Stop guessing
mid cut, bulk, or recomp
The scale lies day to day. Composition is a body-composition tracker for iPhone. It reads the trend behind your weigh-ins, then tells you every week whether you’re holding muscle, dropping fat, or spinning your wheels.
By joining, you agree to receive beta and launch emails from Composition. See our Privacy Policy. Unsubscribe anytime.
You did everything right this week. And the scale went up.
Water, sodium, glycogen, a late meal. Daily weight is mostly noise. Stare at it long enough and you’ll bail on a plan that was actually working, or ride one that isn’t. Serious training deserves a read you can trust.
Three steps from raw data to a straight answer.
Pull weigh-ins and body-fat readings straight from Apple Health, or log them in a tap. No manual spreadsheets.
A 14-day smoothing filter strips out water and day-to-day chaos, leaving the real direction of your lean and fat mass.
Every week, one plain-language read against your goal. On track, off track, or stalled, with the drivers behind it.
It doesn’t need to be.
Knowing you’re 15% body fat instead of 20% doesn’t change anything you’d do tomorrow. Knowing your fat mass has fallen three weeks running while your lean mass held. That changes everything.
A scale that reads two points high reads two points high every day. The error cancels out. The direction survives. That’s the part Composition reads: the direction of travel, not the decimal.
Made for people who actually train.
Not just weight. See muscle and fat move independently, each in its own color: green for gains, warm for fat.
Deltas colored by whether they’re good for your goal, so progress reads at a glance. No math.
Pick your phase and the verdict is read against it. A cut and a bulk are judged by different rules.
Reads your scale and body-fat data automatically, writes composition back. Your smart scale already feeds it.
Trust the trend by default, flip to raw dots when you want to see every data point. Your call.
6 weeks to a year of history: start, now, change, and per-week rate, so you see the whole block.
Read the week. Dig into the arc.
Your smart scale already does the logging.
Composition reads weight and body-fat data from Apple Health the moment you step off the scale, and writes your computed lean and fat mass back. No new hardware, no double entry.
You’ll need a smart scale that writes body-fat data to Apple Health. If yours already syncs, you’re ready.
Your next block
deserves a straight answer.
Composition lands on the App Store this autumn. Get on the list and you’ll be in the beta before it does. The real app, your data, ahead of launch.
By joining, you agree to receive beta and launch emails from Composition. See our Privacy Policy. Unsubscribe anytime.
Stop guessing
mid cut, bulk, or recomp
The scale lies day to day. Composition is a body-composition tracker for iPhone. It reads the trend behind your weigh-ins, then tells you every week whether you’re holding muscle, dropping fat, or spinning your wheels.
By joining, you agree to receive beta and launch emails from Composition. See our Privacy Policy. Unsubscribe anytime.
Wk 5 · Jul 9You did everything right this week. And the scale went up.
Water, sodium, glycogen, a late meal. Daily weight is mostly noise. Stare at it long enough and you’ll bail on a plan that was actually working, or ride one that isn’t. Serious training deserves a read you can trust.
Three steps from raw data to a straight answer.
Pull weigh-ins and body-fat readings straight from Apple Health, or log them in a tap. No manual spreadsheets.
A 14-day smoothing filter strips out water and day-to-day chaos, leaving the real direction of your lean and fat mass.
Every week, one plain-language read against your goal. On track, off track, or stalled, with the drivers behind it.
It doesn’t need to be.
Knowing you’re 15% body fat instead of 20% doesn’t change anything you’d do tomorrow. Knowing your fat mass has fallen three weeks running while your lean mass held. That changes everything.
A scale that reads two points high reads two points high every day. The error cancels out. The direction survives. That’s the part Composition reads: the direction of travel, not the decimal.
Made for people who actually train.
Not just weight. See muscle and fat move independently, each in its own color: green for gains, warm for fat.
Deltas colored by whether they’re good for your goal, so progress reads at a glance. No math.
Pick your phase and the verdict is read against it. A cut and a bulk are judged by different rules.
Reads your scale and body-fat data automatically, writes your computed lean and fat mass back. Your smart scale already feeds it.
Trust the trend by default, flip to raw dots when you want to see every data point. Your call.
6 weeks to a year of history: start, now, change, and per-week rate, so you see the whole block.
Read the week. Dig into the arc.
Your smart scale already does the logging.
Composition reads weight and body-fat data from Apple Health the moment you step off the scale, and writes your computed lean and fat mass back. No new hardware, no double entry.
You’ll need a smart scale that writes body-fat data to Apple Health. If yours already syncs, you’re ready.
Your next block deserves a straight answer.
Composition lands on the App Store this autumn. Get on the list and you’ll be in the beta before it does. The real app, your data, ahead of launch.
By joining, you agree to receive beta and launch emails from Composition. See our Privacy Policy. Unsubscribe anytime.