# SPHERE OS vs Learn Japanese Fast

The clearest difference is rating: Learn Japanese Fast at 5.0 against SPHERE OS's 1.0. Learn Japanese Fast also leads on update cadence (every 3 days vs every 3 weeks). SPHERE OS's advantage is in-app purchases (none vs 3) and device support (3 vs 1). On price, ratings volume, ads and iOS requirement there is nothing between them.

Both are free to download. Learn Japanese Fast sells 3 in-app purchases, starting at $4.99 per 7 days. SPHERE OS asks for nothing beyond the download.

Learn Japanese Fast holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

SPHERE OS ships an update every 3 weeks, Learn Japanese Fast every 3 days. The most recent releases landed on October 30, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | SPHERE OS | Learn Japanese Fast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/sphere-os/id1579848717/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/learn-japanese-fast/id6471037599/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 951 MB | 3 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [LNSOFT](https://appshunter.io/developer/1137904140) | [Gabe Rogers](https://appshunter.io/developer/1584630702) |

## What reviewers say

### SPHERE OS

[App page](https://appshunter.io/ios/app/sphere-os/id1579848717)

Explore Earth's dynamic systems with an interactive digital globe. Visualize real-time data like cloud cover, seismic activity, and pollution, and engage through voice commands, gestures, and augmented reality. This tool transforms learning about our planet for educational and exhibition purposes.

**Highlights:** Real-time scientific data visualization, Voice recognition for navigation, Gesture-based globe control, Augmented Reality (AR) mode, QR code content integration, Customizable playlists for presentations

**Features:** macOS Compatibility

**In-app purchases:** none


### Learn Japanese Fast

[App page](https://appshunter.io/ios/app/learn-japanese-fast/id6471037599)

Master Japanese vocabulary with science-based spaced repetition. Expand your word bank with over 1,000 common terms and track your daily study progress. This tool is designed to boost your learning efficiency and communication skills.

**Highlights:** Expand vocabulary with 1,000+ common words, Science-based spaced repetition for efficient learning, Track daily study progress, Learn Hiragana, Katakana, and Kanji, Boost communication skills

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 週間 | $4.99 | per 7 days |
| 月額 | $15.99 | per month |
| 年間 | $48.99 | per year |


## Frequently asked questions

### Is SPHERE OS free?

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

### Is Learn Japanese Fast free?

Learn Japanese Fast is free to download, with in-app purchases available.

### Which has better reviews, SPHERE OS or Learn Japanese Fast?

Learn Japanese Fast is rated higher. SPHERE OS averages 1.0 out of 5 from 2 ratings, while Learn Japanese Fast averages 5.0 from 1 ratings.

### Do SPHERE OS or Learn Japanese Fast have ads?

Neither SPHERE OS nor Learn Japanese Fast shows ads.

### Which is updated more often, SPHERE OS or Learn Japanese Fast?

SPHERE OS ships an update every 3 weeks, and Learn Japanese Fast every 3 days. Most recently, SPHERE OS was updated on October 30, 2026 and Learn Japanese Fast on October 5, 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.*