# Hydro Dots vs Caffeine Clock

The clearest difference is ads: Caffeine Clock at none against Hydro Dots's shown. Caffeine Clock also leads on iOS requirement (18.0 vs 26.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Hydro Dots sells 4 one-off in-app purchases and Caffeine Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Hydro Dots ships an update daily, Caffeine Clock every 2 days. Both last shipped on November 13, 2026.

## The numbers

| Metric | Hydro Dots | Caffeine Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 2 days |
| Size | 43 MB | 6 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Kengo Tate](https://appshunter.io/developer/1458012620) | [kazunari aoki](https://appshunter.io/developer/6774180811) |

## What reviewers say

### 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 |


### Caffeine Clock

[App page](https://appshunter.io/ios/app/caffeine-clock-bedtime/id6796871272)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caffeine Clock Pro | $9.99 | one-time |


## Frequently asked questions

### Is Hydro Dots free?

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

### Is Caffeine Clock free?

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

### Do Hydro Dots or Caffeine Clock have ads?

Hydro Dots shows ads; Caffeine Clock does not.

### Which is updated more often, Hydro Dots or Caffeine Clock?

Hydro Dots ships an update daily, and Caffeine Clock every 2 days. Most recently, Hydro Dots was updated on November 13, 2026 and Caffeine Clock 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.*