# Diary Notes vs Duodecuple Calc

The clearest difference is in-app purchases: Duodecuple Calc at none against Diary Notes's 1. Duodecuple Calc also leads on iOS requirement (15.8.3 vs 26.0). Diary Notes's advantage is ads (none vs shown) and update cadence (every 4 days vs every 2 weeks). On price and device support there is nothing between them.

Both are free to download. Diary Notes sells 1 in-app purchase, starting at $0.99 per month. Duodecuple Calc asks for nothing beyond the download.

Diary Notes ships an update every 4 days, Duodecuple Calc every 2 weeks. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Diary Notes | Duodecuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Size | 171 MB | 36 MB |
| Requires iOS | 26.0 | **15.8.3** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [tadahiro mori](https://appshunter.io/developer/1541301326) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### Diary Notes

[App page](https://appshunter.io/ios/app/diary-notes-handwritten/id6479974763)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額プラン | $0.99 | per month |


### Duodecuple Calc

[App page](https://appshunter.io/ios/app/duodecuple-calc/id6742208421)

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

**In-app purchases:** none


## Frequently asked questions

### Is Diary Notes free?

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

### Is Duodecuple Calc free?

Duodecuple Calc is free to download, with no in-app purchases.

### Do Diary Notes or Duodecuple Calc have ads?

Duodecuple Calc shows ads; Diary Notes does not.

### Which is updated more often, Diary Notes or Duodecuple Calc?

Diary Notes ships an update every 4 days, and Duodecuple Calc every 2 weeks. Most recently, Diary Notes was updated on October 9, 2026 and Duodecuple Calc on October 10, 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.*