# Karusphère vs 990prep

The clearest difference is in-app purchases: Karusphère at none against 990prep's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 990prep sells 2 in-app purchases, starting at $44.99 per month. Karusphère asks for nothing beyond the download.

Karusphère ships an update every 2 weeks, 990prep every 9 days. The most recent releases landed on October 4, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Karusphère | 990prep |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 32 MB | 89 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [J2R CONSULTING](https://appshunter.io/developer/1476067808) | [Justin De Sio](https://appshunter.io/developer/1881405592) |

## What reviewers say

### Karusphère

[App page](https://appshunter.io/ios/app/karusphere/id1637340643)

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

**In-app purchases:** none


### 990prep

[App page](https://appshunter.io/ios/app/990prep-toeic-training/id6759878981)

Prepare for the TOEIC® exam with a comprehensive training app. It offers numerous practice exercises, vocabulary flashcards, and grammar lessons designed to improve your score. Instant feedback helps you learn from mistakes.

**Highlights:** 240 Practice Exercises, 1,000+ Vocabulary Flashcards, 100+ Grammar Lessons, Instant Corrections, Progress Tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $44.99 | per month |
| Annual Premium | $89.99 | per year |


## Frequently asked questions

### Is Karusphère free?

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

### Is 990prep free?

990prep is free to download, with in-app purchases available.

### Do Karusphère or 990prep have ads?

Neither Karusphère nor 990prep shows ads.

### Which is updated more often, Karusphère or 990prep?

Karusphère ships an update every 2 weeks, and 990prep every 9 days. Most recently, Karusphère was updated on October 4, 2026 and 990prep on October 11, 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.*