# Muscle & Motion vs aiSpine

The clearest difference is rating: Muscle & Motion at 4.9 against aiSpine's 4.4. Muscle & Motion also leads on ratings volume (681 vs 7). aiSpine's advantage is review sentiment (100% vs 77%) and iOS requirement (15.5 vs 18.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Muscle & Motion sells 3 in-app purchases, starting at $15.00 per month and aiSpine sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Muscle & Motion holds the better App Store score, 4.9 against 4.4. That said, the two scores are not equally well evidenced: Muscle & Motion has 681 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 77% of Muscle & Motion's written reviews are positive against 100% of aiSpine's, so the app with the better star average is not the one people write more warmly about.

Muscle & Motion ships an update monthly, aiSpine every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Muscle & Motion | aiSpine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (681 ratings)](https://appshunter.io/ios/app/muscle-and-motion-posture/id1199500066/reviews)** | [4.4 (7 ratings)](https://appshunter.io/ios/app/aispine-posture-training/id6478812984/reviews) |
| Number of ratings | **681** | 7 |
| Positive reviews | 76.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 193 MB | 220 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Muscle & Motion LTD](https://appshunter.io/developer/1110670112) | [AIH LLC](https://appshunter.io/developer/1439844907) |

## What reviewers say

### Muscle & Motion

[App page](https://appshunter.io/ios/app/muscle-and-motion-posture/id1199500066)

Explore the anatomy and biomechanics of posture with interactive 3D models. Understand muscular patterns, identify common faults, and learn corrective exercises to improve alignment and reduce pain. Ideal for professionals and individuals seeking to enhance their understanding of human movement.

**Highlights:** 3D Postural Analysis Library, Corrective Exercise Library, Biomechanical Principles Visualization, Muscle Activation in 3D, Identification of Postural Faults, Client/Patient Education Tools

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Full Access | $15.00 | per month |
| Yearly Full Access | $89.00 | per year |
| Yearly Subscription Bonus | $89.00 | per year |

**What reviewers like**

- 🚀 Animated anatomy magic
- 👍 Very educational
- 👍 Great body of work
- 👍 Brilliant and very helpful
- 👍 Fabulous and makes you better

**What reviewers complain about**

- 🐛 Doesn't work on iOS 18.3
- 💰 Very expensive

**Reported bugs**

- Paid subscription not working, only free version available
- Login issues

**Requested features**

- Add Russian language
- Add Spanish language


### aiSpine

[App page](https://appshunter.io/ios/app/aispine-posture-training/id6478812984)

This app helps users track their posture and general health by recording posture, pain, and other health-related information. It serves as a personal health log, but users should consult a medical professional for diagnosis and advice.

**Highlights:** Posture recording, Pain feeling log, General health information tracking, Personal health record, Medical consultation reminder

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $2.99 | one-time |
| Annual Membership | $29.99 | one-time |
| Triennial Membership Bundle | $99.99 | one-time |


## Frequently asked questions

### Is Muscle & Motion free?

Muscle & Motion is free to download, with in-app purchases available.

### Is aiSpine free?

aiSpine is free to download, with in-app purchases available.

### Which has better reviews, Muscle & Motion or aiSpine?

Muscle & Motion is rated higher. Muscle & Motion averages 4.9 out of 5 from 681 ratings, while aiSpine averages 4.4 from 7 ratings.

### Do Muscle & Motion or aiSpine have ads?

Neither Muscle & Motion nor aiSpine shows ads.

### Which is updated more often, Muscle & Motion or aiSpine?

Muscle & Motion ships an update monthly, and aiSpine every 3 weeks. Most recently, Muscle & Motion was updated on November 3, 2026 and aiSpine on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*