Supabase - Supabase is an open source Firebase alternative.
Start your project with a Postgres database, Authentication, instant APIs, Edge Functions, Realtime subscriptions, Storage, and Vector embeddings.
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Top 8 SUPABASE alternative to (Free, Open Source,...)
1.Firebase
2.Auth0
3.Okta
4.Timescaledb
5.Pocketbase
6.nhost
7.dokploy
8.instant

Firebase
Google's Mobile and Web App Development Platform

Auth0
Implement Auth0 in any application in just five minutes

Okta
Employee and Customer Identity Solutions

Timescaledb
An open-source time-series SQL database optimized for fast ingest and complex queries. Packaged as a PostgreSQL extension.

Pocketbase
Open Source backend for your next SaaS and Mobile app in 1 file

nhost
The Open Source Firebase Alternative with GraphQL.

dokploy
Open Source Alternative to Vercel, Netlify and Heroku.

instant
The realtime client-side database
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SUPABASE similar to (sort by popularity)
1.keycloak
2.Appwrite
3.convex.dev
4.hydra
5.SuperTokens
6.Authentik
7.authelia
8.logto
9.Zitadel
10.hanko
11.encore

keycloak
Open Source Identity and Access Management For Modern Applications and Services

Appwrite
Your backend, minus the hassle.

convex.dev
Convex | The fullstack TypeScript development platform

hydra
OpenID Certified™ OpenID Connect and OAuth Provider written in Go - cloud native, security-first, open source API security for your infrastructure.

SuperTokens
Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Authentik
The authentication glue you need.

authelia
The Single Sign-On Multi-Factor portal for web apps

logto
🧑🚀 The better identity infrastructure for developers and the open-source alternative to Auth0.

Zitadel
ZITADEL - Identity infrastructure, simplified for you.

hanko
Authentication and user management system optimized for passkeys
encore
Encore is the Backend Development Platform for building distributed systems and event-driven applications.