# 计算器Pro vs Xzs 安全锁

The clearest difference is price: Xzs 安全锁 at Free against 计算器Pro's $2.99. Xzs 安全锁 also leads on ads (none vs shown) and update cadence (fortnightly vs every 39 months). 计算器Pro's advantage is in-app purchases (none vs 4). On device support and iOS requirement there is nothing between them.

Xzs 安全锁 is free to download; 计算器Pro costs $2.99 up front. Xzs 安全锁 sells 4 one-off in-app purchases. 计算器Pro asks for nothing beyond the download.

计算器Pro ships an update every 39 months, Xzs 安全锁 fortnightly. The most recent releases landed on October 15, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | 计算器Pro | Xzs 安全锁 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 39 months | **Fortnightly** |
| Size | 29 MB | 73 MB |
| Requires iOS | 16.6 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [doudoubird](https://appshunter.io/developer/1383154758) | [西平 张](https://appshunter.io/developer/6791660662) |

## What reviewers say

### 计算器Pro

[App page](https://appshunter.io/ios/app/pro/id6450943764)

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

**In-app purchases:** none


### Xzs 安全锁

[App page](https://appshunter.io/ios/app/xzs-app/id6794345981)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一月VIP | $2.99 | one-time |
| 一年VIP | $14.99 | one-time |
| 两年VIP | $24.99 | one-time |
| 永久VIP | $39.99 | one-time |


## Frequently asked questions

### Is 计算器Pro free?

计算器Pro costs $2.99, with no in-app purchases.

### Is Xzs 安全锁 free?

Xzs 安全锁 is free to download, with in-app purchases available.

### Do 计算器Pro or Xzs 安全锁 have ads?

计算器Pro shows ads; Xzs 安全锁 does not.

### Which is updated more often, 计算器Pro or Xzs 安全锁?

计算器Pro ships an update every 39 months, and Xzs 安全锁 fortnightly. Most recently, 计算器Pro was updated on October 15, 2026 and Xzs 安全锁 on October 9, 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.*