# SMS Shield vs Plain Units

The clearest difference is ads: SMS Shield at none against Plain Units's shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. SMS Shield sells 1 one-off in-app purchase and Plain Units sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | SMS Shield | Plain Units |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 3 weeks |
| Size | 13 MB | 48 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Mine Nur Kasimogullari](https://appshunter.io/developer/1735029444) | [Nicolaus Lawson](https://appshunter.io/developer/1029201825) |

## What reviewers say

### SMS Shield

[App page](https://appshunter.io/ios/app/sms-shield-ai-based/id6760599280)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


### Plain Units

[App page](https://appshunter.io/ios/app/plain-units-unit-converter/id6810955046)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is SMS Shield free?

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

### Is Plain Units free?

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

### Do SMS Shield or Plain Units have ads?

Plain Units shows ads; SMS Shield 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.*