# 棱镜时光 vs GuardRail

The clearest difference is in-app purchases: 棱镜时光 at none against GuardRail's 3. 棱镜时光 also leads on update cadence (every 3 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. GuardRail sells 3 one-off in-app purchases. 棱镜时光 asks for nothing beyond the download.

棱镜时光 ships an update every 3 days, GuardRail every 9 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | 棱镜时光 | GuardRail |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 9 days |
| Size | 185 MB | 2 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [杰 黄](https://appshunter.io/developer/6800548242) | [培林 王](https://appshunter.io/developer/6798741432) |

## What reviewers say

### 棱镜时光

[App page](https://appshunter.io/ios/app/id6800583898)

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

**In-app purchases:** none


### GuardRail

[App page](https://appshunter.io/ios/app/guardrail-screen-time-pause/id6802604508)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Support | $0.99 | one-time |
| Support Development | $3.99 | one-time |
| Special Support | $12.99 | one-time |


## Frequently asked questions

### Is 棱镜时光 free?

棱镜时光 is free to download, with no in-app purchases.

### Is GuardRail free?

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

### Do 棱镜时光 or GuardRail have ads?

Neither 棱镜时光 nor GuardRail shows ads.

### Which is updated more often, 棱镜时光 or GuardRail?

棱镜时光 ships an update every 3 days, and GuardRail every 9 days. Most recently, 棱镜时光 was updated on October 31, 2026 and GuardRail on October 31, 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.*