# LZControl vs Oxygen Calculation Tool

The clearest difference is price: LZControl at Free against Oxygen Calculation Tool's $0.99. LZControl also leads on update cadence (every 2 weeks vs every 3 months). Oxygen Calculation Tool's advantage is chart position (#188 vs unranked). On review sentiment, ads, in-app purchases and device support there is nothing between them.

LZControl is free to download; Oxygen Calculation Tool costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

LZControl ships an update every 2 weeks, Oxygen Calculation Tool every 3 months. The most recent releases landed on September 28, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | LZControl | Oxygen Calculation Tool |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[4.8 (152 ratings)](https://appshunter.io/ios/app/oxygen-calculation-tool/id1502863745/reviews)** |
| Number of ratings | — | **152** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#188** |
| Size | 47 MB | 15 MB |
| Requires iOS | **15.1** | 15.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Protean LLC](https://appshunter.io/developer/1185682042) | [Joshua Savko](https://appshunter.io/developer/1502863744) |

## What reviewers say

### LZControl

[App page](https://appshunter.io/ios/app/lzcontrol/id1185682043)

Access a comprehensive crowd-sourced landing zone database offline, complete with images. This reference tool provides essential information without requiring an internet connection.

**Highlights:** Offline database access, Crowd-sourced data, Includes images, Landing zone information

**Features:** macOS Compatibility

**In-app purchases:** none


### Oxygen Calculation Tool

[App page](https://appshunter.io/ios/app/oxygen-calculation-tool/id1502863745)

**Currently charting:** #188 Top Paid · Reference (US App Store)

This app helps medical transport professionals quickly calculate usable oxygen supply based on cylinder pressure and flow rate. It also includes a drip rate calculator for medication math and a reference section with conversion factors. Features a countdown timer and dark mode compatibility.

**Highlights:** Oxygen supply calculation, Drip rate calculator, Countdown timer, Reference page with conversion factors, Dark mode compatibility, Supports up to 10 cylinders

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LZControl free?

LZControl is free to download, with no in-app purchases.

### Is Oxygen Calculation Tool free?

Oxygen Calculation Tool costs $0.99, with no in-app purchases.

### Do LZControl or Oxygen Calculation Tool have ads?

Neither LZControl nor Oxygen Calculation Tool shows ads.

### Which is updated more often, LZControl or Oxygen Calculation Tool?

LZControl ships an update every 2 weeks, and Oxygen Calculation Tool every 3 months. Most recently, LZControl was updated on September 28, 2026 and Oxygen Calculation Tool on October 4, 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.*