# Mental Math for Work vs 産業廃棄物処理検定対策 500問

The clearest difference is price: Mental Math for Work at Free against 産業廃棄物処理検定対策 500問's $3.99. Mental Math for Work also leads on update cadence (weekly vs every 3 weeks). 産業廃棄物処理検定対策 500問's advantage is in-app purchases (none vs 2) and iOS requirement (15.1 vs 18.0). On ads and device support there is nothing between them.

Mental Math for Work is free to download; 産業廃棄物処理検定対策 500問 costs $3.99 up front. Mental Math for Work sells 2 in-app purchases, starting at $1.99 per month. 産業廃棄物処理検定対策 500問 asks for nothing beyond the download.

Mental Math for Work ships an update weekly, 産業廃棄物処理検定対策 500問 every 3 weeks. The most recent releases landed on September 10, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Mental Math for Work | 産業廃棄物処理検定対策 500問 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 15 MB | 34 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shota Morioka](https://appshunter.io/developer/483674380) | [satoshi yoshida](https://appshunter.io/developer/1873856165) |

## What reviewers say

### Mental Math for Work

[App page](https://appshunter.io/ios/app/mental-math-for-work/id6766879948)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Premium Lifetime | $9.99 | one-time |


### 産業廃棄物処理検定対策 500問

[App page](https://appshunter.io/ios/app/500/id6790227103)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math for Work free?

Mental Math for Work is free to download, with in-app purchases available.

### Is 産業廃棄物処理検定対策 500問 free?

産業廃棄物処理検定対策 500問 costs $3.99, with no in-app purchases.

### Do Mental Math for Work or 産業廃棄物処理検定対策 500問 have ads?

Neither Mental Math for Work nor 産業廃棄物処理検定対策 500問 shows ads.

### Which is updated more often, Mental Math for Work or 産業廃棄物処理検定対策 500問?

Mental Math for Work ships an update weekly, and 産業廃棄物処理検定対策 500問 every 3 weeks. Most recently, Mental Math for Work was updated on September 10, 2026 and 産業廃棄物処理検定対策 500問 on September 7, 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.*