# KumamonCalc vs 海のカレンダー

The clearest difference is in-app purchases: 海のカレンダー at none against KumamonCalc's 1. KumamonCalc's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. KumamonCalc sells 1 one-off in-app purchase. 海のカレンダー asks for nothing beyond the download.

KumamonCalc ships an update every 3 months, 海のカレンダー every 4 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | KumamonCalc | 海のカレンダー |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/kumamoncalc/id830364492/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free with in-app purchases | — |
| Size | 50 MB | 27 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [woodsmall inc.](https://appshunter.io/developer/708077492) | [Akira Yamamoto](https://appshunter.io/developer/1401669011) |

## What reviewers say

### KumamonCalc

[App page](https://appshunter.io/ios/app/kumamoncalc/id830364492)

A straightforward calculator featuring the popular Kumamon character. It supports basic arithmetic, percentage calculations, and memory functions. Users can customize themes and toggle sound effects.

**Highlights:** Basic arithmetic operations, Percentage calculation, Memory function, Customizable themes, Sound ON/OFF option, 12-digit input support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advertising hide | $4.99 | one-time |


### 海のカレンダー

[App page](https://appshunter.io/ios/app/id1502904539)

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

**In-app purchases:** none


## Frequently asked questions

### Is KumamonCalc free?

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

### Is 海のカレンダー free?

海のカレンダー is free to download, with no in-app purchases.

### Do KumamonCalc or 海のカレンダー have ads?

Both KumamonCalc and 海のカレンダー show ads.

### Which is updated more often, KumamonCalc or 海のカレンダー?

KumamonCalc ships an update every 3 months, and 海のカレンダー every 4 months. Most recently, KumamonCalc was updated on October 23, 2026 and 海のカレンダー 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.*