# Numbiro vs JBP I 4th

The clearest difference is price: Numbiro at Free against JBP I 4th's $2.99. Numbiro also leads on rating (4.4 vs 4.0) and update cadence (every 2 months vs every 47 months). JBP I 4th's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Numbiro is free to download; JBP I 4th costs $2.99 up front. Numbiro sells 2 in-app purchases, starting at $0.49 per month. JBP I 4th asks for nothing beyond the download.

Numbiro holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Numbiro has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 75% of Numbiro's written reviews are positive against 100% of JBP I 4th's, so the app with the better star average is not the one people write more warmly about.

Numbiro ships an update every 2 months, JBP I 4th every 47 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Numbiro | JBP I 4th |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.4 (7 ratings)](https://appshunter.io/ios/app/numbiro/id1610373472/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/jbp-i-4th/id6444466245/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 47 months |
| Monetization | **Ad-supported** | Paid |
| Size | 68 MB | 80 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sulisoft Limited](https://appshunter.io/developer/1610373474) | [Association for Japanese-Language Teaching](https://appshunter.io/developer/725965086) |

## What reviewers say

### Numbiro

[App page](https://appshunter.io/ios/app/numbiro/id1610373472)

Practice recognizing spoken Japanese numbers to improve comprehension in everyday conversations. Choose number ranges from single digits to billions and practice Japanese counters. Compete against the clock to get as many correct as possible.

**Highlights:** Listen to spoken Japanese numbers, Identify numbers by listening, Select number ranges, Practice Japanese counters, Timed challenges

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.49 | per month |
| Premium Lifetime | $3.99 | one-time |


### JBP I 4th

[App page](https://appshunter.io/ios/app/jbp-i-4th/id6444466245)

This app provides supplementary study materials for the Japanese for Busy People I Revised 4th Edition textbook. It features flashcards with pronunciation, adjustable playback speed for dialogues and speaking practice, quizzes, and settings for Hiragana/Romaji display.

**Highlights:** Electronic flashcards with pronunciation, Adjustable playback speed for dialogues, Speaking practice exercises, Lesson quizzes, Hiragana/Romaji display options, Progress tracking for memorized words

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

**In-app purchases:** none


## Frequently asked questions

### Is Numbiro free?

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

### Is JBP I 4th free?

JBP I 4th costs $2.99, with no in-app purchases.

### Which has better reviews, Numbiro or JBP I 4th?

Numbiro is rated higher. Numbiro averages 4.4 out of 5 from 7 ratings, while JBP I 4th averages 4.0 from 1 ratings.

### Do Numbiro or JBP I 4th have ads?

Numbiro shows ads; JBP I 4th does not.

### Which is updated more often, Numbiro or JBP I 4th?

Numbiro ships an update every 2 months, and JBP I 4th every 47 months. Most recently, Numbiro was updated on November 3, 2026 and JBP I 4th on November 3, 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.*