# Gravity vs Nihongo Diary

Gravity and Nihongo Diary are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Gravity sells 6 in-app purchases, starting at $4.99 per month and Nihongo Diary sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

Gravity ships an update every 9 days, Nihongo Diary every 10 days. The most recent releases landed on October 16, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Gravity | Nihongo Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (23 ratings)](https://appshunter.io/ios/app/gravity-japanese-immersion/id6769900394/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 10 days |
| Monetization | Free with in-app purchases | — |
| Size | 102 MB | 17 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Heimdall Space Inc.](https://appshunter.io/developer/1896698357) | [Tetta Taguchi](https://appshunter.io/developer/6786536555) |

## What reviewers say

### Gravity

[App page](https://appshunter.io/ios/app/gravity-japanese-immersion/id6769900394)

Learn Japanese by capturing real-world text from your surroundings. This app creates personalized flashcards and study plans based on the vocabulary you encounter daily, making learning practical and context-driven.

**Highlights:** Personalized learning plans, Instant vocabulary extraction from photos, Smart review system, Context-based flashcards, Immersion-focused learning, Daily learning sessions

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| special offer | $4.99 | per month |
| Fluency | $6.99 | per 7 days |
| Immersive Monthly | $8.99 | per month |
| Immersive Monthly | $11.99 | per month |
| Immersion | $14.99 | per month |
| Polyglot | $69.99 | per year |


### Nihongo Diary

[App page](https://appshunter.io/ios/app/nihongo-diary/id6786536553)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus | $9.99 | per month |
| Pro | $19.99 | per month |


## Frequently asked questions

### Is Gravity free?

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

### Is Nihongo Diary free?

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

### Do Gravity or Nihongo Diary have ads?

Neither Gravity nor Nihongo Diary shows ads.

### Which is updated more often, Gravity or Nihongo Diary?

Gravity ships an update every 9 days, and Nihongo Diary every 10 days. Most recently, Gravity was updated on October 16, 2026 and Nihongo Diary on September 25, 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.*