SweatRate
Sweat test & hydration
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Measure your real hourly sweat rate from a simple weigh-in, learn how you sweat in the heat, and know how much to drink next time. One-time purchase, no subscription.
SweatRate turns a simple before-and-after weigh-in into your personal hourly sweat rate — the number athletes use to nail their hydration. No guesswork, no generic charts: just your own body, measured.
HOW IT WORKS
Weigh yourself right before and right after a workout, add how much you drank and how long you trained. SweatRate does the math instantly using the proven body-mass method:
Sweat loss = (weight before − weight after) + fluid you drank
Sweat rate = sweat loss ÷ time
You immediately see your sweat loss, your sweat rate per hour, and how much body mass you lost — with a warning if you crossed the 2% dehydration line where performance drops.
KNOW YOUR NUMBER FOR EVERY CONDITION
Log a few sessions and SweatRate learns how you sweat at different temperatures. Cool morning run or a scorcher at noon — you get your own rate for each heat band, not a one-size-fits-all estimate.
PLAN YOUR NEXT DRINK
Tell SweatRate how long your next session will be and it recommends exactly how much to drink to stay ahead of dehydration, with a handy "sip every 20 minutes" target.
BUILT FOR ATHLETES
• Runners, cyclists, gym-goers, hikers and sauna lovers
• Metric and imperial units (kg/mL/°C or lb/fl oz/°F)
• Trend chart of your sweat rate over time
• Everything stays on your device — no account, no tracking
Free to try with your first 3 sessions. Unlock SweatRate Pro once for unlimited records, full trend charts and temperature insights — a one-time purchase, no subscription.
Stop guessing how much to drink. Measure it.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Yoshiaki Hirokawa, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yoshiaki Hirokawa
- Size
- 2.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 32 more
- English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SweatRate Pro $1.99
- Copyright
- © 2026 netflowers