Tare
Know what your body measurements actually mean.
On the App Store as Body Size
Tare — named for the act of zeroing a scale before you weigh — is a body-measurement and composition tracker that goes past logging. Record your measurements and Tare turns them into real insight: report tiles like BMI, FFMI, RFM, BRI, waist-to-height and symmetry scoring, trend charts with forecasting, and goals tied to the dates that matter. It can track far more than Apple Health has types for. Version 2.0 adds competitions with friends, an Apple Watch app, a Home Screen widget and Siri support. And it's private by construction — no analytics, no tracking, no third-party code and no developer servers; your data lives on your device and in your own iCloud, and the only thing anyone else sees is what you choose to put into a competition.
Runs on iPhone · iPad · Apple Watch
Free to download. Tare Pro — a monthly or annual subscription, or a one-time lifetime purchase — unlocks the Pro reports, including macros and weight projection.
In the UK: Tare Pro £1.99 a month, £12.99 a year, or £29.99 once for lifetime access. Prices differ by country — the App Store shows yours.
Already using Body Size? Tare is the same app, with the same data — just a new name.
- No Kalmaro account, no sign-in
- No ads, no analytics, no tracking
- Logging, charts and Apple Health work offline
- Free to use — Tare Pro is optional
Competitions are the one feature that shares anything beyond your own devices. They sync through your own iCloud to the people you invite, never a Kalmaro server. A competition scored by improvement shares only your change; one scored by final value shares your actual readings, and Tare tells you which before you join.
Free and Pro
Free· Needs Tare Pro
Free
- Every measurement type, and the full log — free
- A chart for each measurement — free
- Goal progress and total progress — free
- Competitions with friends — free
- Progress photos and Private Mode — free
- CSV and photo export — free
Tare Pro
- The deeper report tiles — needs Tare Pro
- Analysis charts: forecasting, correlations, symmetry, body composition, period comparison — needs Tare Pro
- Calorie and macro tools — needs Tare Pro
- Custom measurement types — needs Tare Pro
Screens
On iPhone · 10 screens
Today's overview 
Deeper insights 
Trends over time 
Total progress 
Macro targets 
Weight projection 
Goal progress 
Quick logging 
Compete with friends 
Dark mode
On iPad · 11 screens
Today's overview 
Deeper insights 
Trends, in dark mode 
Total progress 
Macro targets 
Weight projection 
Quick logging 
Compete with friends 
Log a weight 
Goal progress 
Dark mode
Captured from Tare 2.0. Some of what you can see here — including the macros and weight-projection reports — is part of Tare Pro.
Learn more
- Waist-to-height ratio: what it measures and what the numbers meanHow to work it out, how to measure your waist, and the 0.5 and 0.6 boundaries NICE uses.
- The US Navy tape-measure method for estimating body fatThe formula, where the tape goes, and how far to trust the number it gives you.
- Losing weight without losing muscle: tracking lean mass, including on GLP-1 medicinesWhat trials found about the lean share of weight loss, and how to follow your own at home.
- FFMI: what fat-free mass index actually tells youThe number BMI cannot see, and why “25 is the natural limit” is a signpost rather than a wall.
Get Tare
Know what your body measurements actually mean.
Free to download. Tare Pro — a monthly or annual subscription, or a one-time lifetime purchase — unlocks the Pro reports, including macros and weight projection.
In the UK: Tare Pro £1.99 a month, £12.99 a year, or £29.99 once for lifetime access. Prices differ by country — the App Store shows yours.