# Prelude ePRO vs ePASSPRO

The clearest difference is iOS requirement: ePASSPRO at 13.0 against Prelude ePRO's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Prelude ePRO ships an update every 11 days, ePASSPRO every 3 weeks. The most recent releases landed on October 6, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Prelude ePRO | ePASSPRO |
| --- | --- | --- |
| 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 11 days** | Every 3 weeks |
| Monetization | Free | — |
| Size | 32 MB | 29 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Prelude Dynamics, LLC](https://appshunter.io/developer/1623896424) | [KCRN Research](https://appshunter.io/developer/1860211351) |

## What reviewers say

### 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


### ePASSPRO

[App page](https://appshunter.io/ios/app/epasspro/id6756346659)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Prelude ePRO free?

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

### Is ePASSPRO free?

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

### Do Prelude ePRO or ePASSPRO have ads?

Neither Prelude ePRO nor ePASSPRO shows ads.

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

Prelude ePRO ships an update every 11 days, and ePASSPRO every 3 weeks. Most recently, Prelude ePRO was updated on October 6, 2026 and ePASSPRO on October 20, 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.*