# Keep vs Hydro Dots

The clearest difference is in-app purchases: Keep at none against Hydro Dots's 4. Keep also leads on ads (none vs shown) and iOS requirement (15.0 vs 26.0). Hydro Dots's advantage is update cadence (daily vs every 2 months). On price and device support there is nothing between them.

Both are free to download. Hydro Dots sells 4 one-off in-app purchases. Keep asks for nothing beyond the download.

Keep ships an update every 2 months, Hydro Dots daily. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Keep | Hydro Dots |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Daily** |
| Size | 26 MB | 43 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [yongheon choi](https://appshunter.io/developer/1747193900) | [Kengo Tate](https://appshunter.io/developer/1458012620) |

## What reviewers say

### Keep

[App page](https://appshunter.io/ios/app/keep-health/id6740777197)

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

**In-app purchases:** none


### Hydro Dots

[App page](https://appshunter.io/ios/app/hydro-dots/id6794577673)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| A drop | $0.99 | one-time |
| A glass | $2.99 | one-time |
| A bottle | $5.99 | one-time |
| Pro — Founding Member | $5.99 | one-time |


## Frequently asked questions

### Is Keep free?

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

### Is Hydro Dots free?

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

### Do Keep or Hydro Dots have ads?

Hydro Dots shows ads; Keep does not.

### Which is updated more often, Keep or Hydro Dots?

Keep ships an update every 2 months, and Hydro Dots daily. Most recently, Keep was updated on October 25, 2026 and Hydro Dots 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.*