# Guide to Diagnostic Tests vs Dermatology Secrets Plus, 5/E

The clearest difference is price: Guide to Diagnostic Tests at Free against Dermatology Secrets Plus, 5/E's $44.99. Dermatology Secrets Plus, 5/E's advantage is in-app purchases (none vs 1) and iOS requirement (10.0 vs 15.0). On update cadence, ads and device support there is nothing between them.

Guide to Diagnostic Tests is free to download; Dermatology Secrets Plus, 5/E costs $44.99 up front. Guide to Diagnostic Tests sells 1 one-off in-app purchase. Dermatology Secrets Plus, 5/E asks for nothing beyond the download.

Guide to Diagnostic Tests ships an update every 9 months, Dermatology Secrets Plus, 5/E every 17 months. The most recent releases landed on October 27, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Guide to Diagnostic Tests | Dermatology Secrets Plus, 5/E |
| --- | --- | --- |
| Price | **Free** | $44.99 |
| Rating | **[4.6 (35 ratings)](https://appshunter.io/ios/app/guide-to-diagnostic-tests/id910130424/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 17 months |
| Monetization | Free with in-app purchases | — |
| Size | 10 MB | 187 MB |
| Requires iOS | 15.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Usatine & Erickson Media LLC](https://appshunter.io/developer/1466894388) |

## What reviewers say

### Guide to Diagnostic Tests

[App page](https://appshunter.io/ios/app/guide-to-diagnostic-tests/id910130424)

Access evidence-based information on over 450 diagnostic tests, including lab work, imaging, and therapeutic monitoring. This resource helps healthcare professionals quickly find answers to common questions about test selection, interpretation, and patient preparation.

**Highlights:** 450+ diagnostic tests, Evidence-based recommendations, Algorithms, tables, and charts, PubMed links, Custom notes and highlighting, Full-text search, Favorites for bookmarking

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pocket Guide to Diagnostic Tests | $54.99 | one-time |


### Dermatology Secrets Plus, 5/E

[App page](https://appshunter.io/ios/app/dermatology-secrets-plus-5e/id1144576147)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Guide to Diagnostic Tests free?

Guide to Diagnostic Tests is free to download, with in-app purchases available.

### Is Dermatology Secrets Plus, 5/E free?

Dermatology Secrets Plus, 5/E costs $44.99, with no in-app purchases.

### Do Guide to Diagnostic Tests or Dermatology Secrets Plus, 5/E have ads?

Neither Guide to Diagnostic Tests nor Dermatology Secrets Plus, 5/E shows ads.

### Which is updated more often, Guide to Diagnostic Tests or Dermatology Secrets Plus, 5/E?

Guide to Diagnostic Tests ships an update every 9 months, and Dermatology Secrets Plus, 5/E every 17 months. Most recently, Guide to Diagnostic Tests was updated on October 27, 2026 and Dermatology Secrets Plus, 5/E on October 29, 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.*