# 酸素ボンベの残量計算 / O2Calc vs 点滴滴下ナビ

The clearest difference is ads: 酸素ボンベの残量計算 / O2Calc at none against 点滴滴下ナビ's shown. 点滴滴下ナビ's advantage is update cadence (every 2 weeks vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

酸素ボンベの残量計算 / O2Calc ships an update every 6 weeks, 点滴滴下ナビ every 2 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 酸素ボンベの残量計算 / O2Calc | 点滴滴下ナビ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 8 MB | 31 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 12+ |
| Developer | [Kazuhiro Higuchi](https://appshunter.io/developer/1887293944) | [Daisuke Inoue](https://appshunter.io/developer/1826280305) |

## What reviewers say

### 酸素ボンベの残量計算 / O2Calc

[App page](https://appshunter.io/ios/app/o2calc/id6765861239)

This medical utility app assists healthcare professionals with critical oxygen management calculations. It offers features like oxygen remaining time estimation, FiO2 calculation, and pressure unit conversion, all within a clean, ad-free, and offline-capable interface.

**Highlights:** Oxygen remaining time calculation, FiO2 estimation by device, Pressure unit conversion, 3-stage abnormal value alerts, Double-check screen, Independent dark mode, Live Activities & Dynamic Island integration

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

**In-app purchases:** none


### 点滴滴下ナビ

[App page](https://appshunter.io/ios/app/id6780919575)

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

**In-app purchases:** none


## Frequently asked questions

### Is 酸素ボンベの残量計算 / O2Calc free?

酸素ボンベの残量計算 / O2Calc is free to download, with no in-app purchases.

### Is 点滴滴下ナビ free?

点滴滴下ナビ is free to download, with no in-app purchases.

### Do 酸素ボンベの残量計算 / O2Calc or 点滴滴下ナビ have ads?

点滴滴下ナビ shows ads; 酸素ボンベの残量計算 / O2Calc does not.

### Which is updated more often, 酸素ボンベの残量計算 / O2Calc or 点滴滴下ナビ?

酸素ボンベの残量計算 / O2Calc ships an update every 6 weeks, and 点滴滴下ナビ every 2 weeks. Most recently, 酸素ボンベの残量計算 / O2Calc was updated on October 24, 2026 and 点滴滴下ナビ on October 28, 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.*