Duty vs AviCalc
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Duty
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Duty-Rest is a professional aviation tool designed to simplify and optimize inflight crew rest management for long-range operations. Quickly calculate and distribute crew rest periods between pilots and cabin crew while maintaining a clear overview of all active and upcoming rest intervals. Designed for real-world airline operations, Duty-Rest helps crews coordinate rest schedules efficiently, reduce workload, and improve situational awareness during flight. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
AviCalc
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Calculate your duty times, fuel uplifts easy and fast. To use the app, read the full text of instructions. Purpose of AviationCalc: Flight Duty Period Page: AviationCalc helps you calculate Maximum Duty Periods and Total Duty Periods, correcting for time zones from the start of duty location and end of duty time zone. Also, it will search maximum flight duty period for acclimatised crew for Hong Kong CAD. Fuel Uplift Page: AviationCalc helps you calculate fuel uplift in Kg, USG and Litres to help you calculate your data fast and easy. ***Disclamer*** The information this app presents should not be used as primary tool for your calculations. Allowing the app access your location will only allow the app to help get better precision on which Time Zone to use. Click on info button (bottom right) to pull up how-to-use alerts or whenever you want to change the regulatory institution or choose a different time after flight duty for total duty period calculation. If there is something wrong going on, tap the screen again. Please leave your review.
Screenshots
Verdict
The clearest difference is in-app purchases: AviCalc at none against Duty's 1. AviCalc also leads on iOS requirement (15.0 vs 17.6). Duty's advantage is update cadence (every 3 days vs every 3 weeks). On price, ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Duty sells 1 in-app purchase, starting at $1.99 per year. AviCalc asks for nothing beyond the download.
Duty ships an update every 3 days, AviCalc every 3 weeks. The most recent releases landed on September 9, 2026 and September 19, 2026 respectively.
| Parameter | Duty | AviCalc |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days โ better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad | iPhone, iPad, iPod โ better |
| Requires iOS | 17.6 | 15.0 โ better |
| Further details โ not scored | ||
| Size | 44 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Handl | Aldo Mendes Martins |
In-app purchases
Duty
- Unlimited access7 Days trial$1.991 Year
AviCalc
No in-app purchases
Questions
Is Duty free?
Is AviCalc free?
Do Duty or AviCalc have ads?
Which is updated more often, Duty or AviCalc?
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