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?

AI analysis is available once you have logged match data and generally becomes more informative as your match history grows. When you request AI Insights, only privacy-filtered, allowlisted match data is sent. Personal identifiers are removed or pseudonymized before the request leaves the app.

Which languages are supported?

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