# 源泉徴収係長R vs スマin（すまいん）

The clearest difference is in-app purchases: スマin（すまいん） at none against 源泉徴収係長R's 1. 源泉徴収係長R's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. 源泉徴収係長R sells 1 in-app purchase, starting at $2.49 per 3 months. スマin（すまいん） asks for nothing beyond the download.

源泉徴収係長R ships an update every 9 months, スマin（すまいん） every 14 months. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | 源泉徴収係長R | スマin（すまいん） |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 9 months** | Every 14 months |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 21 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ho't unite](https://appshunter.io/developer/486153744) | [Aperi Inc.](https://appshunter.io/developer/1657602352) |

## What reviewers say

### 源泉徴収係長R

[App page](https://appshunter.io/ios/app/r/id1522187059)

Calculate various withholding tax amounts easily, including salary, bonuses, and various fees. Offers reverse calculation from net pay and handles consumption tax for fees. Supports retirement income tax calculations.

**Highlights:** Salary and bonus tax calculation, Various fee tax calculation, Reverse calculation from net pay, Consumption tax calculation for fees, Retirement income tax calculation, Dividend and interest tax calculation

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 有料全機能オプション | $2.49 | per 3 months |


### スマin（すまいん）

[App page](https://appshunter.io/ios/app/in/id6480444133)

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

**In-app purchases:** none


## Frequently asked questions

### Is 源泉徴収係長R free?

源泉徴収係長R is free to download, with in-app purchases available.

### Is スマin（すまいん） free?

スマin（すまいん） is free to download, with no in-app purchases.

### Do 源泉徴収係長R or スマin（すまいん） have ads?

スマin（すまいん） shows ads; 源泉徴収係長R does not.

### Which is updated more often, 源泉徴収係長R or スマin（すまいん）?

源泉徴収係長R ships an update every 9 months, and スマin（すまいん） every 14 months. Most recently, 源泉徴収係長R was updated on October 8, 2026 and スマin（すまいん） on October 1, 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.*