# 2級ボイラーの森 vs 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種

2級ボイラーの森 and 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 2級ボイラーの森 sells 1 one-off in-app purchase and 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

2級ボイラーの森 ships an update every 3 weeks, 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 monthly. The most recent releases landed on October 30, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | 2級ボイラーの森 | 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 99 MB | 50 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [合同会社OLA](https://appshunter.io/developer/1832165711) | [GINOAPPS LLC.](https://appshunter.io/developer/1482621114) |

## What reviewers say

### 2級ボイラーの森

[App page](https://appshunter.io/ios/app/2/id6747311296)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| すべての年度がアンロックされます | $3.99 | one-time |


### 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種

[App page](https://appshunter.io/ios/app/3/id6762459428)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全問題アンロック | $2.99 | one-time |


## Frequently asked questions

### Is 2級ボイラーの森 free?

2級ボイラーの森 is free to download, with in-app purchases available.

### Is 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 free?

冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 is free to download, with in-app purchases available.

### Do 2級ボイラーの森 or 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 have ads?

Neither 2級ボイラーの森 nor 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 shows ads.

### Which is updated more often, 2級ボイラーの森 or 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種?

2級ボイラーの森 ships an update every 3 weeks, and 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 monthly. Most recently, 2級ボイラーの森 was updated on October 30, 2026 and 冷凍機械責任者 3種 秒トレ：忘却曲線で覚える冷凍三種 on November 2, 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.*