Numbers and photos, together.
KATACHI brings your lifts, body weight and progress photos into one calm, private place, so you can look back on how you’ve changed.
Today at a glance.
Your latest weight and the change from last time, body fat, days since your last workout and the past two weeks of training, all on one home screen.
A summary of the month, with workouts, total volume and weight change, sits just below.
Log a set, then move on.
Pick an exercise and your last time appears, with a gentle goal for today, such as “Last time 132.3lb × 11 reps. A little higher today.”
Choose a rest time between sets, from 30 to 150 seconds.
Exercises, by body part.
Chest, back, shoulders and more. Each exercise shows what you did last time, and opens up to your history and estimated 1RM.
You decide which exercises to do. KATACHI remembers past sessions and suggests a gentle next target.
Your body’s changes, as a smooth line.
Look back at weight and body fat over a week, a month, three months, a year or all time, and set a goal weight to see where you stand.
Just the facts, with no pressure.
Load the bar without the math.
Enter a target weight and choose your bar, and the plate calculator shows which plates to put on each side.
It sits alongside the rest timer and the other tools for your session.
Log in seconds
Pick an exercise, enter weight and reps. Or type a line like “Bench Press 135lb 5 reps 3 sets” and it’s read for you. Running is logged too, by distance or by speed, time and incline.
Progress photos
Take front, side and back photos with a self-timer camera, with your last photo faintly overlaid so every shot lines up. Compare before and after, and export a timelapse. Faces can be pixelated automatically when you share.
Track your body
Weight and body fat trends, a goal weight, and optional import from Apple Health.
Monthly Log
A one-card recap of your month, with training days, volume and weight change, made to share or keep.
Tools
Plate calculator, rest timer with Live Activity, estimated 1RM and weekly volume by body part.
Units that fit
kg or lb, cm or ft/in, km or miles, ml or fl oz. Your choice.
Free to start, Pro when you want more.
KATACHI is free to use with the last 10 days visible. KATACHI Pro keeps your full history, with Apple Health import, iCloud backup and shareable Monthly Log cards.
Full history
Look back at everything, not only the last 10 days.
iCloud backup
Back up your records to your own iCloud.
Apple Health import
Bring in data from Apple Health, which is optional.
Monthly Log cards
Share your one-card monthly recap, or keep it.
Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically for the same period unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel any time in Settings > Apple Account > Subscriptions. The one-time purchase is paid once and does not renew. Prices are shown on the App Store in the currency of your country or region. See the Terms of Use for details.
Your body is yours.
Your records and photos stay on your device. There are no ads and no tracking, and an optional Face ID lock is available. KATACHI is a logging tool and does not provide medical advice. Read the Privacy Policy.
Is KATACHI free?
Yes. KATACHI is free to use with the last 10 days visible. KATACHI Pro keeps your full history, with Apple Health import, iCloud backup and shareable Monthly Log cards. Choose a monthly or yearly subscription, or a one-time purchase (pay once, no renewal). Prices are shown on the App Store in the currency of your country or region.
Are my photos and records sent anywhere?
Your records and photos stay on your device. There are no ads and no tracking. Faces can be pixelated automatically when you share a photo.
Can I type a workout instead of tapping?
Yes. Type a line like “Bench Press 135lb 5 reps 3 sets” and it’s read for you.
Does it work with Apple Health?
Yes. KATACHI Pro offers optional import from Apple Health.
Which units can I use?
kg or lb, cm or ft/in, km or miles, and ml or fl oz. You choose.
Does KATACHI give medical advice?
No. KATACHI is a logging tool and does not provide medical advice.