Track heart rate, HRV, and recovery through every round of heat and cold, right from your wrist. See your wellness as a face, not a spreadsheet. Find saunas nearby.
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You step out of the heat. The world feels softer. Your breathing slows. Maybe you sleep a little deeper that night. Saavu is the app that connects those feelings to what is actually happening in your body, and remembers, so the next week you can do it again with intent.
No spreadsheets. No clinical dashboards. Just your watch, your phone, and a quiet log of how your body is changing.
The smoke arrives. Your body changes. Saavu remembers.
Apple Watch goes everywhere with you. Saavu uses it to track every round of heat and cold, your heart rate the whole way through, and your HRV recovery in the minutes after. You do not touch your phone in the sauna.
When you step out, pick one of six faces. Tense, baseline, heat, cold, thriving, peak. Add a note if you want. That is the entire post-session UI. Thirty seconds.
Over weeks, your HRV trends settle. Your tolerance climbs. The face you tap shifts. Saavu shows you the pattern in a single chart, and writes you a two-sentence summary every Sunday so you know what just happened.
The screen you actually use during a session has to be legible with sweat on it, work upside-down, and never get in your way. Saavu's Active Session screen has been designed for exactly that.
A circular timer in the colour of the phase. Ember for heat, navy for cold, ash for rest.
Streamed from your watch every second. Glows ember past your comfort zone.
Tap once to mark a round done. Long-press to add another mid-session.
Gentle audio cue or a buzz on your wrist when each phase ends. Both toggleable.
The rest phase is the most under-used part of a contrast session. Most people sit there scrolling. Saavu's breathing guide is a soft circle that scales with each inhale and exhale, so you can drop your phone face-down and just follow the rhythm.
Fast in, long out. Calms the gasp reflex so you can stay in longer.
Equal inhale, hold, exhale, hold. The all-rounder.
Long exhale dominant. The one that drops you into sleep.
Thirty fast cycles, then a retention. Energising primer.
Two short inhales, one long exhale. Best stress-shedder.
Sauna is mostly safe. The unsafe part is when it isn't, and you aren't sure. Saavu watches for the signs you might miss.
If your heart rate climbs past your comfort zone, both your watch and your phone buzz. You decide what to do.
Fifteen minutes after every session, a quiet notification reminds you to drink. Saavu estimates sweat loss too.
Every alert is optional. Every notification can be muted. The app does not interrupt your session.
Most fitness apps end a workout with a chart. Saavu ends it with a face. You pick one of six face-states that capture how your body actually feels. The metrics sit underneath, but the face is the headline.
Tense, baseline, heat, cold, thriving, peak. Each one a small animated drawing in its own colour.
Your HRV before and after, in one number. Positive numbers in heat are a good sign.
Free text. Searchable later, even across two years of sessions.
A rough estimate based on duration and heat. Pairs with the hydration nudge.
Saavu Pro turns your last few weeks of sessions into something you can read. A wellness ring that fills as you build a rhythm. An HRV chart that smooths out as you adapt. A heat-tolerance progression line that climbs as you push your minutes up. And once you have ten sessions on the clock, a handful of insights written just for you.
Weekly composite score from HRV, frequency, sleep correlation, and consistency. Eight weeks at a glance.
Last fourteen sessions plotted. See in seconds whether your nervous system is settling.
"Your sauna minutes climbed from 11 to 14 this week." Plain English, not a graph.
Three sentence-long insights once you have ≥10 sessions. Written just for you.
Every seven days, Saavu writes you a short personal summary based on the last week of sessions. Not a chart. Not statistics. Just two sentences, in a warm tone, that name what you have actually been doing.
If you are new to sauna or cold work, a blank timer can feel intimidating. Saavu Pro ships with three opinionated programmes, each laid out as a multi-week schedule. Tap "Start today's session" and the right durations and rounds are already loaded.
A guided progression from eight-minute sauna rounds to eighteen-minute rounds. Three sessions per week, one rest day between each.
What you will feel: the first two weeks build a baseline. By week three you notice your breathing settle earlier. By week four, eighteen minutes feels achievable.
An evening protocol. Warm sauna, no cold, long rest. The post-sauna drop in core temperature mimics the natural pre-sleep dip and helps you fall asleep faster.
What you will feel: two weeks is enough to notice the difference. Most users fall asleep faster by week one.
Saavu's venue map shows every approved sauna near you, with filters for facility type. Finnish, infrared, steam room, cold plunge, wild sauna, hammam, banya, onsen.
Distance-sorted list, geographic map, filter by facility type. Works offline once loaded.
One tap. Auto-links the venue to your session when you save it.
Pins to the top of your home screen so you can launch your usual session from there.
Sauna is a shared ritual for a lot of people. Saavu's social layer is built around that, but without the dopamine traps of public activity feeds. There are no likes, no comments, no public photos. Just buddies, your weekly count next to theirs, and a streak you both want to keep alive.
Three to thirty-two characters. Letters, numbers, underscores. Your handle is how friends find you.
Friends see your weekly count, your streak, your average minutes. Never your raw sessions, notes, or HRV.
Your notes, mood, and HRV stay yours. The aggregate row is the social currency.
Saavu does not live in just one app. It is on your wrist, on your lock screen, on your watch face, and folded into your Apple Health workout history.
Real native watch app. Start a session, see your live timer and HR, save when you are done. Works without the phone in range.
Current streak and last HRV pinned to your watch face. Glance, see where you stand.
Current phase, round, and countdown on your Lock Screen and Dynamic Island. Press to expand.
Writes to Apple Health as a workout. Minutes count toward your Move ring. Shows up alongside your runs.
Not everyone wears an Apple Watch. If you live in a Whoop, an Oura ring, or a Garmin, Saavu Pro connects to your existing wearable and pulls in recovery, sleep, and HRV data so your insights stay rich.
Recovery, strain, sleep, cycles. Pulled in daily, shown alongside your sessions.
Daily readiness, heart rate, sleep stages. Pairs with Sleep Recovery programme.
Body Battery, training readiness, HRV.
Recovery Pro, sleep, nightly HRV.
Every December, a small banner appears on your home screen. Tap it for your year in heat. Total sessions, total minutes, your longest streak, your favourite venue, your most-felt face state, your total sweat lost. Shareable as a single image to Instagram, iMessage, anywhere.
Twelve months of small wins, in one place, once a year.
Saavu's job is to help you understand your body, not to mine it. We never sell your data. We never share it with advertisers. The handful of friends you choose to add are the only people who see anything about you, and even then they only see aggregate counts, never individual sessions.
One tap. A full file of every session, every check-in, every note.
Thirty days to change your mind. Sign back in within the window and your account fully restores.
Your login is locked behind your phone's passcode.
Every notification independently togglable. Turn off what you want.
Saavu's free tier is genuinely useful. You can track every session, see your last ten in history, save notes, check in at venues, write to Apple Health, build a streak. The paid tier unlocks the parts that only become valuable once you have a few weeks of data behind you.
Billed through Apple or Google. No card details ever leave the App Store. Pro is monthly or annually, never longer. Cancel from your Apple ID settings the same way you cancel a Spotify subscription.
Saavu's launch is just the start. The roadmap below is what we are building over the next twelve to eighteen months, in priority order.
Track your sauna sessions. See the proof. Find your next venue.