# Hydrai vs Sip

The clearest difference is in-app purchases: Sip at none against Hydrai's 2. Sip also leads on update cadence (every 2 months vs every 7 months). Hydrai's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

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

Hydrai ships an update every 7 months, Sip every 2 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Hydrai | Sip |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Every 2 months** |
| Size | 36 MB | 28 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Holmstack](https://appshunter.io/developer/1536322233) | [akira kawata](https://appshunter.io/developer/1871950443) |

## What reviewers say

### Hydrai

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

**In-app purchases (2)**

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


### Sip

[App page](https://appshunter.io/ios/app/sip-smart-hydration-tracker/id6758857834)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hydrai free?

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

### Is Sip free?

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

### Do Hydrai or Sip have ads?

Sip shows ads; Hydrai does not.

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

Hydrai ships an update every 7 months, and Sip every 2 months. Most recently, Hydrai was updated on November 5, 2026 and Sip on October 31, 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.*