# TSUNDOKU vs echor｜Idea Notes & Quotes

The clearest difference is in-app purchases: echor｜Idea Notes & Quotes at none against TSUNDOKU's 3. echor｜Idea Notes & Quotes also leads on ads (none vs shown) and iOS requirement (15.1 vs 17.0). TSUNDOKU's advantage is update cadence (every 2 days vs every 8 days). On price and device support there is nothing between them.

Both are free to download. TSUNDOKU sells 3 in-app purchases, starting at $0.99 per month. echor｜Idea Notes & Quotes asks for nothing beyond the download.

TSUNDOKU ships an update every 2 days, echor｜Idea Notes & Quotes every 8 days. The most recent releases landed on October 13, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | TSUNDOKU | echor｜Idea Notes & Quotes |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 8 days |
| Size | 6 MB | 24 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HeberekeKomachi](https://appshunter.io/developer/1868863528) | [dannpen](https://appshunter.io/developer/1896768853) |

## What reviewers say

### TSUNDOKU

[App page](https://appshunter.io/ios/app/tsundoku/id6758754766)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| もっと！TSUNDOKUプラン（月額） | $0.99 | per month |
| もっと！TSUNDOKUプラン（年額） | $11.99 | per year |
| もっと！TSUNDOKUプラン（買い切り） | $24.99 | one-time |


### echor｜Idea Notes & Quotes

[App page](https://appshunter.io/ios/app/echoridea-notes-and-quotes/id6771013945)

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

**In-app purchases:** none


## Frequently asked questions

### Is TSUNDOKU free?

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

### Is echor｜Idea Notes & Quotes free?

echor｜Idea Notes & Quotes is free to download, with no in-app purchases.

### Do TSUNDOKU or echor｜Idea Notes & Quotes have ads?

TSUNDOKU shows ads; echor｜Idea Notes & Quotes does not.

### Which is updated more often, TSUNDOKU or echor｜Idea Notes & Quotes?

TSUNDOKU ships an update every 2 days, and echor｜Idea Notes & Quotes every 8 days. Most recently, TSUNDOKU was updated on October 13, 2026 and echor｜Idea Notes & Quotes on October 11, 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.*