# Stay Sharp vs Grade 9 Math Practice

The clearest difference is price: Stay Sharp at Free against Grade 9 Math Practice's $0.49. Grade 9 Math Practice's advantage is in-app purchases (none vs 3). On update cadence, ads, device support and iOS requirement there is nothing between them.

Stay Sharp is free to download; Grade 9 Math Practice costs $0.49 up front. Stay Sharp sells 3 in-app purchases, starting at $2.99 per month. Grade 9 Math Practice asks for nothing beyond the download.

Stay Sharp ships an update every 2 weeks, Grade 9 Math Practice fortnightly. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Stay Sharp | Grade 9 Math Practice |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stay-sharp-sharpen-your-mind/id6744872720/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | Freemium | — |
| Size | 80 MB | 25 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Amane soft s.r.o.](https://appshunter.io/developer/1801423544) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### Stay Sharp

[App page](https://appshunter.io/ios/app/stay-sharp-sharpen-your-mind/id6744872720)

Discover fascinating facts and bite-sized trivia personalized to your interests. Learn something new in seconds, delivered daily on your schedule. Turn screen time into brain time with fun, effortless learning.

**Highlights:** Personalized trivia based on interests, Bite-sized facts under 30 seconds, Customizable daily notifications, Fun and effortless learning, Wide range of topics

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stay Sharp Monthly Sub | $2.99 | per month |
| Stay Sharp Annual Sub | $24.99 | per year |
| Stay Sharp Premium Forever | $39.99 | one-time |


### Grade 9 Math Practice

[App page](https://appshunter.io/ios/app/grade-9-math-practice/id6757458527)

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

**In-app purchases:** none


## Frequently asked questions

### Is Stay Sharp free?

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

### Is Grade 9 Math Practice free?

Grade 9 Math Practice costs $0.49, with no in-app purchases.

### Do Stay Sharp or Grade 9 Math Practice have ads?

Neither Stay Sharp nor Grade 9 Math Practice shows ads.

### Which is updated more often, Stay Sharp or Grade 9 Math Practice?

Stay Sharp ships an update every 2 weeks, and Grade 9 Math Practice fortnightly. Most recently, Stay Sharp was updated on October 24, 2026 and Grade 9 Math Practice on October 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.*