# PlainLock vs Jo一個T9

The clearest difference is price: Jo一個T9 at Free against PlainLock's $2.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Jo一個T9 is free to download; PlainLock costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PlainLock ships an update every 5 days, Jo一個T9 every 3 days. The most recent releases landed on October 2, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | PlainLock | Jo一個T9 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Size | 3 MB | 17 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Chang Jhih Yeh](https://appshunter.io/developer/6787857579) | [YEN YU LIN](https://appshunter.io/developer/6807881962) |

## What reviewers say

### PlainLock

[App page](https://appshunter.io/ios/app/plainlock-screen-time-blocker/id6789597367)

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

**In-app purchases:** none


### Jo一個T9

[App page](https://appshunter.io/ios/app/jot9/id6809322077)

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

**In-app purchases:** none


## Frequently asked questions

### Is PlainLock free?

PlainLock costs $2.99, with no in-app purchases.

### Is Jo一個T9 free?

Jo一個T9 is free to download, with no in-app purchases.

### Do PlainLock or Jo一個T9 have ads?

Neither PlainLock nor Jo一個T9 shows ads.

### Which is updated more often, PlainLock or Jo一個T9?

PlainLock ships an update every 5 days, and Jo一個T9 every 3 days. Most recently, PlainLock was updated on October 2, 2026 and Jo一個T9 on October 11, 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.*