# Glow vs Hydrai

The clearest difference is in-app purchases: Glow at none against Hydrai's 2. Glow also leads on iOS requirement (13.0 vs 15.1). Hydrai's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Hydrai sells 2 in-app purchases, starting at $0.99 per 7 days. Glow asks for nothing beyond the download.

Glow ships an update every 2 months, Hydrai every 2 weeks. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Glow | Hydrai |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 23 MB | 35 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Comfort Tan](https://appshunter.io/developer/1528928563) | [Kenny Kronholm](https://appshunter.io/developer/1536322233) |

## What reviewers say

### Glow

[App page](https://appshunter.io/ios/app/glow/id6503871289)

**Features:** macOS Compatibility

**In-app purchases:** none


### Hydrai

[App page](https://appshunter.io/ios/app/hydrai/id6748283922)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Monthly | $2.99 | per month |


## Frequently asked questions

### Is Glow free?

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

### Is Hydrai free?

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

### Do Glow or Hydrai have ads?

Neither Glow nor Hydrai shows ads.

### Which is updated more often, Glow or Hydrai?

Glow ships an update every 2 months, and Hydrai every 2 weeks. Most recently, Glow was updated on October 5, 2026 and Hydrai 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.*