# モチタン vs bayes_lab

The clearest difference is in-app purchases: bayes_lab at none against モチタン's 16. bayes_lab also leads on ads (none vs shown) and update cadence (daily vs weekly). モチタン's advantage is iOS requirement (15.0 vs 26.4). On price and device support there is nothing between them.

Both are free to download. モチタン sells 16 in-app purchases, starting at $9.99 per month. bayes_lab asks for nothing beyond the download.

モチタン ships an update weekly, bayes_lab daily. The most recent releases landed on September 24, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | モチタン | bayes_lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (143 ratings)](https://appshunter.io/ios/app/ai/id6451048056/reviews)** | — |
| Number of ratings | **143** | — |
| Positive reviews | 52.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 368 MB | 3 MB |
| Requires iOS | **15.0** | 26.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Astran Inc.](https://appshunter.io/developer/1689875203) | [BeeKnowledgeDesign,Inc.](https://appshunter.io/developer/1659817106) |

## What reviewers say

### モチタン

[App page](https://appshunter.io/ios/app/ai/id6451048056)

This app uses AI to create a fun and effective way to learn English vocabulary. It offers various game modes, including quests and real-time online battles, to help users memorize words through engaging challenges. Track your progress and compete with others to improve your English skills.

**Highlights:** AI-powered personalized learning, Gamified vocabulary quests, Real-time online battles, Progress tracking and visualization, Character collection and customization, Monthly rankings and rewards, Friend challenges and collaboration

**In-app purchases (16)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1ヶ月プラン | $9.99 | per month |
| 1ヶ月プラン（キャンペーン） | $9.99 | per month |
| 12ヶ月プラン（キャンペーン） | $49.99 | per year |
| 12ヶ月プラン | $59.99 | per year |
| ファミリープラン（キャンペーン） | $59.99 | per year |
| ファミリープラン | $69.99 | per year |
| コイン 1,000枚 | $0.49 | one-time |
| モチベイト原石×1 | $0.99 | one-time |
| コイン 5,000枚 | $2.99 | one-time |
| モチベイト原石×6 | $3.99 | one-time |
| モチベイト原石×12 | $5.99 | one-time |
| コイン 20,000枚 | $8.99 | one-time |
| モチベイト原石×30 | $12.99 | one-time |
| モチベイト原石×60 | $24.99 | one-time |
| モチベイト原石×85 | $29.99 | one-time |
| コイン 100,000枚 | $39.99 | one-time |


### bayes_lab

[App page](https://appshunter.io/ios/app/bayes-lab/id6777813012)

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

**In-app purchases:** none


## Frequently asked questions

### Is モチタン free?

モチタン is free to download, with in-app purchases available.

### Is bayes_lab free?

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

### Do モチタン or bayes_lab have ads?

モチタン shows ads; bayes_lab does not.

### Which is updated more often, モチタン or bayes_lab?

モチタン ships an update weekly, and bayes_lab daily. Most recently, モチタン was updated on September 24, 2026 and bayes_lab on September 12, 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.*