# Kernel 背單字 vs Brief Tap

The clearest difference is in-app purchases: Kernel 背單字 at none against Brief Tap's 2. Brief Tap's advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Brief Tap sells 2 in-app purchases, starting at $5.99 per month. Kernel 背單字 asks for nothing beyond the download.

Kernel 背單字 ships an update weekly, Brief Tap every 2 weeks. The most recent releases landed on November 9, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Kernel 背單字 | Brief Tap |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 2 weeks |
| Size | 63 MB | 47 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Egan Bisma](https://appshunter.io/developer/1882424495) | [TING YU LIN](https://appshunter.io/developer/6800678392) |

## What reviewers say

### Kernel 背單字

[App page](https://appshunter.io/ios/app/kernel/id6760036064)

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

**In-app purchases:** none


### Brief Tap

[App page](https://appshunter.io/ios/app/brief-tap/id6800678390)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Brief Tap Premium 月付 | $5.99 | per month |
| Brief Tap Premium 年付 | $49.99 | per year |


## Frequently asked questions

### Is Kernel 背單字 free?

Kernel 背單字 is free to download, with no in-app purchases.

### Is Brief Tap free?

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

### Do Kernel 背單字 or Brief Tap have ads?

Both Kernel 背單字 and Brief Tap show ads.

### Which is updated more often, Kernel 背單字 or Brief Tap?

Kernel 背單字 ships an update weekly, and Brief Tap every 2 weeks. Most recently, Kernel 背單字 was updated on November 9, 2026 and Brief Tap on November 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*