WeightsBook vs MobyLity
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WeightsBook
This app offers a digital alternative to traditional paper weightlifting journals. It tracks advanced training metrics and provides tools for both beginners and experienced lifters, including client management for trainers.
- Digital weightlifting journal
- Advanced exercise tracking (RIR, RPE, partial reps)
- Superset and drop set support
- Multiple client diaries
- Workout and rest timer
- Workout calendar
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I’ve been lifting for more than 20 years, and I built WeightsBook because I was tired of workout-logging apps that made a simple job feel complicated. With every app I tried, I came away with the same impression: its designers did not understand how lifters actually use a training journal. As a programmer, I decided to build the app I wanted. I returned to what had always worked—pen and paper—and built from there. While training a friend one day, I realized the same journal idea could help personal trainers: a separate weightsbook for every client, all in one app. That led me to add support for multiple weightsbooks, allowing trainers to record each client’s workouts separately and export or share each one. The result is WeightsBook: a modern lifting log that retains the look, feel, and simplicity of a traditional training journal. Its distinctive handwritten style is intentional. Logging a set should feel like writing it down, not operating a dashboard. Within that familiar design, experienced lifters will find detailed tracking for RPE, RIR, supersets, drop sets, and partial reps. If you have ever abandoned a workout app and gone back to a notebook, WeightsBook was made for you.
MobyLity
This app offers guided stretching and mobility routines to improve flexibility, posture, and relieve pain. It features expert-designed exercises with clear instructions, timers, and automatic routine variation to ensure a comprehensive full-body workout. Users can also create custom routines and track their progress.
- Guided stretching routines
- Posture correction
- Flexibility improvement
- Pain relief exercises
- Automatic routine variation
- Custom routine creation
- Equipment-free exercises
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MobyLity is your all-in-one companion for stretching, mobility training, improving flexibility, encouraging healthy joint movement, and achieving daily pain relief. Whether you want to improve posture correction, reduce stiffness, or build a daily stretching habit, MobyLity offers guided routines tailored to your lifestyle — all completely free and ad-free. With expert-designed stretching routines, detailed pictures, a built-in stretching timer, and gentle sounds guiding every move, you always know exactly how to perform each stretch safely. From pain relief stretch sessions to lower back and neck fix routines, and full-body stretching exercises, MobyLity helps improve your movement training and flexibility the easy way. Guided Stretching & Flexibility Training Open any routine and follow step-by-step stretching exercises with: • Timer + sound cues • Clear photos • Detailed instructions • Smooth transitions Designed for all users, from beginners to athletes, the app provides essential movement therapy and gentle physiotherapy exercises for home use. It specializes in Tight hamstrings, hip flexors, shoulders, spine mobility, and back mobility. Giving you everything needed for full-body mobility and daily mobility sessions. Automatic Routine Variation (Stretch the Whole-Body Weekly) Mobylity smartly rotates and stretches each time you complete a session. It removes guesswork so you don’t repeat the same moves every day. Weekly cycles every primary stability, supporting joint mobility, healthy joints, injury prevention, and pain management. Short routines help you stretch the whole body across the week — perfect for busy users who want flexibility training without long-term commitments. Add Stability for Better Mobility At the end of many routines, you’ll find optional core builder and gentle stability exercise moves to support total-body function. Improve stability, posture correction, and reduce the risk of imbalance. Relieve Pain & Improve Posture MobyLity includes targeted routines for: • Back pain stretch & lower back pain relief • Neck pain stretch & neck fix • Hip mobility & tight hips • Knee comfort • Shoulder health • Reduce stiffness • Posture correction Create Your Own Stretching Routines Don’t like the pre-made routines? Mobylity lets you build your own. Choose the duration, and save your perfect home stretching or stretching flexibility routine. Equipment-Based Customization If you don’t have a chair, bench, or tools, MobyLity automatically filters them out. You’ll only see no equipment exercises — ideal for home physio, fitness app users, travelers, and minimalists. Stretch Monthly Stats & Habit Building See how often you stretched, track total time, and build a long-lasting stretching habit. Stats help you: • Manage consistency • Improve motion and fitness • Build mindful routines • Strengthen commitment • Maintain mindful movement Perfect for Home, Office & Travel MobyLity works anywhere: • Home stretching • Office break stretching • Bedtime stretching • Training warm-ups • Post-workout cooldowns • Rehab movement Ideal for flex-fit, inshape, training, fitness your way, and even special goals like lose weight in 30 days or a 90-day challenge support routine (mobility-based). 100% Free — No Ads, No Subscriptions Mobylity is a fully stretching app with no ads, no paywalls, and no hidden subscriptions. Open, stretch, improve flexibility — and enjoy the freedom of a complete mobility training and flexibility app experience without interruptions. Download MobyLity & Start Moving Better Today Feel the difference in flexibility, strength, and posture with simple sessions that fit your day — whether you want guided stretch, stretching guide, movement therapy, or stress-free sessions for motion health. MobyLity is your path to a healthier, more mobile body — one session at a time.
Screenshots
Verdict
The clearest difference is price: MobyLity at Free against WeightsBook's $9.99. MobyLity also leads on rating (5.0 vs 3.0) and ratings volume (57 vs 1). WeightsBook's advantage is update cadence (every 2 weeks vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
MobyLity is free to download; WeightsBook costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
MobyLity holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: MobyLity has 57 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 80% of WeightsBook's written reviews are positive against 100% of MobyLity's.
WeightsBook ships an update every 2 weeks, MobyLity every 2 months. The most recent releases landed on September 5, 2026 and September 15, 2026 respectively.
| Parameter | WeightsBook | MobyLity |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 3.0 (1 ratings) | 5.0 (57 ratings) — better |
| Positive reviews | 80.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 57 — better |
| Update frequency | Every 2 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone | iPhone |
| Requires iOS | 16.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 7 MB | 68 MB |
| Age rating | 4+ | 12+ |
| Developer | Mike Hurwitz | Kenneth Brattli |
Customer experience
WeightsBook
MobyLity
In-app purchases
WeightsBook
No in-app purchases
MobyLity
No in-app purchases









