# Physics Heist By Professor vs Grade 9 Science Practice

The clearest difference is in-app purchases: Grade 9 Science Practice at none against Physics Heist By Professor's 1. Grade 9 Science Practice also leads on update cadence (every 11 days vs every 6 months) and iOS requirement (13.0 vs 16.6). On price, ads and device support there is nothing between them.

Both are free to download. Physics Heist By Professor sells 1 one-off in-app purchase. Grade 9 Science Practice asks for nothing beyond the download.

Physics Heist By Professor ships an update every 6 months, Grade 9 Science Practice every 11 days. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Physics Heist By Professor | Grade 9 Science Practice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 11 days** |
| Size | 322 MB | 24 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Spayee Labs](https://appshunter.io/developer/1219640854) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### Physics Heist By Professor

[App page](https://appshunter.io/ios/app/physics-heist-by-professor/id6756004247)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Training Course P | $9.99 | one-time |


### Grade 9 Science Practice

[App page](https://appshunter.io/ios/app/grade-9-science-practice/id6757635913)

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

**In-app purchases:** none


## Frequently asked questions

### Is Physics Heist By Professor free?

Physics Heist By Professor is free to download, with in-app purchases available.

### Is Grade 9 Science Practice free?

Grade 9 Science Practice is free to download, with no in-app purchases.

### Do Physics Heist By Professor or Grade 9 Science Practice have ads?

Neither Physics Heist By Professor nor Grade 9 Science Practice shows ads.

### Which is updated more often, Physics Heist By Professor or Grade 9 Science Practice?

Physics Heist By Professor ships an update every 6 months, and Grade 9 Science Practice every 11 days. Most recently, Physics Heist By Professor was updated on October 24, 2026 and Grade 9 Science Practice on October 20, 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.*