Sauna app for iPhone and Apple Watch

Key takeaways

• Degree Daddy is a sauna app for iPhone, iPad, and Apple Watch.
• Sauna timer, temperature logging up to 220°F, venue tagging, and streaks.
• Pushes sauna sessions to Strava — Strava has no sauna activity type of its own.
• Writes to Apple Health as a workout, so Whoop, Oura, and Garmin see it.
• Apple Watch app means you are not taking your phone into a 180°F room.
• Free during beta. No subscriptions, no ads, no account required.

Sauna sessions are easy to do consistently and hard to track. Fitness apps have no sauna session type, no temperature field, and no way to represent heat exposure. Degree Daddy is built for it.

What the app does

A timer you can run from your wrist

Taking an iPhone into a traditional sauna is bad for the phone and awkward in practice. Degree Daddy includes a standalone Apple Watch app, so you start and stop the session from your wrist and it syncs back to your iPhone through iCloud. The timer keeps running if the app is backgrounded or killed.

Temperature logging up to 220°F

Traditional saunas typically run 150–195°F and infrared saunas run cooler at roughly 120–150°F. Degree Daddy supports up to 220°F and toggles between °F and °C, so both styles log accurately.

Streaks and history

Current and all-time-best streaks on the home screen, with grace days so travel does not reset your progress. Full session history with duration, temperature, venue, and your own rating.

Venue tagging

Tag the gym, spa, or bathhouse from nearby-venue suggestions. Useful if you rotate between a home sauna and a club.

Strava integration

Strava has no sauna activity type, which means regular sauna use leaves no trace on your feed. Degree Daddy creates the Strava activity for you with duration and temperature in the name — “Sauna - 18:00 at 180F” — and deep links so you can attach the session card as the activity photo.

The full walkthrough is at how to log a sauna session on Strava.

Apple Health and wearables

Every sauna session writes to Apple Health as a workout with temperature data, so Whoop, Oura, Garmin, and anything else reading HealthKit picks it up automatically. If you track recovery seriously, this keeps heat exposure in the same place as the rest of your data.

What it costs

Free during beta. No subscriptions, no ads, no in-app purchases, no account. Data lives on your device and syncs across your devices via iCloud, and everything works offline.

Frequently asked questions

Is there a sauna app for iPhone?

Yes. Degree Daddy is a sauna and cold plunge app for iPhone, iPad, and Apple Watch with a session timer, temperature logging up to 220°F, streaks, Strava integration, and Apple Health sync. It is free during beta.

Is there a sauna app for Apple Watch?

Yes. Degree Daddy includes a standalone Apple Watch app, so you can start and stop a sauna session from your wrist rather than bringing your iPhone into the heat. Sessions sync back through iCloud.

Can a sauna app sync to Strava?

Degree Daddy does. Strava has no sauna activity type, so Degree Daddy creates the activity as a Workout with your duration and temperature in the name, for example "Sauna - 18:00 at 180F".

Does it work for infrared saunas?

Yes. Degree Daddy supports temperatures up to 220°F and switches between °F and °C, which covers infrared saunas at roughly 120–150°F as well as traditional saunas at 150–195°F.

Does the sauna app write to Apple Health?

Yes. Every session is written to Apple Health as a workout with temperature data, so Whoop, Oura, Garmin, and any other HealthKit-reading app or device picks it up automatically.