# Spine Physics vs Primal's 3D Spine

The clearest difference is rating: Spine Physics at 5.0 against Primal's 3D Spine's 1.0. Spine Physics also leads on in-app purchases (none vs 1) and update cadence (every 2 days vs every 6 weeks). On price, ratings volume, ads and monetization model there is nothing between them.

Both are free to download. Primal's 3D Spine sells 1 one-off in-app purchase. Spine Physics asks for nothing beyond the download.

Spine Physics holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Spine Physics ships an update every 2 days, Primal's 3D Spine every 6 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Spine Physics | Primal's 3D Spine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spine-physics/id1566693028/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/primals-3d-spine/id1658792190/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 10 MB | 158 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Jonathan Nakhla](https://appshunter.io/developer/1554899575) | [Pharma Intelligence UK Ltd](https://appshunter.io/developer/1678054030) |

## What reviewers say

### Spine Physics

[App page](https://appshunter.io/ios/app/spine-physics/id1566693028)

This app visualizes how obesity affects the body, using a teeter-totter analogy for the spine to explain the importance of maintaining a healthy abdominal girth. It serves as an educational tool for patients, drawing on a surgeon's perspective.

**Highlights:** Obesity impact visualization, Spine teeter-totter analogy, Abdominal girth importance, Surgeon's educational tool, General health information

**Features:** macOS Compatibility

**In-app purchases:** none


### Primal's 3D Spine

[App page](https://appshunter.io/ios/app/primals-3d-spine/id1658792190)

Explore an interactive 3D model of the human spine with detailed anatomical information. This app is designed for medical professionals and students, offering precise visualizations and learning tools.

**Highlights:** Interactive 3D spine model, High-resolution cadaver-based reconstruction, Pre-set anatomical scenes, Layered structure exploration, Systemic content browsing, Save and share custom views, Linked text and 3D models

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Primal's 3D Spine | $39.99 | one-time |


## Frequently asked questions

### Is Spine Physics free?

Spine Physics is free to download, with no in-app purchases.

### Is Primal's 3D Spine free?

Primal's 3D Spine is free to download, with in-app purchases available.

### Which has better reviews, Spine Physics or Primal's 3D Spine?

Spine Physics is rated higher. Spine Physics averages 5.0 out of 5 from 1 ratings, while Primal's 3D Spine averages 1.0 from 1 ratings.

### Do Spine Physics or Primal's 3D Spine have ads?

Neither Spine Physics nor Primal's 3D Spine shows ads.

### Which is updated more often, Spine Physics or Primal's 3D Spine?

Spine Physics ships an update every 2 days, and Primal's 3D Spine every 6 weeks. Most recently, Spine Physics was updated on November 3, 2026 and Primal's 3D Spine on November 3, 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.*