# Na含有量 vs くつ王感染症クイックリファレンス

The clearest difference is in-app purchases: Na含有量 at none against くつ王感染症クイックリファレンス's 2. Na含有量 also leads on iOS requirement (12.1 vs 15.0). くつ王感染症クイックリファレンス's advantage is update cadence (every 5 days vs every 11 months). On price, ads and device support there is nothing between them.

Both are free to download. くつ王感染症クイックリファレンス sells 2 in-app purchases, starting at $1.99 per month. Na含有量 asks for nothing beyond the download.

Na含有量 ships an update every 11 months, くつ王感染症クイックリファレンス every 5 days. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Na含有量 | くつ王感染症クイックリファレンス |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 22 MB | 224 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [Satoshi Kutsuna](https://appshunter.io/developer/1895722022) |

## What reviewers say

### Na含有量

[App page](https://appshunter.io/ios/app/nafenafeun/id945704770)

This app calculates the sodium content in intravenous fluids and its weight in salt. It also computes FENa, FEUN, and serum osmolality.

**Highlights:** Calculate sodium content in IV fluids, Convert sodium to salt weight, Compute FENa, Compute FEUN, Calculate serum osmolality

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### くつ王感染症クイックリファレンス

[App page](https://appshunter.io/ios/app/id6764298575)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月額プラン　7日間無料から | $1.99 | per month |
| 年額プラン　7日間無料から | $19.99 | per year |


## Frequently asked questions

### Is Na含有量 free?

Na含有量 is free to download, with no in-app purchases.

### Is くつ王感染症クイックリファレンス free?

くつ王感染症クイックリファレンス is free to download, with in-app purchases available.

### Do Na含有量 or くつ王感染症クイックリファレンス have ads?

Neither Na含有量 nor くつ王感染症クイックリファレンス shows ads.

### Which is updated more often, Na含有量 or くつ王感染症クイックリファレンス?

Na含有量 ships an update every 11 months, and くつ王感染症クイックリファレンス every 5 days. Most recently, Na含有量 was updated on November 8, 2026 and くつ王感染症クイックリファレンス on November 9, 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.*