# 腕力球 vs K

The clearest difference is in-app purchases: 腕力球 at none against K's 1. 腕力球 also leads on device support (3 vs 1) and iOS requirement (8.0 vs 16.0). K's advantage is update cadence (weekly vs every 9 months). On price and ads there is nothing between them.

Both are free to download. K sells 1 in-app purchase, starting at $1.99 per year. 腕力球 asks for nothing beyond the download.

腕力球 ships an update every 9 months, K weekly. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | 腕力球 | K |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Weekly** |
| Size | 31 MB | 19 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [景昆 侯](https://appshunter.io/developer/1501672712) | [Kitta Co.](https://appshunter.io/developer/1896674871) |

## What reviewers say

### 腕力球

[App page](https://appshunter.io/ios/app/id1518833486)

**Features:** macOS Compatibility

**In-app purchases:** none


### K

[App page](https://appshunter.io/ios/app/k-card-reader/id6770570934)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Mode | $1.99 | per year |


## Frequently asked questions

### Is 腕力球 free?

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

### Is K free?

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

### Do 腕力球 or K have ads?

Neither 腕力球 nor K shows ads.

### Which is updated more often, 腕力球 or K?

腕力球 ships an update every 9 months, and K weekly. Most recently, 腕力球 was updated on October 7, 2026 and K on October 15, 2026.

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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.*