LiftDiff
Gym Note, Workout Tracker
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Lift more than last time. A workout log for strength training that shows your progress. Free, no account. Friends' workouts reach your feed and widget on their own.
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 hasn’t received enough ratings or reviews to display an overview.
Friends, finished — plus new Home Screen widgets and tools for talking to your AI.
■ Home Screen widgets
・New "Friend code" widget: your QR and your friends' latest workouts, right on the Home Screen. The large size adds a heatmap of your recent training next to the QR
・Also new: a feed-only widget that lists your friends' workouts (medium & large)
・The feed and widgets stay up to date even while the app is closed
■ Friends
・Set an avatar (a single emoji). It shows in the feed, the friends list and the rankings
・Tap a name or avatar to open their page — all-time totals, consistency, and their recent workouts in the same cards as the feed
・Tap a reaction to see who reacted
・Reactions now appear the moment you tap
■ Ask your AI
・New in export: "Summary for AI". Your entire history folds into a text one-tenth the size of the JSON — paste it into the AI of your choice and ask how your training is going. Two ranges: last 12 weeks, or all time
・There is also a prompt that asks an AI to build you a routine. Whatever comes back imports directly
・Neither one makes a network call. The app only hands you the prompt
■ Share image
・Rebuilt the card face: your avatar, name and date, a clear / frosted / solid background, and a switch for showing weights
■ Everything else
・Fixed several small bugs
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
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yoshiaki Nozaki
- Size
- 7.8 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.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
User-Generated Content
- Copyright
- © 2026 Yoshiaki Nozaki
