Altaflip: Sauna & Cold Tracker

Finally, a sauna app that does more than just track time.

Altaflip calculates your sweat loss and tells you exactly how much water to drink after each session. Using research from Finnish sauna studies and peer-reviewed thermoregulation science, the app accounts for your body weight, session duration, temperature, and even which bench you sat on.

SAUNA APP WITH SWEAT ESTIMATES

Most people leave the sauna dehydrated without realizing it. Altaflip estimates your fluid loss based on:

- Body
- Sauna temperature and type (traditional, infrared, steam)
- Session duration with sweat onset delay modeling
- Bench level position (upper benches are significantly hotter)
- Your heat acclimatization from recent sessions
- and more...

Then it calculates how much to drink to properly rehydrate, including electrolyte recommendations for longer sessions.

BENCH LEVEL INTELLIGENCE

Saunas have massive temperature differences from floor to ceiling. The thermometer shows the temperature at head height on the top bench, but sitting lower changes everything. Upper bench can be 20 degrees Celsius hotter than lower bench. Select your position and get estimated calculations.

TRACK SAUNA, COLD PLUNGE, AND CONTRAST THERAPY

Three session types, each with tailored tracking:

Sauna: Traditional, infrared, or steam room with temperature and bench level
Cold: Ice bath, cold plunge, cold shower, or outdoor swimming with cold dose calculation
Contrast: Alternating hot and cold rounds tracked as a unified practice

Cold sessions track your weekly cold dose based on temperature and duration.

RESEARCH-BASED PROTOCOLS

Built-in protocols from published studies:

- Finnish Longevity: Based on the 20-year study of 2,315 Finnish men showing 40 percent lower all-cause mortality with 4-7 weekly sessions at 80 degrees or higher
- Deliberate Heat: Heat exposure for health optimization
- Cold Exposure: Progressive cold adaptation with weekly dose targets based on the Soberg protocol
- Contrast Therapy: Structured hot-cold alternation

Set your weekly target within each protocol range and track compliance. The app shows which sessions qualified and your progress.

RELIABLE SESSION TIMER

Timestamp-based timer that stays accurate even when your phone is backgrounded or the app closes. Recovers your session automatically if interrupted. Large display optimized for glancing.

DAILY HYDRATION TRACKING

Track water intake alongside your sessions. Your daily goal adjusts automatically based on body weight plus any sauna session deficits. Visual progress ring, quick-add buttons, and weekly trends help you stay on top of rehydration.

SHARE YOUR ACHIEVEMENTS

Generate styled session cards showing your stats, sweat loss, and protocol progress. Share to Instagram, Twitter, WhatsApp, or save to your camera roll.

SMART NOTIFICATIONS

Session reminders at your preferred time, streak protection alerts, protocol progress nudges, and post-session hydration reminders. All optional and configurable.

WORKS OFFLINE

All data stored locally on your device. No account required. Your sessions are yours.


HEART RATE ANALYTICS

Connect any standard Bluetooth heart rate monitor (Polar, Garmin, Wahoo, CooSpo, Scosche, and more) for real-time HR during sessions. After your session, get detailed analytics:

- Estimated calorie burn using research-backed formulas for heat and cold
- Thermal load score (Edwards TRIMP) with heart rate zone breakdown
- and more

OPTIONAL CLOUD BACKUP

Sign in with Google or Apple to back up your data and restore across devices. Never required.

FREE FEATURES

Session logging, sweat estimates, basic streaks, session timer, sessions history, one protocol, social sharing

PREMIUM UNLOCKS

Multiple protocols, contrast tracking, hydration tracking, detailed trends and streaks, health benefits tracking, cloud backup, hydration reminders

Start with a 14-day free trial of all premium features.

Terms of use - https://www.altaflip.com/terms-of-service

Recent changes:
- Your session now runs live in the notification shade and on your lock screen - type, timer and heart rate at a glance. Tap it to jump back in.
- The session timer no longer blacks itself out when something covers the top of your phone.
- Heart rate is steadier: no stale readings, no endless "Reconnecting", and the device list scans as soon as you open it.
- Keyboards no longer cover what you're typing.