# YPrime eCOA vs Atom5

The clearest difference is rating: YPrime eCOA at 2.8 against Atom5's 2.2. YPrime eCOA also leads on iOS requirement (12.0 vs 15.5). Atom5's advantage is review sentiment (40% vs 13%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

YPrime eCOA holds the better App Store score, 2.8 against 2.2. Both are backed by a comparable volume of ratings — 14 and 13 respectively. Written reviews complicate that: 13% of YPrime eCOA's written reviews are positive against 40% of Atom5's, so the app with the better star average is not the one people write more warmly about.

YPrime eCOA ships an update every 2 months, Atom5 monthly. The most recent releases landed on September 15, 2026 and August 24, 2026 respectively.

## The numbers

| Metric | YPrime eCOA | Atom5 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.8 (14 ratings)](https://appshunter.io/ios/app/yprime-ecoa/id1521277112/reviews)** | [2.2 (13 ratings)](https://appshunter.io/ios/app/atom5/id1537814255/reviews) |
| Number of ratings | **14** | 13 |
| Positive reviews | 12.5% of reviews | **40.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | Free |
| Size | 131 MB | 101 MB |
| Requires iOS | **12.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Y-Prime](https://appshunter.io/developer/872635320) | [Aparito Ltd](https://appshunter.io/developer/1114009046) |

## What reviewers say

### YPrime eCOA

[App page](https://appshunter.io/ios/app/yprime-ecoa/id1521277112)

Access clinical study questionnaires on your personal device. Use your enrollment ID to log in and complete required training. The app reminds you of upcoming questionnaires based on your visit schedule, ensuring compliance with study requirements.

**Highlights:** Access study questionnaires, Personal device access, Enrollment ID login, Study-specific questionnaires, Visit schedule reminders, Compliance tracking

**In-app purchases:** none


### Atom5

[App page](https://appshunter.io/ios/app/atom5/id1537814255)

This platform enables remote patient monitoring for various medical conditions, collecting data to quantify patient well-being and treatment response. It offers new outcome measures for assessing how patients feel, function, and react to therapies.

**Highlights:** Remote patient monitoring, Digital endpoint data collection, Quantifies patient well-being, Measures treatment response, Outcome measures for patient function

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is YPrime eCOA free?

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

### Is Atom5 free?

Atom5 is free to download, with no in-app purchases.

### Which has better reviews, YPrime eCOA or Atom5?

YPrime eCOA is rated higher. YPrime eCOA averages 2.8 out of 5 from 14 ratings, while Atom5 averages 2.2 from 13 ratings.

### Do YPrime eCOA or Atom5 have ads?

Neither YPrime eCOA nor Atom5 shows ads.

### Which is updated more often, YPrime eCOA or Atom5?

YPrime eCOA ships an update every 2 months, and Atom5 monthly. Most recently, YPrime eCOA was updated on September 15, 2026 and Atom5 on August 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.*