# 音域测试 vs HeiLock

The clearest difference is in-app purchases: HeiLock at none against 音域测试's 1. 音域测试's advantage is iOS requirement (13.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. 音域测试 sells 1 in-app purchase, starting at $1.99 per 7 days. HeiLock asks for nothing beyond the download.

## The numbers

| Metric | 音域测试 | HeiLock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | — | Weekly |
| Size | 30 MB | 19 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [燕燕 林](https://appshunter.io/developer/1675436596) | [北京尾巴频率科技有限公司](https://appshunter.io/developer/6773318006) |

## What reviewers say

### 音域测试

[App page](https://appshunter.io/ios/app/id6770483474)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 音域测试尊贵会员 | $1.99 | per 7 days |


### HeiLock

[App page](https://appshunter.io/ios/app/heilock/id6776676490)

**In-app purchases:** none


## Frequently asked questions

### Is 音域测试 free?

音域测试 is free to download, with in-app purchases available.

### Is HeiLock free?

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

### Do 音域测试 or HeiLock have ads?

Neither 音域测试 nor HeiLock shows ads.

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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.*