# Kernel 背單字 vs Lingo Diary

The clearest difference is in-app purchases: Kernel 背單字 at none against Lingo Diary's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Lingo Diary sells 3 in-app purchases, starting at $9.99 per month. Kernel 背單字 asks for nothing beyond the download.

Kernel 背單字 ships an update weekly, Lingo Diary every 9 days. The most recent releases landed on September 19, 2026 and July 11, 2026 respectively.

## The numbers

| Metric | Kernel 背單字 | Lingo Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 9 days |
| Size | 63 MB | 44 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Egan Bisma](https://appshunter.io/developer/1882424495) | [SPARKLECT CO.,LTD.](https://appshunter.io/developer/1609566694) |

## 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


### Lingo Diary

[App page](https://appshunter.io/ios/app/lingo-diary-learn-by-talking/id6760644930)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus | $9.99 | per month |
| Pro | $12.99 | per month |
| Max | $19.99 | per month |


## Frequently asked questions

### Is Kernel 背單字 free?

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

### Is Lingo Diary free?

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

### Do Kernel 背單字 or Lingo Diary have ads?

Both Kernel 背單字 and Lingo Diary show ads.

### Which is updated more often, Kernel 背單字 or Lingo Diary?

Kernel 背單字 ships an update weekly, and Lingo Diary every 9 days. Most recently, Kernel 背單字 was updated on September 19, 2026 and Lingo Diary on July 11, 2026.

---

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