Exercise
Log every set. Share none of them.
Log workouts with calorie estimates, time sessions with Live Activities, and hit daily targets. All on-device.
Most fitness trackers exist to ship your workouts to a server. LogZero's exercise tracker does the opposite: every workout lives in a local database on your phone, and the timer runs on your device as a Live Activity on your Lock Screen.
Log a run, a ride, a lift, or a workout type you made yourself. LogZero estimates calories from the workout's intensity (its MET value) and your body weight at the time. Daily minutes and calories show up in the dashboard.
Need a timer? Start one and it stays on your Lock Screen until the bell. No leaderboards, no streaks shared, no metrics uploaded.
What you get
Capabilities
Workout log
Type, duration, and time for every session. Bike, hike, martial arts, run, swim, walk, weight lifting, yoga, or other.
Custom workouts
Hide the built-ins you never do. Add up to 30 of your own, each with its own MET value (Pro).
Calorie estimates
MET × your body weight at the time of the workout. Turn on net calories to count them in your food log.
Live Activities
5 to 60 minute timers on the Lock Screen and Dynamic Island (iPhone 14 Pro+).
Apple Health import
Pull in workouts and your Move ring from Apple Health. Read-only, never written back (Pro).
30-day trends
Daily minutes and calories with 7-day rolling average overlays.
In the app
A closer look
Why this is private
Workout data feeds the ad targeting that markets supplements, gym memberships, and athletic gear. LogZero's exercise log makes none of those resales possible.
Read the privacy postureRelated
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Common questions
Common questions about exercise
Can I see the workout timer without keeping the app open?
Yes — when you start a workout timer in LogZero, it pins a Live Activity to your Lock Screen and the Dynamic Island (iPhone 14 Pro and newer). The countdown stays glanceable from any other app you switch to, and a soft bell + haptic fires when the session ends. You can put your phone face-down for the entire workout and still know exactly where you are.
Can I see how exercise affects my mood?
Yes. LogZero's correlations engine computes how your exercise minutes relate to your mood, the same day and the next, and how your weekly activity level relates to weight change. The math runs on your iPhone. Your workout data never leaves the device.
Does LogZero work with Apple Health?
One way only. On Pro, LogZero can import your workouts and Move ring from Apple Health, read-only. It never writes anything back. Imported workouts are stored in LogZero's local database like any other entry, and you can turn the import off anytime.
Get LogZero on your iPhone.
No account. No commitment. Your data stays yours.