# ISRMWR vs Prelude ePRO

The clearest difference is update cadence: Prelude ePRO at every 11 days against ISRMWR's every 10 months. ISRMWR's advantage is iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

ISRMWR ships an update every 10 months, Prelude ePRO every 11 days. The most recent releases landed on October 25, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | ISRMWR | Prelude ePRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/prelude-epro/id1623896422/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 11 days** |
| Monetization | — | Free |
| Size | 33 MB | 32 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Shenzhen Prime Healthcare Life Science Co., Ltd.](https://appshunter.io/developer/1322195851) | [Prelude Dynamics, LLC](https://appshunter.io/developer/1623896424) |

## What reviewers say

### ISRMWR

[App page](https://appshunter.io/ios/app/isrmwr/id1559861467)

**Features:** macOS Compatibility

**In-app purchases:** none


### Prelude ePRO

[App page](https://appshunter.io/ios/app/prelude-epro/id1623896422)

This app allows clinical trial participants to submit data directly to the electronic data capture system. It removes the need for in-person visits, ensuring continuous data collection from participants.

**Highlights:** Direct data input, Electronic data capture integration, Eliminates on-site visits, Continuous data collection, Mobile clinical trial management

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ISRMWR free?

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

### Is Prelude ePRO free?

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

### Do ISRMWR or Prelude ePRO have ads?

Neither ISRMWR nor Prelude ePRO shows ads.

### Which is updated more often, ISRMWR or Prelude ePRO?

ISRMWR ships an update every 10 months, and Prelude ePRO every 11 days. Most recently, ISRMWR was updated on October 25, 2026 and Prelude ePRO on October 6, 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.*