Duty vs Voltage Drop Calculators
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Duty
Read full descriptionHide full description
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/
Voltage Drop Calculators
This tool helps electrical professionals and students perform quick and accurate voltage drop calculations. It features a user-friendly interface, a material database, and the ability to save circuit details for efficient system design and compliance.
- Fast voltage drop calculations
- Built-in material database
- Custom material support
- Save circuit details
- Unit conversion
- Recommended wire size guidance
Read full descriptionHide full description
The Voltage Drop Calculator app is a practical and reliable tool designed for electrical engineers, technicians, electricians, and students who need quick and accurate voltage drop calculations. It helps ensure electrical systems are designed efficiently, safely, and in compliance with standards. With a simple and intuitive interface, the app allows you to calculate voltage drop by entering key parameters such as cable length, load current, conductor type, and wire size. Results are generated instantly, saving time and reducing calculation errors during planning and installation. The app includes a built-in conductor material database, featuring commonly used materials like copper and aluminum with accurate resistivity values. For specialized applications, users can also define custom materials to match project requirements. To support real-world electrical work, the app lets you save and manage circuit details, making it easy to revisit calculations and maintain organized records for future reference. Flexible unit conversion options allow seamless switching between metric and imperial units, ensuring compatibility across different standards and regions. Key Highlights: - Fast and accurate voltage drop calculations - Built-in material database with custom material support - Clear and detailed calculation results - Voltage drop percentage and load-end voltage output - Recommended wire size guidance - Easy unit conversion (length, diameter, and more) - Simple, user-friendly design for all experience levels Whether you’re designing a new circuit, verifying an installation, or learning electrical fundamentals, the Voltage Drop Calculator app provides a dependable solution for everyday electrical calculations.
Screenshots
Verdict
The clearest difference is price: Duty at Free against Voltage Drop Calculators's $3.99. Duty also leads on update cadence (every 3 days vs every 7 months). Voltage Drop Calculators's advantage is in-app purchases (none vs 1) and iOS requirement (15.6 vs 17.6). 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
Duty is free to download; Voltage Drop Calculators costs $3.99 up front. Duty sells 1 in-app purchase, starting at $1.99 per year. Voltage Drop Calculators asks for nothing beyond the download.
Duty ships an update every 3 days, Voltage Drop Calculators every 7 months. Both last shipped on November 3, 2026.
| Parameter | Duty | Voltage Drop Calculators |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | — | 4.0 (4 ratings) — better |
| Number of ratings | — | 4 — better |
| Update frequency | Every 3 days — better | Every 7 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 44 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Handl | Kantaben Gorasiya |
In-app purchases
Duty
- Unlimited access7 Days trial$1.991 Year
Voltage Drop Calculators
No in-app purchases
Questions
Is Duty free?
Is Voltage Drop Calculators free?
Do Duty or Voltage Drop Calculators have ads?
Which is updated more often, Duty or Voltage Drop Calculators?
Other comparisons















