# Spine vs Spine Physics

The clearest difference is in-app purchases: Spine Physics at none against Spine's 1. Spine Physics also leads on update cadence (every 2 days vs every 26 months). Spine's advantage is ratings volume (59 vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. Spine sells 1 in-app purchase, starting at $1.99 per year. Spine Physics asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Spine against 5.0 for Spine Physics. That said, the two scores are not equally well evidenced: Spine has 59 ratings behind it against 1, so its average is the more settled of the two.

Spine ships an update every 26 months, Spine Physics every 2 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Spine | Spine Physics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (59 ratings)](https://appshunter.io/ios/app/spine-whats-the-data/id934859379/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spine-physics/id1566693028/reviews)** |
| Number of ratings | **59** | 1 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 2 days** |
| Monetization | Subscription | **Free** |
| Size | 20 MB | 10 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Limbix LLC](https://appshunter.io/developer/490505327) | [Jonathan Nakhla](https://appshunter.io/developer/1554899575) |

## What reviewers say

### Spine

[App page](https://appshunter.io/ios/app/spine-whats-the-data/id934859379)

Access essential medical literature and randomized trials in an easy-to-read format. This subscription-based service provides immediate access to updated content, helping medical professionals and students quickly review key studies and enhance their knowledge.

**Highlights:** Review seminal studies quickly, Server-based platform for immediate updates, Annual subscription service, Covers surgical and non-surgical management, Citation information for further study, Updated every 1-3 months

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $1.99 | per year |


### 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


## Frequently asked questions

### Is Spine free?

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

### Is Spine Physics free?

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

### Which has better reviews, Spine or Spine Physics?

Spine Physics is rated higher. Spine averages 4.9 out of 5 from 59 ratings, while Spine Physics averages 5.0 from 1 ratings.

### Do Spine or Spine Physics have ads?

Neither Spine nor Spine Physics shows ads.

### Which is updated more often, Spine or Spine Physics?

Spine ships an update every 26 months, and Spine Physics every 2 days. Most recently, Spine was updated on November 1, 2026 and Spine Physics 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.*