Is Tennis Log free?

Yes. The core app — match logging, stats, opponent analysis, smartwatch import and AI insights — is free and intended to stay free.

Where is my data stored?

In a managed Postgres database (Supabase) with row-level security: only your account can read your matches. You can export everything to CSV at any time, and delete your account from Settings.

Can I track doubles and mixed?

Yes. Each match is tagged as singles, doubles or mixed, with partners and opponents stored separately so the head-to-head views stay clean.

Which smartwatches are supported?

Any watch that produces a screenshot of a tennis activity works: Apple Watch, Garmin, Polar, Coros, Suunto and others. The AI parser reads heart-rate zones, calories and duration from the image.

How are AI insights generated?

Once you have 5+ logged matches, an AI model summarises patterns across your history into plain-language observations. The model only sees aggregated stats, never personal identifiers.

Which languages are supported?

Seven: English, Greek, Spanish, French, German, Italian and Japanese.