RefineSimple is the strength-training app for people who take it seriously — with a plan that adapts to your body instead of forcing you through a fixed scheme.
ADAPTIVE
Your week isn't a rigid calendar, it's a pool of sessions. Each morning your readiness score picks the best one for today: recovered → your heavy day, wiped → something lighter or a real rest day, no guilt. Underneath runs a real mesocycle with deload weeks and automatic progression that follows your sets.
EXPLAINABLE
No black box. Every recommendation names the strongest reason with a number — "HRV below baseline, sleep −21% → less volume today." You always understand why the app suggests something.
YOU STAY IN CONTROL
The app never says "don't train." It shows you why it recommends an adjustment today — accept or keep the original plan, one tap.
READINESS THAT'S YOURS
Your readiness score comes from HRV, sleep, resting heart rate and training load, straight from Apple Health. Instead of generic numbers, the app learns your personal typical range, shows the real trend and a 14-day history — reconstructed on first launch.
YOUR AI COACH
A coach that knows your recent sessions, your readiness score and every set you've logged — and answers based on them. It swaps an exercise when a joint acts up, cuts volume when needed, and explains its decisions. No motivational fluff.
PROGRESS, HONESTLY COUNTED
Automatic PR detection via estimated 1RM — a rep PR counts too (100 kg × 8 instead of × 5). e1RM trend per exercise, tonnage and volume per muscle group against science-based landmarks.
No nutrition tracking, no social features, no fluff. Just intelligent strength training that adapts to you.
RefineSimple Pro unlocks the AI coach and all workouts.
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The plan generator got an upgrade:
- Fresher plans: the generator now draws on all 207 exercises — every generation rotates exercises, only your main lifts stay fixed as progression anchors.
- Swap exercises: tap any exercise in your plan and swap it for one of three suggestions or any alternative for the same muscle group — applies to all open sessions, your history stays untouched.
- Muscle focus now really works: "Emphasize" adds matching exercises (e.g. core), "Strongly reduce" removes isolation work entirely.
- Choose your plan length: 4–10 weeks, right when generating.
- Mass & cut: main lifts now in the classic 8–12 rep range.
- Reconnect Apple Health: new iPhone? Profile → App → Apple Health checks the connection and re-requests permissions.
- Fixes: muscle heatmap updates right after your session, "Apply" on the set target fills in all values, the coach input field stays visible above the keyboard.
Feedback? feedback@refinesimple.com
Version 1.5.1
The developer, Nathan Seefelder, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
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Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Nathan Seefelder
Size
91.4 MB
Category
Health & Fitness
Compatibility
Requires iOS 17.6 or later.
iPhone Requires iOS 17.6 or later.
Mac Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.