# Thyroid Navigator vs William Endocrinology Textbook

The clearest difference is ads: Thyroid Navigator at none against William Endocrinology Textbook's shown. William Endocrinology Textbook's advantage is update cadence (every 3 months vs every 21 months) and iOS requirement (13.0 vs 16.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Thyroid Navigator ships an update every 21 months, William Endocrinology Textbook every 3 months. The most recent releases landed on September 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Thyroid Navigator | William Endocrinology Textbook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/thyroid-navigator/id823444434/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 21 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 92 MB | 149 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Kuma Hospital](https://appshunter.io/developer/823444437) | [Skyscape Medpresso Inc](https://appshunter.io/developer/818609416) |

## What reviewers say

### Thyroid Navigator

[App page](https://appshunter.io/ios/app/thyroid-navigator/id823444434)

This app provides a detailed 3D model of the thyroid and surrounding structures. It's designed as a communication and educational tool for medical professionals to explain thyroid diseases and conditions to patients and students.

**Highlights:** Detailed 3D thyroid model, 360-degree rotation, Multiple display patterns (skin, vessels, nerves), Tumor symptom samples, Pre- and post-operative images, Communication tool for medical scenes

**Features:** macOS Compatibility

**In-app purchases:** none


### William Endocrinology Textbook

[App page](https://appshunter.io/ios/app/william-endocrinology-textbook/id1578230520)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Thyroid Navigator free?

Thyroid Navigator is free to download, with no in-app purchases.

### Is William Endocrinology Textbook free?

William Endocrinology Textbook is free to download, with no in-app purchases.

### Do Thyroid Navigator or William Endocrinology Textbook have ads?

William Endocrinology Textbook shows ads; Thyroid Navigator does not.

### Which is updated more often, Thyroid Navigator or William Endocrinology Textbook?

Thyroid Navigator ships an update every 21 months, and William Endocrinology Textbook every 3 months. Most recently, Thyroid Navigator was updated on September 23, 2026 and William Endocrinology Textbook on October 27, 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.*