# カスタムアラーム vs Simple Fun Calculator

The clearest difference is iOS requirement: カスタムアラーム at 15.1 against Simple Fun Calculator's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. カスタムアラーム sells 1 one-off in-app purchase and Simple Fun Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

カスタムアラーム ships an update every 4 weeks, Simple Fun Calculator every 3 weeks. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | カスタムアラーム | Simple Fun Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 3 weeks** |
| Size | 39 MB | 1 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TAKUTO YOSHINO](https://appshunter.io/developer/1877756143) | [tsuboi toshihiro](https://appshunter.io/developer/1838670892) |

## What reviewers say

### カスタムアラーム

[App page](https://appshunter.io/ios/app/id6759268514)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Plan | $2.99 | one-time |


### Simple Fun Calculator

[App page](https://appshunter.io/ios/app/simple-fun-calculator/id6806540320)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $1.99 | one-time |


## Frequently asked questions

### Is カスタムアラーム free?

カスタムアラーム is free to download, with in-app purchases available.

### Is Simple Fun Calculator free?

Simple Fun Calculator is free to download, with in-app purchases available.

### Do カスタムアラーム or Simple Fun Calculator have ads?

Neither カスタムアラーム nor Simple Fun Calculator shows ads.

### Which is updated more often, カスタムアラーム or Simple Fun Calculator?

カスタムアラーム ships an update every 4 weeks, and Simple Fun Calculator every 3 weeks. Most recently, カスタムアラーム was updated on October 25, 2026 and Simple Fun Calculator on October 29, 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.*