-first, offline-first no-code database platform

  • Stars

    2,977

  • Last commit

    28 days ago

  • License

    AGPL-3.0
Build and manage custom databases with ease, create type-safe APIs, and develop applications quickly

Open Source Alternative to:

Supabase
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