Sauna Metrics turns every session into data. Real-time rounds, temperature, humidity and duration — paired with how you actually feel before and after.
Not just a habit tracker. Sauna Metrics measures the actual physiological cost and benefit of every session you log.
Round-by-round timing. Heat, break, and recovery states tracked in real time. Multi-round, multi-temperature, multi-protocol.
Sweat loss, calories burned, hydration recommendation, body weight change, and core temperature estimate per session.
Log stress and mood before and after every session. Watch the delta close week over week.
Sauna hat, ice cooling, breathing, plunges. Tag what you used and find which protocols actually move your numbers.
See exactly how heat exposure affects your sleep score, deep sleep and HRV. Built on Apple Health.
Resting heart rate and HRV across weeks of training. Adaptation, not anecdote.
A neo-brutalist interface that feels like a laboratory instrument — built inside a sauna temple.
What 30 years of Finnish heat exposure data really tells us about lifespan.
Two heat sources, two physiologies. Pick the one that matches your goal.
When the contrast helps adaptation, and when it just blunts your gains.
Free to download. No accounts. No ads. Your data lives on your device and in your iCloud.