# Secret Message Exchange vs Underlayer

The clearest difference is ads: Secret Message Exchange at none against Underlayer's shown. Secret Message Exchange also leads on iOS requirement (12.2 vs 15.1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Secret Message Exchange sells 1 one-off in-app purchase and Underlayer sells 1 in-app purchase, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Secret Message Exchange | Underlayer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 5 months |
| Size | 5 MB | 169 MB |
| Requires iOS | **12.2** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Import EV](https://appshunter.io/developer/551601250) | [Mihail Rukavishnikov](https://appshunter.io/developer/1648782212) |

## What reviewers say

### Secret Message Exchange

[App page](https://appshunter.io/ios/app/secret-message-exchange/id1468223441)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Use of additional Key Images | $4.99 | one-time |


### 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 |


## Frequently asked questions

### Is Secret Message Exchange free?

Secret Message Exchange is free to download, with in-app purchases available.

### Is Underlayer free?

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

### Do Secret Message Exchange or Underlayer have ads?

Underlayer shows ads; Secret Message Exchange 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.*