Find the right API
Use search when the broad directory stops being enough. Filter by category, auth, CORS, signup friction, and result freshness until the shortlist becomes obvious.
Start with category and auth when you know the integration shape. Use free, signup, and CORS flags when you are trying to remove setup friction.
Sort by verification or response time when the final call is about reliability, not just category fit.
3 results after 1 active filters. Remove any one below without losing the rest of the cut.
Appwrite
Appwrite Server API is open-source Firebase alternative — auth, database, storage, functions, messaging integrated backend-as-a-service.
Home Assistant API
Home Assistant API is the local control interface for the open-source smart home platform — device states, automations, scenes, cross-vendor integrations (2500+ integrations).
PocketBase API
PocketBase is open-source Go single-binary BaaS (auth + DB + storage + realtime) — single-file deployment, zero ops; ultra-minimal Firebase alternative.