# NPD对抗21天 vs AntiRepeat

The clearest difference is device support: NPD对抗21天 at 2 against AntiRepeat's —. AntiRepeat's advantage is iOS requirement (15.0 vs 17.6). On price and in-app purchases there is nothing between them.

Both are free to download. NPD对抗21天 sells 1 one-off in-app purchase and AntiRepeat sells 1 in-app purchase, starting at $12.99 per year. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | NPD对抗21天 | AntiRepeat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | — |
| Update frequency | Every 10 months | — |
| Size | 5 MB | 5 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | **iPhone, iPad** | — |
| Age rating | 4+ | 4+ |
| Developer | [阳 孙](https://appshunter.io/developer/1518808403) | [阳 赵](https://appshunter.io/developer/1863829449) |

## What reviewers say

### NPD对抗21天

[App page](https://appshunter.io/ios/app/npd21/id6757114144)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NPD对抗21天 Pro | $0.99 | one-time |


### AntiRepeat

[App page](https://appshunter.io/ios/app/antirepeat/id6760582342)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AntiRepeat Annual | $12.99 | per year |


## Frequently asked questions

### Is NPD对抗21天 free?

NPD对抗21天 is free to download, with in-app purchases available.

### Is AntiRepeat free?

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

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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.*