# Guide to Diagnostic Tests vs Digi

The clearest difference is rating: Guide to Diagnostic Tests at 4.6 against Digi's 3.7. Guide to Diagnostic Tests also leads on ratings volume (35 vs 3). Digi's advantage is in-app purchases (none vs 1) and update cadence (every 2 months vs every 9 months). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Guide to Diagnostic Tests sells 1 one-off in-app purchase. Digi asks for nothing beyond the download.

Guide to Diagnostic Tests holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Guide to Diagnostic Tests has 35 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Guide to Diagnostic Tests ships an update every 9 months, Digi every 2 months. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Guide to Diagnostic Tests | Digi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (35 ratings)](https://appshunter.io/ios/app/guide-to-diagnostic-tests/id910130424/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/digi-ddx/id1571762764/reviews) |
| Number of ratings | **35** | 3 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 95 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [OSF Healthcare System](https://appshunter.io/developer/1053621635) |

## 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 |


### Digi

[App page](https://appshunter.io/ios/app/digi-ddx/id1571762764)

Practice diagnostic reasoning with simulated patient cases. Make informed decisions on diagnostic tests and patient management, comparing your efficiency and cost to experienced clinicians. Learn from feedback and access relevant literature.

**Highlights:** Simulated patient cases, Diagnostic test selection, Patient management choices, Cost comparison to experts, Clinical feedback, Hyperlinks to literature

**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 Digi free?

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

### Which has better reviews, Guide to Diagnostic Tests or Digi?

Guide to Diagnostic Tests is rated higher. Guide to Diagnostic Tests averages 4.6 out of 5 from 35 ratings, while Digi averages 3.7 from 3 ratings.

### Do Guide to Diagnostic Tests or Digi have ads?

Neither Guide to Diagnostic Tests nor Digi shows ads.

### Which is updated more often, Guide to Diagnostic Tests or Digi?

Guide to Diagnostic Tests ships an update every 9 months, and Digi every 2 months. Most recently, Guide to Diagnostic Tests was updated on October 24, 2026 and Digi on October 18, 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.*