# PGP HUB vs Formal Languages Basics

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

Both are free to download. PGP HUB sells 2 one-off in-app purchases. Formal Languages Basics asks for nothing beyond the download.

## The numbers

| Metric | PGP HUB | Formal Languages Basics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Size | 85 MB | 38 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [TagMango Inc](https://appshunter.io/developer/1611765353) | [AFTW LLC](https://appshunter.io/developer/1886356149) |

## What reviewers say

### PGP HUB

[App page](https://appshunter.io/ios/app/pgp-hub/id6474617084)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Silver Membership | $59.99 | one-time |
| Gold Membership | $249.99 | one-time |


### Formal Languages Basics

[App page](https://appshunter.io/ios/app/formal-languages-basics/id6772924223)

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

**In-app purchases:** none


## Frequently asked questions

### Is PGP HUB free?

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

### Is Formal Languages Basics free?

Formal Languages Basics is free to download, with no in-app purchases.

### Do PGP HUB or Formal Languages Basics have ads?

Neither PGP HUB nor Formal Languages Basics 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.*