# Underlayer vs Phasm

The clearest difference is in-app purchases: Phasm at none against Underlayer's 1. Underlayer's advantage is device support and iOS requirement (15.1 vs 17.0). On price there is nothing between them.

Both are free to download. Underlayer sells 1 in-app purchase, starting at $2.99 per 7 days. Phasm asks for nothing beyond the download.

## The numbers

| Metric | Underlayer | Phasm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Every 5 months | — |
| Size | 169 MB | 21 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Mihail Rukavishnikov](https://appshunter.io/developer/1648782212) | [Christoph Gaffga](https://appshunter.io/developer/1019565953) |

## What reviewers say

### Underlayer

[App page](https://appshunter.io/ios/app/underlayer/id6753363956)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | per 7 days |


### Phasm

[App page](https://appshunter.io/ios/app/phasm-steganography/id6759446274)

**In-app purchases:** none


## Frequently asked questions

### Is Underlayer free?

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

### Is Phasm free?

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

---

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