# 株日記 vs Kosu

The clearest difference is in-app purchases: Kosu at none against 株日記's 3. 株日記's advantage is update cadence (every 6 days vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. 株日記 sells 3 in-app purchases, starting at $0.99 per month. Kosu asks for nothing beyond the download.

株日記 ships an update every 6 days, Kosu every 2 months. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 株日記 | Kosu |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 27.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 2 months |
| Monetization | Freemium | — |
| Size | 135 MB | 4 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Tetsuma Yaguchi](https://appshunter.io/developer/1554826524) | [Hajime Nakamura](https://appshunter.io/developer/1011217140) |

## What reviewers say

### 株日記

[App page](https://appshunter.io/ios/app/id6478166672)

This app helps stock investors track their trades with a simple interface. It automatically calculates profits and losses, and allows for detailed record-keeping of purchase/sale dates, stock prices, and reasons for trades. Users can also create checklists to improve investment decisions.

**Highlights:** Simple trade recording, Automatic profit/loss calculation, Transaction filtering and search, Summary charts and graphs, Investment decision checklists, Data transfer via QR code

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアムサービス（月額プラン） | $0.99 | per month |
| プレミアムサービス（１年プラン） | $9.99 | per year |
| プレミアムサービス（買い切りプラン） | $14.99 | one-time |


### Kosu

[App page](https://appshunter.io/ios/app/kosu/id6793394069)

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

**In-app purchases:** none


## Frequently asked questions

### Is 株日記 free?

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

### Is Kosu free?

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

### Do 株日記 or Kosu have ads?

Neither 株日記 nor Kosu shows ads.

### Which is updated more often, 株日記 or Kosu?

株日記 ships an update every 6 days, and Kosu every 2 months. Most recently, 株日記 was updated on November 8, 2026 and Kosu on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*