# Prismtone vs Index Theremin

The clearest difference is in-app purchases: Index Theremin at none against Prismtone's 2. Index Theremin also leads on ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Prismtone sells 2 in-app purchases, starting at $2.99 per month. Index Theremin asks for nothing beyond the download.

## The numbers

| Metric | Prismtone | Index Theremin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | — |
| Size | 179 MB | 1 MB |
| Requires iOS | **16.2** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Illia Cherednychenko](https://appshunter.io/developer/1874558710) | [NOAH REMI FINN BESENDORFER STAHLHACKE](https://appshunter.io/developer/1836253254) |

## What reviewers say

### Prismtone

[App page](https://appshunter.io/ios/app/prismtone/id6758713499)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prismtone Premium (Monthly) | $2.99 | per month |
| Prismtone Premium (Yearly) | $24.99 | per year |


### Index Theremin

[App page](https://appshunter.io/ios/app/index-theremin/id6818808236)

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

**In-app purchases:** none


## Frequently asked questions

### Is Prismtone free?

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

### Is Index Theremin free?

Index Theremin is free to download, with no in-app purchases.

### Do Prismtone or Index Theremin have ads?

Prismtone shows ads; Index Theremin does not.

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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.*