# Whatzit vs Spine Physics

The clearest difference is in-app purchases: Spine Physics at none against Whatzit's 5. Spine Physics also leads on update cadence (every 2 days vs every 6 weeks) and rating (5.0 vs 4.7). Whatzit's advantage is ratings volume (38 vs 1) and chart position (#116 vs unranked). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Whatzit sells 3 in-app purchases, starting at $29.99 per month. Spine Physics asks for nothing beyond the download.

Spine Physics holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Whatzit has 38 ratings behind it against 1, so its average is the more settled of the two.

Whatzit ships an update every 6 weeks, Spine Physics every 2 days. The most recent releases landed on September 12, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Whatzit | Spine Physics |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (38 ratings)](https://appshunter.io/ios/app/whatzit/id1133396295/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spine-physics/id1566693028/reviews)** |
| Number of ratings | **38** | 1 |
| Positive reviews | 81.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#116** | — |
| Size | 33 MB | 10 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Essential Ventures LLC](https://appshunter.io/developer/1133396294) | [Jonathan Nakhla](https://appshunter.io/developer/1554899575) |

## What reviewers say

### Whatzit

[App page](https://appshunter.io/ios/app/whatzit/id1133396295)

**Currently charting:** #116 Top Grossing · Medical (US App Store)

This secure platform aids in spine implant identification by allowing users to post X-rays for crowdsourced feedback. It utilizes proprietary AI-powered redaction technology to automatically remove sensitive text from images directly on your device before sharing.

**Highlights:** Spine implant identification, Crowdsourced X-ray feedback, AI-powered auto-redaction, On-device data processing, Secure image sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Premium | $29.99 | per month |
| Upgrade to Premium | $179.99 | per year |
| Boost Your Post | $14.99 | one-time |


### 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 Whatzit free?

Whatzit 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, Whatzit or Spine Physics?

Spine Physics is rated higher. Whatzit averages 4.7 out of 5 from 38 ratings, while Spine Physics averages 5.0 from 1 ratings.

### Do Whatzit or Spine Physics have ads?

Neither Whatzit nor Spine Physics shows ads.

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

Whatzit ships an update every 6 weeks, and Spine Physics every 2 days. Most recently, Whatzit was updated on September 12, 2026 and Spine Physics on September 10, 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.*