# インボイス計算 vs Verify Calculator

The clearest difference is in-app purchases: インボイス計算 at none against Verify Calculator's 1. インボイス計算 also leads on update cadence (every 9 days vs every 5 weeks) and iOS requirement (13.0 vs 15.4). On price, ads and device support there is nothing between them.

Both are free to download. Verify Calculator sells 1 one-off in-app purchase. インボイス計算 asks for nothing beyond the download.

インボイス計算 ships an update every 9 days, Verify Calculator every 5 weeks. The most recent releases landed on September 21, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | インボイス計算 | Verify Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 9 days** | Every 5 weeks |
| Size | 20 MB | 15 MB |
| Requires iOS | **13.0** | 15.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [ExOR Inc.](https://appshunter.io/developer/1717324092) | [hiroshi mizuno](https://appshunter.io/developer/1742325047) |

## What reviewers say

### インボイス計算

[App page](https://appshunter.io/ios/app/id6475646168)

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

**In-app purchases:** none


### Verify Calculator

[App page](https://appshunter.io/ios/app/verify-calculator/id6499068707)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $5.99 | one-time |


## Frequently asked questions

### Is インボイス計算 free?

インボイス計算 is free to download, with no in-app purchases.

### Is Verify Calculator free?

Verify Calculator is free to download, with in-app purchases available.

### Do インボイス計算 or Verify Calculator have ads?

Both インボイス計算 and Verify Calculator show ads.

### Which is updated more often, インボイス計算 or Verify Calculator?

インボイス計算 ships an update every 9 days, and Verify Calculator every 5 weeks. Most recently, インボイス計算 was updated on September 21, 2026 and Verify Calculator on September 20, 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.*