Gym tracker for iPhone
Alterio.
Log the set. Get back to lifting.
Alterio is a workout tracker that gets out of your way. Tap in your weight and reps, let the rest timer run, and see your progress build week after week — all on your device.
Not on the App Store yet. Check back shortly.
iOS 18+ · English & Spanish · kg / lb
Features
Everything you need on the gym floor. Nothing you don’t.
Built around the way you actually train: quick logging, sensible defaults and progress you can feel.
Effortless set logging
Weight and reps in two taps. Bodyweight exercises with added load, a rest timer between sets and keyboard shortcuts that keep you moving.
Routines or a blank slate
Build Push / Pull / Legs style routines and start them with one tap — or begin an empty workout and add exercises as you go.
Muscle heatmap
See which muscles each routine really hits. The map is weighted by volume load, not just the number of sets.
Progress you can scrub
Charts for every exercise, a body-weight timeline and personal records — drag across the chart to read any point in time.
Curated exercise library
A hand-picked catalog with smart search, so you find the right movement in a second instead of scrolling through thousands.
Apple Health, both ways
Reads your workouts and heart rate from Health and writes every completed session back, so your rings and history stay whole.
Local-first, iCloud synced
Everything lives on your iPhone and syncs through your own iCloud account. No accounts to create, no servers in between.
Never lose a session
Close the app mid-workout and pick up exactly where you left off. Edit any completed workout afterwards — sets, weights, notes.
Screens
Designed for the dark corner of the gym.
High contrast, big targets, one-handed. It looks the same at 6 am and 11 pm.
In motion
Thirty seconds, one workout.
Start a routine, log a few sets, finish. That’s the whole loop.
Your data
Your data stays yours.
Alterio has no backend. There is nothing to sign up for, nothing to leak and nothing to sell.
- On your device
- Workouts are stored locally on your iPhone with SwiftData. The app works fully offline.
- Your own iCloud
- Optional sync uses the private CloudKit database tied to your Apple Account. The developer can’t read it.
- Apple Health
- Health data is read and written only with your permission and never leaves your device except through your iCloud.
- No trackers
- No third-party analytics, no ads, no SDKs phoning home. Only Apple’s own aggregated crash reports.