# Ciphermail PDF Authenticator vs HDP App

The clearest difference is device support: HDP App at 3 against Ciphermail PDF Authenticator's 1. HDP App also leads on iOS requirement (12.4 vs 18.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Ciphermail PDF Authenticator | HDP App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Size | 37 MB | 19 MB |
| Requires iOS | 18.0 | **12.4** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Ciphermail B.V.](https://appshunter.io/developer/1673495516) | [Moon Gleam LLC](https://appshunter.io/developer/1350505110) |

## What reviewers say

### Ciphermail PDF Authenticator

[App page](https://appshunter.io/ios/app/ciphermail-pdf-authenticator/id1673495514)

**Features:** macOS Compatibility

**In-app purchases:** none


### HDP App

[App page](https://appshunter.io/ios/app/hdp-app/id6474883642)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ciphermail PDF Authenticator free?

Ciphermail PDF Authenticator is free to download, with no in-app purchases.

### Is HDP App free?

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

### Do Ciphermail PDF Authenticator or HDP App have ads?

Neither Ciphermail PDF Authenticator nor HDP App shows ads.

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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.*