# ATD Bookshelf vs WatchNihongo

The clearest difference is price: ATD Bookshelf at Free against WatchNihongo's $2.99. WatchNihongo's advantage is update cadence (monthly vs every 4 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

ATD Bookshelf is free to download; WatchNihongo costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ATD Bookshelf ships an update every 4 months, WatchNihongo monthly. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ATD Bookshelf | WatchNihongo |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/watchnihongo/id6761470087/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | — | Paid |
| Size | 185 MB | 11 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [ASTD](https://appshunter.io/developer/349768874) | [Jorge Lee](https://appshunter.io/developer/1889828290) |

## What reviewers say

### ATD Bookshelf

[App page](https://appshunter.io/ios/app/atd-bookshelf/id6752909753)

**Features:** Vision Pro support

**In-app purchases:** none


### WatchNihongo

[App page](https://appshunter.io/ios/app/watchnihongo/id6761470087)

Master Japanese vocabulary and kanji with a comprehensive flashcard system. Review at your own pace with smart shuffling and track your progress on your wrist or iPhone. Supports English, Portuguese, and Spanish.

**Highlights:** 6,300+ JLPT level flashcards, Kanji, Vocabulary, Kana, and Counters decks, Smart weighted shuffling, Standalone Apple Watch app, Offline content, Progress tracking, Multi-language support

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is ATD Bookshelf free?

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

### Is WatchNihongo free?

WatchNihongo costs $2.99, with no in-app purchases.

### Do ATD Bookshelf or WatchNihongo have ads?

Neither ATD Bookshelf nor WatchNihongo shows ads.

### Which is updated more often, ATD Bookshelf or WatchNihongo?

ATD Bookshelf ships an update every 4 months, and WatchNihongo monthly. Most recently, ATD Bookshelf was updated on October 5, 2026 and WatchNihongo on October 7, 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.*