# SagittalMeter Lite vs Primal's 3D Spine

The clearest difference is review sentiment: SagittalMeter Lite at 100% against Primal's 3D Spine's 0%. SagittalMeter Lite also leads on rating (5.0 vs 1.0) and in-app purchases (none vs 1). Primal's 3D Spine's advantage is update cadence (every 6 weeks vs every 11 months). 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. SagittalMeter Lite asks for nothing beyond the download.

SagittalMeter Lite holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 100% of SagittalMeter Lite's written reviews are positive against 0% of Primal's 3D Spine's.

SagittalMeter Lite ships an update every 11 months, Primal's 3D Spine every 6 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | SagittalMeter Lite | Primal's 3D Spine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sagittalmeter-lite/id963720300/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/primals-3d-spine/id1658792190/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 32 MB | 158 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Jean-Charles LE HUEC](https://appshunter.io/developer/1880028964) | [Pharma Intelligence UK Ltd](https://appshunter.io/developer/1678054030) |

## What reviewers say

### SagittalMeter Lite

[App page](https://appshunter.io/ios/app/sagittalmeter-lite/id963720300)

This application assists medical practitioners in measuring crucial sagittal balance parameters directly from sagittal X-rays. It helps analyze spine problems and pre-operative planning by calculating pelvic incidence, pelvic tilt, and sacral slope.

**Highlights:** Measure sagittal balance parameters, Directly use phone on X-rays, Calculate Pelvic Incidence (PI), Calculate Pelvic Tilt (PT), Calculate Sacral Slope (SS), Aid in spine problem analysis

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

**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 SagittalMeter Lite free?

SagittalMeter Lite 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, SagittalMeter Lite or Primal's 3D Spine?

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

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

Neither SagittalMeter Lite nor Primal's 3D Spine shows ads.

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

SagittalMeter Lite ships an update every 11 months, and Primal's 3D Spine every 6 weeks. Most recently, SagittalMeter Lite was updated on October 24, 2026 and Primal's 3D Spine on October 25, 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.*