# SignatureDYN vs The Keystone

The clearest difference is price: SignatureDYN at $5.99 against The Keystone's $19.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

SignatureDYN costs $5.99 and The Keystone $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | SignatureDYN | The Keystone |
| --- | --- | --- |
| Price | **$5.99** | $19.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 8 MB | 42 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Sorin TASU](https://appshunter.io/developer/1883473854) | [artistpro, LLC](https://appshunter.io/developer/1578409515) |

## What reviewers say

### SignatureDYN

[App page](https://appshunter.io/ios/app/signaturedyn/id6774496784)

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

**In-app purchases:** none


### The Keystone

[App page](https://appshunter.io/ios/app/the-keystone/id6821493009)

**In-app purchases:** none


## Frequently asked questions

### Is SignatureDYN free?

SignatureDYN costs $5.99, with no in-app purchases.

### Is The Keystone free?

The Keystone costs $19.99, with no in-app purchases.

### Do SignatureDYN or The Keystone have ads?

Neither SignatureDYN nor The Keystone shows ads.

---

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