Supabase

Use it for: Postgres database, logins and row-level security for client data.
Pricing: Free tier is plenty for one gym; Pro for production.
Operator's verdict: The default backend for AI-built fitness apps. Turn on row-level security or your clients can read each other.
Official site: https://supabase.com ↗

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More databases & backends

Databases & backends

Google's database, auth and hosting for web and mobile apps.

verdict › Fine choice, but most AI builders and kits assume Supabase. Swim with the current.

Generous free Spark plan; pay-as-you-go Blaze.

Databases & backends

Serverless Postgres with branching, for when you want just a database.

verdict › Clean Postgres. You'll add your own logins and rules, so more work than Supabase.

Free tier; usage-based paid plans.

Databases & backends

Spreadsheet-database for class rosters, leads and member lists.

verdict › Perfect back office for a small team. Not a client-facing database at scale.

Free tier; paid per seat.