# PEM app vs Hydroreader

The clearest difference is in-app purchases: PEM app at none against Hydroreader's 2. PEM app also leads on iOS requirement (12.0 vs 15.6). Hydroreader's advantage is update cadence (fortnightly vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Hydroreader sells 2 in-app purchases, starting at $0.99 per month. PEM app asks for nothing beyond the download.

PEM app ships an update every 4 months, Hydroreader fortnightly. The most recent releases landed on October 9, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | PEM app | Hydroreader |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Size | 35 MB | 57 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rigoberto Arriaza](https://appshunter.io/developer/1172100177) | [Cintelli SA](https://appshunter.io/developer/1828195800) |

## What reviewers say

### PEM app

[App page](https://appshunter.io/ios/app/pem-app/id1229488845)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hydroreader

[App page](https://appshunter.io/ios/app/hydroreader/id6748949693)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Suscripción Plan Pro | $0.99 | per month |
| Plan Pro Subscription | $4.99 | per month |


## Frequently asked questions

### Is PEM app free?

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

### Is Hydroreader free?

Hydroreader is free to download, with in-app purchases available.

### Do PEM app or Hydroreader have ads?

Neither PEM app nor Hydroreader shows ads.

### Which is updated more often, PEM app or Hydroreader?

PEM app ships an update every 4 months, and Hydroreader fortnightly. Most recently, PEM app was updated on October 9, 2026 and Hydroreader on September 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*