# メモ帳 vs Missing Number Calculator

The clearest difference is price: メモ帳 at Free against Missing Number Calculator's $0.99. メモ帳 also leads on iOS requirement (15.0 vs 17.0). Missing Number Calculator's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.

メモ帳 is free to download; Missing Number Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

メモ帳 ships an update every 4 days, Missing Number Calculator every 3 days. The most recent releases landed on October 25, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | メモ帳 | Missing Number Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 4 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [matsuda riki](https://appshunter.io/developer/1639765806) | [Infinity Inc. (Apps)](https://appshunter.io/developer/1680741877) |

## What reviewers say

### メモ帳

[App page](https://appshunter.io/ios/app/id6443730092)

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

**In-app purchases:** none


### Missing Number Calculator

[App page](https://appshunter.io/ios/app/missing-number-calculator/id6747973776)

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

**In-app purchases:** none


## Frequently asked questions

### Is メモ帳 free?

メモ帳 is free to download, with no in-app purchases.

### Is Missing Number Calculator free?

Missing Number Calculator costs $0.99, with no in-app purchases.

### Do メモ帳 or Missing Number Calculator have ads?

メモ帳 shows ads; Missing Number Calculator does not.

### Which is updated more often, メモ帳 or Missing Number Calculator?

メモ帳 ships an update every 4 days, and Missing Number Calculator every 3 days. Most recently, メモ帳 was updated on October 25, 2026 and Missing Number Calculator on October 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.*