Comparison

RF vs Voltage Drop Calculators

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

Head to head
About

RF

This app provides over 90 specialized tools for high-frequency electronics, catering to RF professionals, radio amateurs, and students. It offers calculations for PCB traces, filters, impedance, and more, with ongoing updates and new features planned.

Highlights
  • PCB Trace Width and Impedance
  • LC/L/T/Pi Match Calculation
  • Coax Cable Calculations
  • Amplifier and Attenuator Cascade
  • SWR/Reflection/Return Loss Conversion
  • Filter Design (Butterworth, Chebyshev)
  • RF Units Conversion
Read full description

Specialized on high frequency electronics for RF professionals, radio amateurs and students. RF-Toolbox is based on the popular Electronic Toolbox by Marcus Roskosch. This app contains some of the common tools of Electronic Toolbox but contains a wide range of additional tools, specialized for high frequency electronics, RF professionals, radio amateurs and students. Currently RF-Toolbox consists of more than 90 tools and like Electronic Toolbox, there are more to come over the time. Feature list: ■ PCB Trace Width (Internal and external Traces) ■ PCB Trace Resistance ■ PCB Trace Impedance (various trace types e.g. Microstrip, embedded Microstrip, Symmetric and Asymetric Stripline, Wire Microchip, Wire Stripline, Edge Coupled Microstrip and Stripline) PCB Crosstalk (Microstrip and Stripline) ■ LC L/T/Pi Match calculation ■ Coax Cable calculation (Standard and individual Types) ■ Amplifier and Attenuator cascade calculation ■ SWR / Reflection / Return loss conversion ■ Power Divider (Branchline, Ratrace and Wilkinson) ■ Capacitor Plate calculation ■ RLC Parallel, Series and Circuit calculation ■ Noise Figure conversion ■ Skin Depth calculation (various materials from Aluminum to Silver) ■ Butterworth Filter (also with plot of filter chart) ■ Chebyshev Filter (also with plot of filter chart) ■ R-C, L-C, R-L High/Low/Band-Pass Filter ■ RF Units conversion (quick conversion of frequently used units) ■ Air coil inductance calculation ■ Resistors, Capacitors, Inductors in Parallel / Series And there is much more... ■ Aktive Filter calculation tool ■ Antenna calculation tool ■ Delta Star calculation ■ Cable length / ampacity tool ■ PTC / NTC Temperature Resistance conversion ■ AC Ohms law tool ■ Zener diode circuit calculation ■ Constant current source tool ■ ASCII Table ■ Desktop calculator ■ Resistor/Capacitor/Inductor combinations tool ■ 4-20mA conversion tool ■ Passive cooling calculator ■ Audio Oscilloscope Please check out more screen shots on my website (WEBSITE Link on the left side). If you have questions, please feel free to contact me by using the Support button here, inside the App or on my website. Thank you! Marcus Roskosch

About

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.

Highlights
  • Fast voltage drop calculations
  • Built-in material database
  • Custom material support
  • Save circuit details
  • Unit conversion
  • Recommended wire size guidance
Features
Read 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

RF4 screens
Voltage Drop Calculators4 screens

Verdict

The call

The clearest difference is rating: RF at 4.9 against Voltage Drop Calculators's 4.0. RF also leads on ratings volume (22 vs 4) and iOS requirement (11.1 vs 15.6). Voltage Drop Calculators's advantage is price ($3.99 vs $7.99). On update cadence, ads, in-app purchases and monetization model 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

RF costs $7.99 and Voltage Drop Calculators $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

RF holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: RF has 22 ratings behind it against 4, so its average is the more settled of the two.

UpkeepUpdate frequency

RF ships an update every 4 months, Voltage Drop Calculators every 7 months. The most recent releases landed on September 22, 2026 and September 28, 2026 respectively.

Scorecard4 real differences · 6 level
RF versus Voltage Drop Calculators: the parameters behind the verdict, then further details
ParameterRFVoltage Drop Calculators
Price$7.99$3.99 — better
Rating4.9 (22 ratings) — better4.0 (4 ratings)
Positive reviews91.1% of reviews—
Number of ratings22 — better4
Update frequencyEvery 4 months — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.1 — better15.6
Further details — not scored
Size92 MB67 MB
Age rating4+4+
DeveloperMarcus RoskoschKantaben Gorasiya

Customer experience

RF

All ratings22 ratings
Positive95.5%
Neutral0.0%
Negative4.5%
Written reviews45 reviews
Positive91.1%
Neutral4.4%
Negative4.4%

Voltage Drop Calculators

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

None

RF

No in-app purchases

None

Voltage Drop Calculators

No in-app purchases

Questions

Is RF free?
RF costs $7.99, with no in-app purchases.
Is Voltage Drop Calculators free?
Voltage Drop Calculators costs $3.99, with no in-app purchases.
Which has better reviews, RF or Voltage Drop Calculators?
RF is rated higher. RF averages 4.9 out of 5 from 22 ratings, while Voltage Drop Calculators averages 4.0 from 4 ratings.
Do RF or Voltage Drop Calculators have ads?
Neither RF nor Voltage Drop Calculators shows ads.
Which is updated more often, RF or Voltage Drop Calculators?
RF ships an update every 4 months, and Voltage Drop Calculators every 7 months. Most recently, RF was updated on September 22, 2026 and Voltage Drop Calculators on September 28, 2026.

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