# Guide to Diagnostic Tests vs Ferri's Best Test

The clearest difference is ads: Guide to Diagnostic Tests at none against Ferri's Best Test's shown. Ferri's Best Test's advantage is rating (4.8 vs 4.6) and iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

Both are free to download. Guide to Diagnostic Tests sells 1 one-off in-app purchase and Ferri's Best Test sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Ferri's Best Test holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 35 and 26 respectively.

Guide to Diagnostic Tests ships an update every 9 months, Ferri's Best Test every 6 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Guide to Diagnostic Tests | Ferri's Best Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (35 ratings)](https://appshunter.io/ios/app/guide-to-diagnostic-tests/id910130424/reviews) | **[4.8 (26 ratings)](https://appshunter.io/ios/app/ferris-best-test-lab-guide/id1243450037/reviews)** |
| Number of ratings | **35** | 26 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Every 6 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 10 MB | 149 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Skyscape Medpresso Inc](https://appshunter.io/developer/818609416) |

## 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 |


### Ferri's Best Test

[App page](https://appshunter.io/ios/app/ferris-best-test-lab-guide/id1243450037)

This medical reference app provides guidance on laboratory and imaging approaches for over 400 tests and 230 diseases. It features interactive flowcharts, IU units, and concise clinical material to aid in test selection and diagnostic skills.

**Highlights:** Over 400+ tests and labs, Guidance on radio-logic & laboratory approaches, 230+ common diseases, Interactive flowcharts, IU units for all tests, SmartSearch technology

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ferri's Best Test - Lab & Diag | $40.99 | one-time |


## Frequently asked questions

### Is Guide to Diagnostic Tests free?

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

### Is Ferri's Best Test free?

Ferri's Best Test is free to download, with in-app purchases available.

### Which has better reviews, Guide to Diagnostic Tests or Ferri's Best Test?

Ferri's Best Test is rated higher. Guide to Diagnostic Tests averages 4.6 out of 5 from 35 ratings, while Ferri's Best Test averages 4.8 from 26 ratings.

### Do Guide to Diagnostic Tests or Ferri's Best Test have ads?

Ferri's Best Test shows ads; Guide to Diagnostic Tests does not.

### Which is updated more often, Guide to Diagnostic Tests or Ferri's Best Test?

Guide to Diagnostic Tests ships an update every 9 months, and Ferri's Best Test every 6 months. Most recently, Guide to Diagnostic Tests was updated on October 27, 2026 and Ferri's Best Test on October 24, 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.*