# Happy Kitty Calculator vs Customizable calculator

The clearest difference is in-app purchases: Customizable calculator at none against Happy Kitty Calculator's 1. Customizable calculator also leads on update cadence (every 2 days vs every 3 weeks) and iOS requirement (13.0 vs 15.6). Happy Kitty Calculator's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Happy Kitty Calculator sells 1 one-off in-app purchase. Customizable calculator asks for nothing beyond the download.

Happy Kitty Calculator ships an update every 3 weeks, Customizable calculator every 2 days. The most recent releases landed on November 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Happy Kitty Calculator | Customizable calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 59 MB | 202 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HUA-TENG HUANG](https://appshunter.io/developer/1780056727) | [Hisashi Yoshizawa](https://appshunter.io/developer/1770019728) |

## 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 |


### Customizable calculator

[App page](https://appshunter.io/ios/app/customizable-calculator/id6740001661)

**In-app purchases:** none


## Frequently asked questions

### Is Happy Kitty Calculator free?

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

### Is Customizable calculator free?

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

### Do Happy Kitty Calculator or Customizable calculator have ads?

Customizable calculator shows ads; Happy Kitty Calculator does not.

### Which is updated more often, Happy Kitty Calculator or Customizable calculator?

Happy Kitty Calculator ships an update every 3 weeks, and Customizable calculator every 2 days. Most recently, Happy Kitty Calculator was updated on November 8, 2026 and Customizable calculator on October 25, 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.*