Simplified gym log.
■ Press. Slide. Logged.
Hold the start button and your routines fan out under your thumb. Slide onto the one you came here to do — one thumb, one motion, from anywhere in the app. Favorites sit closest to your thumb, and you can start empty and add exercises as you go.
■ Lift more. Tap less.
The set ends, the timer starts, and you put the phone down. Rest runs in the Dynamic Island and on the Lock Screen — never unlock to check it, and never open the app to start the next set. Complete a set from the Lock Screen, or expand for the next exercise, sets left, and time remaining.
■ See where the load landed.
Every set you log feeds a per-muscle recovery estimate, drawn on a body map. Not a single "readiness" number — seventeen muscles, each decaying at its own rate.
Which muscle is most fatigued is reasonably reliable. How fatigued it is — the absolute number, the percentage — is a rough guide only. Sleep, nutrition, stress and age are not part of this calculation.
■ Week by week, exercise by exercise.
See your progress, not just your logs. Every week is diffed against the one before it, and what moved is marked ++ or −. Every exercise keeps its own estimated 1RM, top weight and volume over time, with every set you have ever done under the chart.
■ Friends.
Share only a summary of the workout you finished. Friends see that you trained, how long, how many sets, and which muscles — exercise names and weights only if you choose to include them. Your actual records, the sets and the notes, never leave your device. Per-exercise rankings — estimated 1RM, top weight, and sets this week — let you line up against friends who train the same lift.
■ Import anything. Export everything.
Bring your history in from anything — another app's export, a spreadsheet, your own notes. Strong and Hevy CSVs import directly. For anything else, the app hands you a prompt that converts it, and RPE becomes RIR on the way in.
Take it back out as JSON or CSV, as a file or straight to the clipboard in one tap. RIR, notes and warm-up sets all survive the round trip.
It is one SQLite file on your device, with no third-party analytics SDKs. The schemas are public, so anything can read it. Including you.
liftdiff.history/v1 · liftdiff.routine/v1
■ The essentials.
・175 exercises
・RIR & RPE
・Supersets
・Warm-up & drop sets
・Plate calculator
・Rest timer
・Home Screen widgets
・Shareable images
・Per-muscle set counts
・Custom exercises
・Short-version routines
・Favorites
・iCloud sync
・English & 日本語
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
1.4 is about typing less. Add an exercise and it arrives the way you did it last time; add a set and the weight carries over. Week to week is now compared in sets.
Version 1.4
The developer, Yoshiaki Nozaki, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Contact Info
User Content
Identifiers
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Provider
Yoshiaki Nozaki
Size
8.3 MB
Category
Health & Fitness
Compatibility
Requires iOS 26.5 or later.
iPhone Requires iOS 26.5 or later.
Mac Requires macOS 26.5 or later and a Mac with Apple M1 chip or later.