Shaper AI vs Strong: Which Workout Tracker Is Better for iPhone?
Shaper AI and Strong are both popular iPhone workout trackers for strength training. The short answer: Shaper AI is free with an AI coach and Lock Screen Live Activity — features Strong doesn't offer. Strong has a more established exercise library and a large user community. Which one fits you depends on what you need most.
| Feature | Shaper AI | Strong |
|---|---|---|
| Price | Free — no subscription, no limits | Free tier (3 routines); premium subscription for full access |
| AI coach | Yes — build plans, import from photo, post-workout feedback | No |
| Lock Screen Live Activity | Yes — exercise, sets, timer visible without unlocking | No |
| Auto-rotating plan | Yes — next session always ready automatically | No — manual session selection |
| Rest timers | Yes — automatic, configurable | Yes — manual start |
| Exercise library | Yes — large library, searchable by muscle | Yes — large library, well-established |
| Progress tracking | Yes — full session history, volume trends | Yes — charts and history |
| Import plan from photo | Yes — AI reads any plan image | No |
| Platforms | iOS + Android | iOS + Android |
| Apple Watch support | No | Yes |
| Community / social features | No | Yes — workout sharing |
Price: Shaper AI is completely free
Shaper AI has no subscription, no ads, no in-app purchases, and no feature gating. Every feature is available to every user from day one.
Strong offers a free tier that caps you at 3 workout routines. To use unlimited routines, access advanced analytics, and remove ads, you need Strong Premium — a paid subscription. If you're serious about strength training, you'll hit that limit quickly.
Winner: Shaper AI. There's no cost comparison to make — Shaper AI is free and Strong isn't, at the level most users need.
Lock Screen Live Activity: Shaper AI only
This is Shaper AI's most distinctive feature. Using iOS Live Activities, Shaper AI keeps your current exercise, set number, and rest timer visible on the Lock Screen and Dynamic Island at all times. You can log a completed set and move to the next exercise without ever picking up your phone.
Strong doesn't offer a Lock Screen Live Activity. You need to unlock your phone, open the app, and navigate to log each set. If you prefer staying focused between sets rather than staring at a screen, this difference matters a lot.
Winner: Shaper AI. No other major workout tracker app offers this combination of Live Activity + free pricing.
AI coach: Shaper AI only
Shaper AI includes a conversational AI coach. You can describe your goals, schedule, and equipment, and it will build a complete training plan for you — Push/Pull/Legs, upper/lower, 5-day, whatever you need. You can also snap a photo of an existing plan (from a book, screenshot, or written note) and it imports automatically.
After each workout, the AI coach reviews your performance — volume, intensity, recovery — and tells you what to adjust. It's not a replacement for a personal trainer, but it's a useful thinking partner for self-directed gym-goers.
Strong doesn't include an AI coach. You create and manage your own routines manually.
Winner: Shaper AI for users who want help planning. Strong for users who already know exactly what they're doing and just want a clean log.
Where Strong has an edge
Strong has been around longer and has a larger, more established user community. Apple Watch support is a genuine differentiator — if you log sets from your wrist, Strong is currently the better choice. Strong also has workout sharing and social features that Shaper AI doesn't offer.
Strong's exercise library is well-curated with user-submitted variations and form notes built up over years. Shaper AI's library is comprehensive but newer.
Bottom line
Choose Shaper AI if: you want a free app with no limits, you value training without touching your phone (Lock Screen Live Activity), you want an AI coach to build and adapt your plan, or you're switching from a paid app and want the same quality for free.
Choose Strong if: you use Apple Watch and want wrist-based logging, you value a large established community and workout sharing, or you already have a solid self-designed program and want a clean manual log.
Frequently asked questions
Is Shaper AI free compared to Strong?
Yes. Shaper AI is completely free with no subscription and no limits. Strong has a free tier capped at 3 workout routines, with a premium subscription required for full access.
Does Strong have Lock Screen Live Activity?
No. Strong does not offer a Lock Screen Live Activity. Shaper AI shows your current exercise, set count, and rest timer on the iPhone Lock Screen and Dynamic Island throughout your workout.
Does Strong have an AI coach?
No. Strong does not include an AI coach. Shaper AI has a built-in AI coach that builds your training plan through conversation, imports plans from photos, and gives post-workout performance feedback.
Which app is better for beginners?
Shaper AI is better for beginners — the AI coach builds your training plan from scratch through a conversation, so you don't need to know what split to follow. Strong requires you to create and manage routines yourself.
Free · No subscription · iOS 16+