# K vs Visualization Training

The clearest difference is price: Visualization Training at Free against K's $3.99. Visualization Training also leads on update cadence (weekly vs every 3 months). K's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 26.4). On ads and device support there is nothing between them.

Visualization Training is free to download; K costs $3.99 up front. Visualization Training sells 1 one-off in-app purchase. K asks for nothing beyond the download.

K ships an update every 3 months, Visualization Training weekly. The most recent releases landed on September 16, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | K | Visualization Training |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Size | 112 MB | 21 MB |
| Requires iOS | **11.0** | 26.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jongyun Park](https://appshunter.io/developer/382617671) | [Shingo Fukuyama](https://appshunter.io/developer/917557248) |

## What reviewers say

### K

[App page](https://appshunter.io/ios/app/k/id1595257097)

**Features:** macOS Compatibility

**In-app purchases:** none


### Visualization Training

[App page](https://appshunter.io/ios/app/visualization-training/id6788350226)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | one-time |


## Frequently asked questions

### Is K free?

K costs $3.99, with no in-app purchases.

### Is Visualization Training free?

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

### Do K or Visualization Training have ads?

Neither K nor Visualization Training shows ads.

### Which is updated more often, K or Visualization Training?

K ships an update every 3 months, and Visualization Training weekly. Most recently, K was updated on September 16, 2026 and Visualization Training on September 9, 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.*