# QZBrain vs LangKai

The clearest difference is update cadence: LangKai at every 4 days against QZBrain's fortnightly. LangKai also leads on iOS requirement (15.0 vs 26.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. QZBrain sells 2 in-app purchases, starting at $6.99 per month and LangKai sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

QZBrain ships an update fortnightly, LangKai every 4 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | QZBrain | LangKai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/qzbrain-brain-training-games/id6778753215/reviews)** | — |
| Number of ratings | **6** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Freemium | — |
| Size | 21 MB | 15 MB |
| Requires iOS | 26.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Flashcards World SL](https://appshunter.io/developer/1680898013) | [David Comas Mendez](https://appshunter.io/developer/6787847555) |

## What reviewers say

### QZBrain

[App page](https://appshunter.io/ios/app/qzbrain-brain-training-games/id6778753215)

Engage in a daily cognitive workout with five curated games designed to enhance memory and focus. Practice at your chosen difficulty level for about five minutes, with adaptive challenges that adjust to your performance. Track your progress with a simple score and detailed insights.

**Highlights:** Daily five-game sessions, Adaptive difficulty levels, Nine distinct brain games, Untimed memory challenges, Progress tracking with NeuroIndex, Offline play, Arcade mode for survival play

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| QZBrain Plus monthly | $6.99 | per month |
| QZBrain Plus Annual Subscription | $34.99 | per year |


### LangKai

[App page](https://appshunter.io/ios/app/langkai/id6792323515)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium mensual | $2.99 | per month |
| Premium anual | $22.99 | per year |


## Frequently asked questions

### Is QZBrain free?

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

### Is LangKai free?

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

### Do QZBrain or LangKai have ads?

Neither QZBrain nor LangKai shows ads.

### Which is updated more often, QZBrain or LangKai?

QZBrain ships an update fortnightly, and LangKai every 4 days. Most recently, QZBrain was updated on October 31, 2026 and LangKai on November 5, 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.*