O2 Duration vs Vehicle Service Manager
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
O2 Duration
Calculate the approximate remaining oxygen in portable cylinders. Select your tank size, input current pressure and desired flow rate to see duration in minutes. Features a timer with alerts for low pressure.
- Oxygen cylinder duration calculation
- Supports multiple cylinder sizes (A, B, D, E, G, H, K, M)
- Input current tank pressure
- Input desired flow rate
- Displays duration in minutes
- Running timer with remaining time
- Low pressure alerts (500lbs and 0lbs)
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O2 Duration is an oxygen consumption calculator for various oxygen cylinder sizes. This is the easiest way to quickly determine the approximate number of minutes until an oxygen tank will be depleted of oxygen. This tool is a must have for Nurse's and EMT’s who work with portable oxygen cylinders. The application allows you to select cylinder tank sizes A, B, D E, G, H, K and M. With the current tank pressure and desired flow rate, the app will display the oxygen duration in minutes. Additionally, a timer can be started which will display a running tank pressure and time in minutes remaining until the tank is empty. When tank pressure reaches 500lbs or when the tank pressure is zero the application will alert you. This is not a substitute for looking at the oxygen cylinder gauge to determine actual pressure and should not be relied on as a means to determine oxygen remaining.
Vehicle Service Manager
Easily track all your vehicle maintenance, service history, and costs. Get reminders for upcoming services and detailed insights into your car's upkeep. Supports multiple vehicles and offers advanced analytics.
- Multi-vehicle garage support
- Service reminders
- Detailed service logging
- Cost tracking and analysis
- Mileage/odometer tracking
- Export to PDF/CSV
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Take control of your vehicle maintenance with Vehicle Service Manager (VSM), the comprehensive car service tracking app that turns complex maintenance records into simple, actionable insights. Whether you're a car enthusiast or simply want to keep your vehicle in top condition, VSM helps you track every service, cost, and milestone with ease. Now in 34 languages! Use VSM on all of your Apple devices with seamless iCloud compatibility! FEATURES Vehicle Management • Service Reminders • Multi-vehicle garage support • Detailed vehicle profiles • Intelligent VIN Lookup * Customizable vehicle icons • Mileage/odometer tracking Service Records • Comprehensive service logging • Customizable service types • Add technician details • Location tracking • Service notes and documentation Cost Tracking & Analytics • Detailed cost breakdowns • Service cost trends • Monthly spending analysis • Currency customization Smart Statistics • Service frequency analysis • Cost distribution charts • Maintenance patterns • Historical service data Maintenance Tools • Custom tracking fields • Service reminders • Export to PDF/CSV • Service history timeline Premium Features • Unlimited vehicles • Advanced analytics • Enhanced reporting • Unlimited Services Never miss a service interval or forget a repair detail again. Download Vehicle Service Manager today and give your vehicles the care they deserve. Languages Supported: English (base) Arabic Bulgarian Catalan Chinese, Simplified Chinese, Traditional Croatian Czech Danish Dutch Finnish French German Greek Hebrew Hindi Hungarian Indonesian Italian Japanese Kazakh Korean Malay Polish Portuguese (Brazil) Romanian Russian Slovak Spanish Swedish Thai Turkish Ukrainian Vietnamese
Screenshots
Verdict
The clearest difference is review sentiment: Vehicle Service Manager at 75% against O2 Duration's 0%. Vehicle Service Manager also leads on price (Free vs $2.99) and rating (4.7 vs 1.0). O2 Duration's advantage is in-app purchases (none vs 4) and iOS requirement (7.0 vs 17.0). On ads 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
Vehicle Service Manager is free to download; O2 Duration costs $2.99 up front. Vehicle Service Manager sells 4 one-off in-app purchases. O2 Duration asks for nothing beyond the download.
Vehicle Service Manager holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Vehicle Service Manager has 32 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of O2 Duration's written reviews are positive against 75% of Vehicle Service Manager's.
O2 Duration ships an update every 15 months, Vehicle Service Manager every 2 weeks. The most recent releases landed on October 15, 2026 and October 24, 2026 respectively.
| Parameter | O2 Duration | Vehicle Service Manager |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.7 (32 ratings) — better |
| Positive reviews | 0.0% of reviews | 75.0% of reviews — better |
| Number of ratings | 1 | 32 — better |
| Update frequency | Every 15 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 7.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Advanced Aviation LLC | Aren Baghramian |
Customer experience
O2 Duration
Vehicle Service Manager
In-app purchases
O2 Duration
No in-app purchases
Vehicle Service Manager
- A small tip!$0.99
- Generous Tip$4.99
- Lifetime$4.99
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- Massive Tip$14.99
Questions
Is O2 Duration free?
Is Vehicle Service Manager free?
Which has better reviews, O2 Duration or Vehicle Service Manager?
Do O2 Duration or Vehicle Service Manager have ads?
Which is updated more often, O2 Duration or Vehicle Service Manager?
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