| Best for | A weekly plan plus next-session targets, with the reason for each change shown. | Lifters who already follow a program and want the fastest log. |
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| Plan builder | Builds a weekly plan from your goals, experience, equipment, schedule, and session length. Full-body, upper/lower, and push/pull/legs-style splits. | You build your own routines. Optimized for progressive barbell programs such as Starting Strength or StrongLifts 5x5. |
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| How the next weight is set | Sets each target from the sets you log. Reach the top of the rep range and the weight can go up next session. Stall repeatedly and it can recommend a deload. Each target shows why it changed. | You choose it. Strong shows your history, records, and estimated 1RM. |
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| Free version | Subscription required. Check available offers and eligibility in the app. | Yes. Unlimited workouts, limited to 3 custom routines. PRO adds unlimited routines and more statistics. |
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| Logging | Batch logging for repeat sets, rest timer, warmups, effort ratings, notes, swaps, and skips. | Warm-up and plate calculators, rest timer, supersets, RPE, and warm-up, failure, and drop set tags. |
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| Exercise library | 100+ exercises with demonstration videos and step-by-step instructions. | Strength and cardio exercises with instructions and a growing set of animated videos. Add your own. |
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| Progress tracking | Strength Index across five movement patterns, training heatmap, volume, strength, and PR trends, with automatic PR detection. | Personal records, estimated 1RM, volume and 1RM graphs, and body measurements. |
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| Platforms | iPhone and Android. No watch app listed. | iPhone and Android, plus an Apple Watch app that logs with or without your iPhone. |
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| Integrations and export | CSV export of workout history. Separate equipment profiles for each gym. | CSV export and Apple Health support. |
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