# Know Brainer vs Kluchi

The clearest difference is in-app purchases: Know Brainer at none against Kluchi's 1. Know Brainer also leads on review sentiment (80% vs 50%) and iOS requirement (11.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Kluchi sells 1 one-off in-app purchase. Know Brainer asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on June 24, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Know Brainer | Kluchi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kluchi/id1182879708/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **80.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 92 MB | 5 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ritori](https://appshunter.io/developer/975033206) | [Maxim Polous](https://appshunter.io/developer/560072891) |

## What reviewers say

### Know Brainer

[App page](https://appshunter.io/ios/app/know-brainer/id954165627)

Explore fascinating science facts and distinguish truth from fiction. Engage in challenges, discover surprising facts, and compete with others to become the smartest player. This addictive and free game offers a fresh perspective on the world.

**Highlights:** Mind-blowing science facts, Distinguish fact from fiction, Surprising discoveries, Challenge fellow players, Free to play, Addictive gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


### Kluchi

[App page](https://appshunter.io/ios/app/kluchi/id1182879708)

This puzzle game challenges players to strategically place all keys onto a table. Utilize unique key connectors and special "neighbors" mechanics to solve increasingly complex arrangements. Hints are available to assist when you get stuck.

**Highlights:** Key placement puzzle, Unique connector mechanics, Special 'neighbors' keys, Hint system, Brain training benefits, New puzzle type

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 9 hints | $0.99 | one-time |


## Frequently asked questions

### Is Know Brainer free?

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

### Is Kluchi free?

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

### Do Know Brainer or Kluchi have ads?

Neither Know Brainer nor Kluchi shows ads.

### Which is updated more often, Know Brainer or Kluchi?

Know Brainer ships an update every 3 weeks, and Kluchi every 3 weeks. Most recently, Know Brainer was updated on June 24, 2026 and Kluchi on September 4, 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.*