# Hydrai vs Hydria

The clearest difference is device support: Hydria at 5 against Hydrai's 2. Hydrai's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Hydrai sells 2 in-app purchases, starting at $0.99 per 7 days and Hydria sells 4 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Hydrai ships an update every 2 weeks, Hydria weekly. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Hydrai | Hydria |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Size | 35 MB | 15 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Kenny Kronholm](https://appshunter.io/developer/1536322233) | [HUGO ANATOLE PAUL MORICEAU](https://appshunter.io/developer/1845368412) |

## What reviewers say

### 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 |


### Hydria

[App page](https://appshunter.io/ios/app/hydria-water-tracker/id6784491822)

**Features:** Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly | $9.99 | per month |
| Yearly | $29.99 | per year |
| Hydria Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Hydrai free?

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

### Is Hydria free?

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

### Do Hydrai or Hydria have ads?

Neither Hydrai nor Hydria shows ads.

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

Hydrai ships an update every 2 weeks, and Hydria weekly. Most recently, Hydrai was updated on October 6, 2026 and Hydria on October 12, 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.*