# Grade 9 Math & Science vs Isosceles Triangle

The clearest difference is price: Isosceles Triangle at Free against Grade 9 Math & Science's $1.99. Isosceles Triangle also leads on update cadence (every 3 weeks vs every 36 months) and iOS requirement (15.0 vs 18.2). Grade 9 Math & Science's advantage is in-app purchases (none vs 8). On ads and device support there is nothing between them.

Isosceles Triangle is free to download; Grade 9 Math & Science costs $1.99 up front. Isosceles Triangle sells 8 one-off in-app purchases. Grade 9 Math & Science asks for nothing beyond the download.

Grade 9 Math & Science ships an update every 36 months, Isosceles Triangle every 3 weeks. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Grade 9 Math & Science | Isosceles Triangle |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 3 weeks** |
| Size | 2 MB | 180 MB |
| Requires iOS | 18.2 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Prachi Pimpalkhare](https://appshunter.io/developer/359099311) | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) |

## What reviewers say

### Grade 9 Math & Science

[App page](https://appshunter.io/ios/app/grade-9-math-and-science/id543527679)

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

**In-app purchases:** none


### Isosceles Triangle

[App page](https://appshunter.io/ios/app/isosceles-triangle/id1568944138)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +30 User Tokens | $0.29 | one-time |
| +1 Convenience Token / 6h, max. +2 | $0.59 | one-time |
| +150 User Tokens | $0.99 | one-time |
| +2 Convenience Tokens / 6h, max. +4 | $0.99 | one-time |
| +300 User Tokens | $1.49 | one-time |
| +4 Convenience Tokens / 6h, max. +8 | $1.59 | one-time |
| Remove Ads | $2.99 | one-time |
| Lifetime Access | $2.99 | one-time |


## Frequently asked questions

### Is Grade 9 Math & Science free?

Grade 9 Math & Science costs $1.99, with no in-app purchases.

### Is Isosceles Triangle free?

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

### Do Grade 9 Math & Science or Isosceles Triangle have ads?

Neither Grade 9 Math & Science nor Isosceles Triangle shows ads.

### Which is updated more often, Grade 9 Math & Science or Isosceles Triangle?

Grade 9 Math & Science ships an update every 36 months, and Isosceles Triangle every 3 weeks. Most recently, Grade 9 Math & Science was updated on October 8, 2026 and Isosceles Triangle 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.*