# 9th Grade Math Challenge vs K

The clearest difference is review sentiment: 9th Grade Math Challenge at 100% against K's 0%. 9th Grade Math Challenge also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). K's advantage is rating (4.5 vs 3.8) and update cadence (fortnightly vs every 7 months). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. 9th Grade Math Challenge sells 1 one-off in-app purchase and K sells 8 in-app purchases, starting at $1.99 per 3 months. Whichever you choose, the download price is not the number that matters.

K holds the better App Store score, 4.5 against 3.8. That said, the two scores are not equally well evidenced: K has 133 ratings behind it against 12, so its average is the more settled of the two. Written reviews complicate that: 100% of 9th Grade Math Challenge's written reviews are positive against 0% of K's, so the app with the better star average is not the one people write more warmly about.

9th Grade Math Challenge ships an update every 7 months, K fortnightly. The most recent releases landed on June 1, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | 9th Grade Math Challenge | K |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (12 ratings)](https://appshunter.io/ios/app/9th-grade-math-challenge/id1537491129/reviews) | **[4.5 (133 ratings)](https://appshunter.io/ios/app/k-12-math-learning-and-practice/id6446872948/reviews)** |
| Number of ratings | 12 | **133** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 28 MB | 235 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IT365 Solutions Inc](https://appshunter.io/developer/1531416759) | [DEVWORLD VIETAM COMPANY LIMITED](https://appshunter.io/developer/1867412933) |

## What reviewers say

### 9th Grade Math Challenge

[App page](https://appshunter.io/ios/app/9th-grade-math-challenge/id1537491129)

Test your 9th-grade math skills with a challenging game featuring 100 levels and puzzles. Track your progress, share your score with a certificate, and compete with friends. Detailed solutions are provided for better understanding.

**Highlights:** 100 math questions/levels, Math puzzles, Score certificate creation, Friend challenges, Step-by-step solutions

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove all Ads from Math 9 | $0.99 | one-time |


### K

[App page](https://appshunter.io/ios/app/k-12-math-learning-and-practice/id6446872948)

Master K-12 math with interactive games and practice covering algebra, calculus, and more. Features AI-powered explanations, quizzes, and a graphing calculator for on-the-go learning.

**Highlights:** Comprehensive math topics, AI-powered solver with explanations, Interactive quizzes, Smart graphing calculator, Video lessons and tips, Offline practice

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Three Months VIP | $1.99 | per 3 months |
| Learning Premium Monthly Plan | $1.99 | per month |
| One Month VIP | $4.99 | per month |
| Learning Premium HalfYear Plan | $5.99 | per 6 months |
| Learning Premium Annual Plan | $9.99 | per year |
| Six Months VIP | $24.99 | per 6 months |
| 1 Year VIP | $49.99 | per year |
| No ads Pack | $14.99 | one-time |


## Frequently asked questions

### Is 9th Grade Math Challenge free?

9th Grade Math Challenge is free to download, with in-app purchases available.

### Is K free?

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

### Which has better reviews, 9th Grade Math Challenge or K?

K is rated higher. 9th Grade Math Challenge averages 3.8 out of 5 from 12 ratings, while K averages 4.5 from 133 ratings.

### Do 9th Grade Math Challenge or K have ads?

K shows ads; 9th Grade Math Challenge does not.

### Which is updated more often, 9th Grade Math Challenge or K?

9th Grade Math Challenge ships an update every 7 months, and K fortnightly. Most recently, 9th Grade Math Challenge was updated on June 1, 2026 and K on September 24, 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.*