# Just vs Zenzu

The clearest difference is in-app purchases: Zenzu at none against Just's 1. Zenzu also leads on ads (none vs shown). Just's advantage is iOS requirement (13.0 vs 15.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Just sells 1 in-app purchase, starting at $3.99 per month. Zenzu asks for nothing beyond the download.

Just ships an update weekly, Zenzu every 4 days. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Just | Zenzu |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Every 4 days** |
| Size | 65 MB | 80 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hong Gyu Kim](https://appshunter.io/developer/1765490914) | [Nick Bibikov](https://appshunter.io/developer/992821026) |

## What reviewers say

### Just

[App page](https://appshunter.io/ios/app/just-do/id6727002720)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| JUST DO ‘The more.’ | $3.99 | per month |


### Zenzu

[App page](https://appshunter.io/ios/app/zenzu-ai-language-mastery/id6761502445)

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

**In-app purchases:** none


## Frequently asked questions

### Is Just free?

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

### Is Zenzu free?

Zenzu is free to download, with no in-app purchases.

### Do Just or Zenzu have ads?

Just shows ads; Zenzu does not.

### Which is updated more often, Just or Zenzu?

Just ships an update weekly, and Zenzu every 4 days. Most recently, Just was updated on October 27, 2026 and Zenzu on October 31, 2026.

---

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