# Japanese Grammar Rules vs Gravity

The clearest difference is rating: Japanese Grammar Rules at 5.0 against Gravity's 4.2. Japanese Grammar Rules also leads on review sentiment (100% vs 69%). Gravity's advantage is ratings volume (45 vs 3) and iOS requirement (15.1 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Japanese Grammar Rules sells 3 in-app purchases, starting at $4.99 per month and Gravity sells 6 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Japanese Grammar Rules holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Gravity has 45 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of Japanese Grammar Rules's written reviews are positive against 69% of Gravity's.

Japanese Grammar Rules ships an update every 5 days, Gravity weekly. The most recent releases landed on November 5, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Japanese Grammar Rules | Gravity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/japanese-grammar-rules/id6759111803/reviews)** | [4.2 (45 ratings)](https://appshunter.io/ios/app/gravity-language-immersion/id6769900394/reviews) |
| Number of ratings | 3 | **45** |
| Positive reviews | **100.0% of reviews** | 68.8% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 23 MB | 112 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Le Huang](https://appshunter.io/developer/1015141828) | [Heimdall Space Inc.](https://appshunter.io/developer/1896698357) |

## What reviewers say

### Japanese Grammar Rules

[App page](https://appshunter.io/ios/app/japanese-grammar-rules/id6759111803)

This app focuses on understanding Japanese grammar to comprehend spoken and written language. It provides structured lessons and phrase breakdowns to build a strong foundation for learners.

**Highlights:** 67 Structured Lessons, Phrase Breakdowns, Authentic Native Audio, Practical Dialogues, Smart Reference Guides

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $49.99 | per year |
| Lifetime Access | $99.99 | one-time |


### Gravity

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

Learn Japanese and Mandarin Chinese through authentic videos and music. This immersion-first app uses real content, word-synced transcripts, and interactive flashcards to build practical language skills. Enjoy personalized learning tailored to your interests, from anime to C-dramas.

**Highlights:** Learn through native videos and music, Word-synced transcripts with translations, Interactive flashcards with spaced repetition, Karaoke Mode for song-based learning, Personalized learning feed, Supports Japanese and Mandarin Chinese

**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 |


## Frequently asked questions

### Is Japanese Grammar Rules free?

Japanese Grammar Rules is free to download, with in-app purchases available.

### Is Gravity free?

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

### Which has better reviews, Japanese Grammar Rules or Gravity?

Japanese Grammar Rules is rated higher. Japanese Grammar Rules averages 5.0 out of 5 from 3 ratings, while Gravity averages 4.2 from 45 ratings.

### Do Japanese Grammar Rules or Gravity have ads?

Neither Japanese Grammar Rules nor Gravity shows ads.

### Which is updated more often, Japanese Grammar Rules or Gravity?

Japanese Grammar Rules ships an update every 5 days, and Gravity weekly. Most recently, Japanese Grammar Rules was updated on November 5, 2026 and Gravity on November 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*