Comparison

O2gO2 vs EMS Platoon Shift Calendar

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

Head to head
About

O2gO2

This utility app converts oxygen cylinder pressure into remaining time, helping users manage their compressed gas resources. It provides visual indicators and calculates duration based on tank size, current pressure, and flow rate.

Highlights
  • Converts PSI to time remaining
  • Calculates duration based on tank size, pressure, and flow rate
  • Visual multicolored strip indicates oxygen level
  • Yellow and red indicators for low oxygen
  • Automatic reset for pressure input
  • Assumes consistent tank size
Features
Read full description

The O2gO2 phone app is a very simple, easy to use, oxygen energy management tool. This application converts oxygen cylinder pressure into time remaining otherwise referred to as duration. This is the information that any user of a compressed gas needs to, or wants to know and that is...”how much time is left before the user is out of gas”. Time is the universal metric that everyone understands. There are three required inputs that are necessary to use this app and they are the size of the oxygen tank in cubic feet, the existing bottle pressure and the flow rate. Once these variables are inserted a time remaining will appear in the green display window mounted above the tank. A multicolored strip will also be displayed on the tank. This indicates visually the amount of oxygen that is left in the tank based on the PSI remaining. When the PSI remaining equals approximately 45 minutes of time remaining, the strip will begin to show yellow at the bottom of the display cylinder and when there is approximately 15 minutes of time remaining the display will turn to red, cautioning the user to replace the cylinder with a full one. Since there is no physical connection between the app and the oxygen cylinder, this calculation serves only as a mathematical “snapshot” as to the amount of oxygen left in the system based on the entered flow rate. After approximately 10 minutes of counting down the time remaining, the time windows will disappear and in its place will re-appear a keyboard and a blank oxygen pressure window forcing the user to insert a new pressure. The tank size will assume that you have not changed oxygen tank sizes as long as the user has not disconnected from the app. If the user has disconnected from the app, the oxygen tank size will have to be entered again as well. The O2gO2 provides a universal metric understood most people. This technology will begin to shape the way the world will manage its energy resources thru time management. The O2gO2 is just one of many smart tools created by Aeronautical Data Systems Inc. , so look for others in the near future. The O2gO2 comes with a 30 day free trial period where the user can cancel at any time by deselecting the buy option (or whatever you are using to turn the subscription on/off) anytime before the end of the 29th day. After this you will be charged $2.99 USD for a one year (365 day) subscription. The subscription will end at midnight on the 365th day after the day of purchase. • Auto-renewable subscription- The subscription will renew itself automatically at the end of the 365 day period unless the auto-renew option is turned off as described below. • 30 day - Free trial period, no obligation and can cancel anytime during that period. After 30 days the user will get charged $2.99 for an annual subscription. • Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew itself at the end of 365 days unless auto-renew is turned off at least 24 hours before the end of the current period. • Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase. • Privacy policy:https://adsopp.com/eops/terms

About

EMS Platoon Shift Calendar

This app helps emergency medical services personnel manage their platoon schedules. It allows users to select their platoon, view days off, and track overtime pay. It also includes a list of local hospitals and a 10-minute rule check.

Highlights
  • Platoon scheduling
  • Days off display
  • Mutual and off day tracking
  • Overtime pay calculation
  • Hospital directory
  • 10-minute rule check
Features
Read full description

- Updates and fixes will be more frequent in the coming months - Easily select your platoon (red days are days off) and add mutuals and off. - A, B, C, D , E, F, G, H Platoons available - Display multiple platoons - Overtime Pay Schedule - List of 911 receiving Hospitals within the area - 10 minute Hospital Rule Check

Screenshots

O2gO21 screens
EMS Platoon Shift Calendar4 screens

Verdict

The call

The clearest difference is rating: EMS Platoon Shift Calendar at 4.2 against O2gO2's 3.0. EMS Platoon Shift Calendar also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 28 months). O2gO2's advantage is ads (none vs shown) and iOS requirement (12.0 vs 16.0). On price 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

Both are free to download. O2gO2 sells 1 in-app purchase, starting at $2.99 per year. EMS Platoon Shift Calendar asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

EMS Platoon Shift Calendar holds the better App Store score, 4.2 against 3.0. That said, the two scores are not equally well evidenced: EMS Platoon Shift Calendar has 25 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

O2gO2 ships an update every 28 months, EMS Platoon Shift Calendar every 2 months. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
O2gO2 versus EMS Platoon Shift Calendar: the parameters behind the verdict, then further details
ParameterO2gO2EMS Platoon Shift Calendar
PriceFreeFree
Rating3.0 (2 ratings)4.2 (25 ratings) — better
Positive reviews—45.5% of reviews
Number of ratings225 — better
Update frequencyEvery 28 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size2 MB28 MB
Age rating4+4+
DeveloperAeronautical Data Systems Inc.Lato Productions, LLC

Customer experience

O2gO2

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

EMS Platoon Shift Calendar

All ratings25 ratings
Positive76.0%
Neutral8.0%
Negative16.0%
Written reviews11 reviews
Positive45.5%
Neutral9.1%
Negative45.5%

In-app purchases

1 purchases

O2gO2

Subscriptions1
  • O2 Go2 Yearly Subscription1 Month trial$2.991 Year
None

EMS Platoon Shift Calendar

No in-app purchases

Questions

Is O2gO2 free?
O2gO2 is free to download, with in-app purchases available.
Is EMS Platoon Shift Calendar free?
EMS Platoon Shift Calendar is free to download, with no in-app purchases.
Which has better reviews, O2gO2 or EMS Platoon Shift Calendar?
EMS Platoon Shift Calendar is rated higher. O2gO2 averages 3.0 out of 5 from 2 ratings, while EMS Platoon Shift Calendar averages 4.2 from 25 ratings.
Do O2gO2 or EMS Platoon Shift Calendar have ads?
EMS Platoon Shift Calendar shows ads; O2gO2 does not.
Which is updated more often, O2gO2 or EMS Platoon Shift Calendar?
O2gO2 ships an update every 28 months, and EMS Platoon Shift Calendar every 2 months. Most recently, O2gO2 was updated on October 19, 2026 and EMS Platoon Shift Calendar on October 24, 2026.

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