Firebase
Google Firebase is a hosted app backend covering Firestore, Realtime Database, Authentication, Cloud Storage, Cloud Functions and Hosting; these pages cover replacing it with self-hosted Supabase, Appwrite or, for smaller apps, PocketBase.

Hosted app backends that bundle authentication, a client-facing database, file storage, functions and realtime updates, such as Firebase and Supabase Cloud, and the self-hosted open-source platforms that replace them: Supabase, Appwrite and PocketBase.
Google Firebase is a hosted app backend covering Firestore, Realtime Database, Authentication, Cloud Storage, Cloud Functions and Hosting; these pages cover replacing it with self-hosted Supabase, Appwrite or, for smaller apps, PocketBase.
Supabase Cloud is Supabase's hosted Postgres development platform, sold in Free, Pro, Team and Enterprise plans; these pages cover moving to self-hosted Supabase, the Apache-2.0 open-source stack run in your own infrastructure.
AWS Amplify is AWS's toolkit and hosting service for web and mobile apps, whose Gen 2 backends run on Cognito, AppSync, DynamoDB, Lambda and S3. Pages here cover moving to self-hosted Supabase or Appwrite.
Appwrite Cloud is the hosted edition of the BSD-3-Clause Appwrite backend platform, sold in Free, Pro and Enterprise plans. Pages here cover running the same Appwrite stack in your own infrastructure.
Back4app is a hosted backend platform built around the Parse ecosystem, priced per app. Pages here cover running open-source Parse Server yourself or moving to self-hosted Appwrite or Supabase.
Nhost Cloud is the hosted edition of Nhost, an MIT-licensed backend of Postgres, Hasura GraphQL, auth, storage and functions. Pages here cover self-hosting Nhost or moving to Appwrite or Supabase.

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