# Sigmakey vs Grapheme

The clearest difference is in-app purchases: Grapheme at none against Sigmakey's 1. Grapheme also leads on iOS requirement (18.2 vs 26.0). Sigmakey's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Sigmakey sells 1 one-off in-app purchase. Grapheme asks for nothing beyond the download.

## The numbers

| Metric | Sigmakey | Grapheme |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | — | Every 3 days |
| Size | 13 MB | 51 MB |
| Requires iOS | 26.0 | **18.2** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andrii Bashta](https://appshunter.io/developer/1547467775) | [Hsingchien Cheng](https://appshunter.io/developer/1896534780) |

## What reviewers say

### Sigmakey

[App page](https://appshunter.io/ios/app/sigmakey-math-keyboard/id6788025133)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sigmakey Pro | $9.99 | one-time |


### Grapheme

[App page](https://appshunter.io/ios/app/grapheme-unicode-catalog/id6791472634)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sigmakey free?

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

### Is Grapheme free?

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

### Do Sigmakey or Grapheme have ads?

Grapheme shows ads; Sigmakey 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.*