AI fitness coach
The coach that actually remembers you.
Stelvo is an iPhone app for people who lift weights: an AI fitness coach that scores your physique from one photo, builds your workouts and adapts them every session, and remembers what you tell it. Talk to it mid-workout. Get a real answer in two seconds.
Physique Score
One full-body photo. Ten scores — muscularity, leanness, symmetry, and more — charted over time so you can watch them climb.
Persistent memory
Tell it once about your knee, your home gym, your travel weeks. It remembers — and you can see exactly what's stored.
Plans that adapt
Skipped legs three weeks in a row? It rebalances. PR'd your bench? It updates the next session's load.
Talk while you train
"Swap incline press, bench is taken" — the coach edits your live workout on the spot. Never done a lift? Ask what weight to start with and get a real number.
Works offline
Basement gym, no bars? Start, log, and finish workouts offline — everything syncs when you're back.
Stats that mean something
Volume trends per body part. PR cadence — with a proper celebration when you set one. Real numbers, not vanity dashboards.
Know exactly where your physique stands.
Take one full-body photo and get your Physique Score — an overall rating out of 10, an estimated body fat percentage, and a breakdown across the dimensions that actually shape how you look. Re-scan as you train and watch every line trend up.
Estimates from a single photo — approximate, not medical advice. Your scan photos are yours; delete them anytime.
How Stelvo compares.
Strong and Hevy are great loggers, and Hevy's Pro trainer adds simple progression. Neither will talk to you. Stelvo is the AI coach your training log was always missing.
| What you get | Stelvo | Strong | Hevy |
|---|---|---|---|
| Workout tracking | ✓ | ✓ | ✓ |
| AI coach you can talk to | ✓ | — | — |
| Physique score from a photo | ✓ | — | — |
| Plans that adapt to your history | ✓ | — | Pro only (simple auto-progression) |
| Persistent memory across sessions | ✓ | — | — |
| Voice input mid-set | ✓ | — | — |
| Volume + PR analytics | ✓ | ✓ | ✓ |
| Social feed / followers | — (focused, not social) | — | ✓ |
| Price | $9.99/mo · $59.99/yr | Free (3 routines); Pro $4.99/mo · $29.99/yr | Free (4 routines); Pro $2.99/mo · $23.99/yr |
Strong and Hevy facts checked against their own pages on October 22, 2026.
Full comparison with Fitbod, Caliber, Future, Freeletics and JuggernautAI →
Built for lifters, not feature lists.
Most fitness apps are silent libraries — you log a workout, the app says "great job," and forgets you exist until the next session. Stelvo is the opposite. If you train 3+ days a week and care about progressive overload, this is for you.
$9.99/month or $59.99/year
Cancel anytime from your Apple ID settings.
Download Stelvo →