# Physics by Voice vs Notra

The clearest difference is in-app purchases: Physics by Voice at none against Notra's 2. Physics by Voice also leads on device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Notra sells 2 in-app purchases, starting at $8.99 per month. Physics by Voice asks for nothing beyond the download.

## The numbers

| Metric | Physics by Voice | Notra |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 10 days |
| Size | 4 MB | 56 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aishat Perez](https://appshunter.io/developer/1836701734) | [Eclozion](https://appshunter.io/developer/6774210829) |

## What reviewers say

### Physics by Voice

[App page](https://appshunter.io/ios/app/physics-by-voice/id6792253923)

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

**In-app purchases:** none


### Notra

[App page](https://appshunter.io/ios/app/notra-ai-study-notes/id6803191039)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Notra Pro Monthly | $8.99 | per month |
| Notra Pro Yearly | $59.99 | per year |


## Frequently asked questions

### Is Physics by Voice free?

Physics by Voice is free to download, with no in-app purchases.

### Is Notra free?

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

### Do Physics by Voice or Notra have ads?

Neither Physics by Voice nor Notra shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*