# PSiO vs RedDose

The clearest difference is in-app purchases: PSiO at none against RedDose's 1. PSiO also leads on ads (none vs shown) and iOS requirement (9.0 vs 15.0). RedDose's advantage is update cadence (weekly vs every 11 months). On price and device support there is nothing between them.

Both are free to download. RedDose sells 1 one-off in-app purchase. PSiO asks for nothing beyond the download.

PSiO ships an update every 11 months, RedDose weekly. The most recent releases landed on November 11, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | PSiO | RedDose |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Weekly** |
| Size | 25 MB | 89 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Psychomed.com SA](https://appshunter.io/developer/1318018249) | [SEONYONG LEE](https://appshunter.io/developer/6775892940) |

## What reviewers say

### PSiO

[App page](https://appshunter.io/ios/app/psio/id1318018250)

**Features:** macOS Compatibility

**In-app purchases:** none


### RedDose

[App page](https://appshunter.io/ios/app/reddose-red-light-therapy/id6792493015)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RedDose Pro | $4.99 | one-time |


## Frequently asked questions

### Is PSiO free?

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

### Is RedDose free?

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

### Do PSiO or RedDose have ads?

RedDose shows ads; PSiO does not.

### Which is updated more often, PSiO or RedDose?

PSiO ships an update every 11 months, and RedDose weekly. Most recently, PSiO was updated on November 11, 2026 and RedDose on November 13, 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.*