# OSS vs 公害防止管理者 大気1種 試験対策一問一答

The clearest difference is price: 公害防止管理者 大気1種 試験対策一問一答 at Free against OSS's $3.99. OSS's advantage is in-app purchases (none vs 1) and iOS requirement (15.1 vs 17.0). On ads and device support there is nothing between them.

公害防止管理者 大気1種 試験対策一問一答 is free to download; OSS costs $3.99 up front. 公害防止管理者 大気1種 試験対策一問一答 sells 1 one-off in-app purchase. OSS asks for nothing beyond the download.

## The numbers

| Metric | OSS | 公害防止管理者 大気1種 試験対策一問一答 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | — |
| Size | 44 MB | 6 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daisuke Matsubara](https://appshunter.io/developer/1720755722) | [Takaho Hayashi](https://appshunter.io/developer/6788691940) |

## What reviewers say

### OSS

[App page](https://appshunter.io/ios/app/oss-db-silver/id6745166641)

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

**In-app purchases:** none


### 公害防止管理者 大気1種 試験対策一問一答

[App page](https://appshunter.io/ios/app/1/id6800722356)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 全機能解除 | $4.99 | one-time |


## Frequently asked questions

### Is OSS free?

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

### Is 公害防止管理者 大気1種 試験対策一問一答 free?

公害防止管理者 大気1種 試験対策一問一答 is free to download, with in-app purchases available.

### Do OSS or 公害防止管理者 大気1種 試験対策一問一答 have ads?

Neither OSS nor 公害防止管理者 大気1種 試験対策一問一答 shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*