Leaner - Body Fat Tracker

Your scale jumps 2–4 points a day on water alone. Leaner smooths every reading into one true trend, projects your goal date honestly, and celebrates real progress.

See the trend, not the noise.

Make the most of the smart scale you already own.

A home body-fat scale can swing 2–4 percentage points a day on hydration alone - far more than the real change you're working for. So people give up, sure it isn't working. It usually is. You just couldn't see it.

Leaner does one thing, and does it properly: it turns your noisy daily body-fat readings into a single, stable trend line - so real progress finally shows through.

Why it's different • Trend over readings - the headline number is your smoothed true estimate, never a jumpy raw reading. • One metric, done right - body fat % only. No calorie logging, no macros, no weight-loss guilt. • Apple Health native - reads from any smart scale or caliper app you already use, and writes your manual entries back. Your data is never trapped. • Honest projection - a clearly-labelled estimate of when you'll hit goal at your current rate, with the uncertainty shown, not hidden.

How it works Every reading goes through a smoother that tracks both your level and your direction, so it shows today's real value instead of lagging behind like a 7-day average. Skip a few days, log twice in a morning, fat-finger a reading - Leaner handles it gracefully.

Free forever The smoothed trend, today's number, Apple Health sync, manual entry, your goal and projection, and CSV export - all free, no ads, ever.

Leaner+ Go deeper with advanced smoothing controls, the full Journal with streaks, milestones and celebrations, Home & Lock Screen widgets, category bands and maintenance mode, and Weekly Insights - a calm Sunday recap of your week.

Private by design All your data stays on your device and in Apple Health. No third-party analytics on health values. No tracking. No accounts.

Download Leaner and start seeing the trend.

A note on your health Leaner is a tracking and informational tool, not a medical device, and does not provide medical advice, diagnosis, or treatment. Body-fat readings and trends are estimates and should not be used to make medical decisions. Always consult a qualified healthcare professional before changing your diet, exercise, or health routine, and before acting on anything you see in the app.

Terms of Use (EULA): https://leaner.health/terms Apple standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://leaner.health/privacy