Comparison

LZControl vs Oxygen Calculation Tool

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

LZControl

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
Read full description

The LZControl landing zone database app gives you offline access to the entire LZ database including images.

About

Oxygen Calculation Tool

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
Currently charting
Read full description

Oxygen Calculation Tool is an app designed with transport medical professionals in mind. Once you enter your oxygen supply and a flow rate, your minutes of usable oxygen will be generated. Oxygen Calculation Tool makes it easy to add and delete up to 10 cylinders for both the portable and onboard supply. The user also has the flexibility to enter the flow rate as a free flow setting or from ventilation settings, calculated from the minute ventilation and the FiO2 settings. Optionally, user can also enter ventilator-specific bias flow, if needed. Oxygen Calculation Tool also has a countdown feature. This can be used to time your O2 use with your chosen settings. Using the countdown will update the settings automatically. The drip rate calculator can be used to assist you with med math. Enter the supply and dose information and the calculator will determine the rate in ml/hr. Oxygen Calculation Tool contains a reference page, where the math calculation used in this app is outlined, along with a list of oxygen cylinders and associated conversion factors. If you don't see a cylinder size that you need, use the feedback feature found in the settings to let me know and I will try to add it. This app is also dark mode compatible. Calculations are rounded down to the nearest whole minute. ***Please note, this app does NOT subtract 200 psi from initial input to account for residual O2. Some formulas may call for this. If this is desired by users, you can subtract 200 psi from your pressure prior to input.

Screenshots

LZControl3 screens
Oxygen Calculation Tool4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 7 level
LZControl versus Oxygen Calculation Tool: the parameters behind the verdict, then further details
ParameterLZControlOxygen Calculation Tool
PriceFree — better$0.99
Rating—4.8 (152 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—152 — better
Update frequencyEvery 2 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank—#188 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.1 — better15.4
Further details — not scored
Size47 MB15 MB
Age rating4+12+
DeveloperProtean LLCJoshua Savko

Customer experience

LZControl

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Oxygen Calculation Tool

All ratings152 ratings
Positive96.7%
Neutral1.3%
Negative2.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

LZControl

No in-app purchases

None

Oxygen Calculation Tool

No in-app purchases

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.

Other comparisons