The doorframe you can take with you.
Record your children's height and weight in seconds and see where they sit on real growth charts. Private, offline, no account.
Coming soon to the App Store for iPhone and iPad.
Real growth charts
CDC and WHO charts, plus your country's charts where they exist. Percentiles from the 3rd to the 97th, from birth to 18.
Made for families
Every child gets their own colour and mascot. Reminders every few weeks, months or once a year.
Private by design
No account, no ads, no tracking. Your data stays on your iPhone, or in your own iCloud.
Pay once
Start free. One lifetime unlock adds unlimited measurements, photos and expected adult height. No subscription.
Pen Marks shows reference charts for information. It is not medical advice; talk to your doctor about your child's growth.