Supabase

Supabase is an open-source alternative to Firebase. Supabase is not a 1-to-1 mapping of Firebase. While they are building many of the features that Firebase offers, they are not going about it the same way. Their technological choices are quite different to Firebase. Everything they use is open source. Wherever possible they use and support existing tools in the ecosystem, rather than developing from scratch. Supabase adds realtime and RESTful APIs to your PostgreSQL database without a single line of code.