# ICD 10 Coding Guide vs Ferri's Best Test

The clearest difference is monetization model: Ferri's Best Test at free with in-app purchases against ICD 10 Coding Guide's subscription. Ferri's Best Test also leads on rating (4.8 vs 4.4) and iOS requirement (13.0 vs 15.0). ICD 10 Coding Guide's advantage is ads (none vs shown) and ratings volume (167 vs 26). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. ICD 10 Coding Guide sells 1 in-app purchase, starting at $9.99 per year 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 4.4. That said, the two scores are not equally well evidenced: ICD 10 Coding Guide has 167 ratings behind it against 26, so its average is the more settled of the two.

ICD 10 Coding Guide ships an update every 11 months, Ferri's Best Test every 6 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | ICD 10 Coding Guide | Ferri's Best Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (167 ratings)](https://appshunter.io/ios/app/icd-10-coding-guide-unbound/id1055441695/reviews) | **[4.8 (26 ratings)](https://appshunter.io/ios/app/ferris-best-test-lab-guide/id1243450037/reviews)** |
| Number of ratings | **167** | 26 |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Every 6 months** |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 14 MB | 149 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | 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

### ICD 10 Coding Guide

[App page](https://appshunter.io/ios/app/icd-10-coding-guide-unbound/id1055441695)

Quickly find the latest ICD-10 medical codes with this offline mobile app. Search by code, disease, injury, drug, or keyword. Features include color-coded trees, notes, highlights, and favorites for efficient code assignment.

**Highlights:** Offline ICD-10-CM code access, Rapid search by code, disease, or keyword, Color-keyed Code Trees, Notes and highlights, Favorites for quick access, Companion website

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ICD-10-CM Coding Guide | $9.99 | per year |


### 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 ICD 10 Coding Guide free?

ICD 10 Coding Guide 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, ICD 10 Coding Guide or Ferri's Best Test?

Ferri's Best Test is rated higher. ICD 10 Coding Guide averages 4.4 out of 5 from 167 ratings, while Ferri's Best Test averages 4.8 from 26 ratings.

### Do ICD 10 Coding Guide or Ferri's Best Test have ads?

Ferri's Best Test shows ads; ICD 10 Coding Guide does not.

### Which is updated more often, ICD 10 Coding Guide or Ferri's Best Test?

ICD 10 Coding Guide ships an update every 11 months, and Ferri's Best Test every 6 months. Most recently, ICD 10 Coding Guide was updated on November 2, 2026 and Ferri's Best Test on November 2, 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.*