# Guide to Diagnostic Tests vs cessa

The clearest difference is rating: Guide to Diagnostic Tests at 4.6 against cessa's 3.0. Guide to Diagnostic Tests also leads on ratings volume (35 vs 2) and chart position (#196 vs unranked). cessa's advantage is in-app purchases (none vs 1) and update cadence (every 4 months vs every 10 months). On price, 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. cessa asks for nothing beyond the download.

Guide to Diagnostic Tests holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Guide to Diagnostic Tests has 35 ratings behind it against 2, so its average is the more settled of the two.

Guide to Diagnostic Tests ships an update every 10 months, cessa every 4 months. The most recent releases landed on September 24, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Guide to Diagnostic Tests | cessa |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (35 ratings)](https://appshunter.io/ios/app/guide-to-diagnostic-tests/id910130424/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/cessa/id1501396487/reviews) |
| Number of ratings | **35** | 2 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 4 months** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#196** | — |
| Size | 10 MB | 10 MB |
| Requires iOS | 15.0 | **12.4** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Cristcot INC.](https://appshunter.io/developer/1501396486) |

## What reviewers say

### Guide to Diagnostic Tests

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

**Currently charting:** #196 Top Grossing · Medical (US App Store)

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 |


### cessa

[App page](https://appshunter.io/ios/app/cessa/id1501396487)

This app serves as a medication reminder for participants in a specific clinical trial. It helps users manage their dosage schedule by allowing them to set reminders and log when they take their medication over a 28-day period.

**Highlights:** Medication reminders, Dosage logging, 28-day study tracking, Clinical trial participation support

**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 cessa free?

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

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

Guide to Diagnostic Tests is rated higher. Guide to Diagnostic Tests averages 4.6 out of 5 from 35 ratings, while cessa averages 3.0 from 2 ratings.

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

Neither Guide to Diagnostic Tests nor cessa shows ads.

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

Guide to Diagnostic Tests ships an update every 10 months, and cessa every 4 months. Most recently, Guide to Diagnostic Tests was updated on September 24, 2026 and cessa on June 4, 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.*