# Happy Kitty Calculator vs Donut timer

The clearest difference is ads: Happy Kitty Calculator at none against Donut timer's shown. Donut timer's advantage is update cadence (every 5 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Happy Kitty Calculator sells 1 one-off in-app purchase and Donut timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Happy Kitty Calculator ships an update every 3 weeks, Donut timer every 5 days. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Happy Kitty Calculator | Donut timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Size | 59 MB | 4 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HUA-TENG HUANG](https://appshunter.io/developer/1780056727) | [Hiroyuki Kako](https://appshunter.io/developer/1581721316) |

## What reviewers say

### Happy Kitty Calculator

[App page](https://appshunter.io/ios/app/happy-kitty-calculator/id6739179959)

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One-time purchase. | $2.99 | one-time |


### Donut timer

[App page](https://appshunter.io/ios/app/donut-timer/id6743337777)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告永久削除 | $2.99 | one-time |


## Frequently asked questions

### Is Happy Kitty Calculator free?

Happy Kitty Calculator is free to download, with in-app purchases available.

### Is Donut timer free?

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

### Do Happy Kitty Calculator or Donut timer have ads?

Donut timer shows ads; Happy Kitty Calculator does not.

### Which is updated more often, Happy Kitty Calculator or Donut timer?

Happy Kitty Calculator ships an update every 3 weeks, and Donut timer every 5 days. Most recently, Happy Kitty Calculator was updated on October 25, 2026 and Donut timer on October 30, 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.*