# Denken 3rd Class vs Refrigeration License 1/2/3

The clearest difference is in-app purchases: Denken 3rd Class at none against Refrigeration License 1/2/3's 1. Denken 3rd Class also leads on device support (3 vs 1). Refrigeration License 1/2/3's advantage is ads (none vs shown). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. Refrigeration License 1/2/3 sells 1 one-off in-app purchase. Denken 3rd Class asks for nothing beyond the download.

Denken 3rd Class ships an update every 5 days, Refrigeration License 1/2/3 every 4 days. Both last shipped on November 10, 2026.

## The numbers

| Metric | Denken 3rd Class | Refrigeration License 1/2/3 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 days | **Every 4 days** |
| Size | 71 MB | 11 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [hyuncheol seo](https://appshunter.io/developer/6797554122) | [Particles and Waves](https://appshunter.io/developer/1812653811) |

## What reviewers say

### Denken 3rd Class

[App page](https://appshunter.io/ios/app/denken-3rd-class-passrun/id6809243739)

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

**In-app purchases:** none


### Refrigeration License 1/2/3

[App page](https://appshunter.io/ios/app/refrigeration-license-123/id6813080286)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro: Classes 1/2/3 | $2.99 | one-time |


## Frequently asked questions

### Is Denken 3rd Class free?

Denken 3rd Class is free to download, with no in-app purchases.

### Is Refrigeration License 1/2/3 free?

Refrigeration License 1/2/3 is free to download, with in-app purchases available.

### Do Denken 3rd Class or Refrigeration License 1/2/3 have ads?

Denken 3rd Class shows ads; Refrigeration License 1/2/3 does not.

### Which is updated more often, Denken 3rd Class or Refrigeration License 1/2/3?

Denken 3rd Class ships an update every 5 days, and Refrigeration License 1/2/3 every 4 days. Most recently, Denken 3rd Class was updated on November 10, 2026 and Refrigeration License 1/2/3 on November 10, 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.*