# RF-Toolbox Pro — High frequency Tools

> High-frequency electronics calculation and conversion tools for professionals and students. (iPhone/iPad app by Marcus Roskosch.)

- Source: https://appshunter.io/ios/app/rf-toolbox-pro/id593044099 (this page in markdown: same URL + `.md`)
- Developer: [Marcus Roskosch](https://appshunter.io/developer/334053438)
- Category: Productivity
- Price: $7.99
- Rating: 4.90/5 from 22 App Store ratings · 45 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.1 · 92 MB
- Languages: American English, French (France), German (Germany), Italian, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2013-01-20
- Data updated: 2026-08-28
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rf-toolbox-pro/id593044099/reviews.md

## What is RF?

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

## Key features

- 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

## Chart rankings

- #195 in Top Paid · Productivity (US App Store)

## Recent user reviews (10 of 45)

All indexed reviews: https://appshunter.io/ios/app/rf-toolbox-pro/id593044099/reviews.md

### 5/5 — Awesome app

*2026-01-31*

Awesome app

### 5/5 — Sehr gut

*2024-11-15*

Tolles Programm, sehr nützlich. Schön wäre es wenn es ebenfalls auf dem Mac laufen würde.

### 5/5 — Swiss Army knife for electronic engineers and hobbyists

*2023-03-25*

The app is practical, portable, affordable and most importantly, recommendable. 

It’s easy to use, continually updated and saves countless time hunting for that missing formula. It’s a go to app for hobbyists and professionals alike. 

Thank you Marcus for sticking at it.

### 5/5 — Just bought this

*2023-02-21*

Just got this App, and again I am amazed at how much work and effort this developer puts into his app.
I tried at one time making my own app, and although I was able to do simple apps, I gave up when trying to do more detailed and complicated app so I know a lot of work goes into it. One of the great features about all his apps is “none of that subscription garbage which other greedy money hungry developers push”, subscription is rubbish and makes no sense.
I have decided to compete with this developer and make a similar item to give him a run for his money, but I would strongly advise everyone to stick to his apps, unless you want to buy my useless app, 😂

### 5/5 — What a wonderful toolbox!

*2022-09-06*

I’ve just opened a color tool and enjoyed a wavelength slider with a 0.1 step! Thank you!

### 5/5 — A most excellent App

*2019-12-15*

Mr. Roskosch’s ETB  Is A “Killer App”...
Professional, Intuitive Expansive And Kept Up To Date!
I Highly Recommend This App For All Good People...
73
KS4ML

### 3/5 — 手册连接也不能打开

*2019-04-08*

什么情况，元件怎么不能连接成电路图，是右上角的编辑符号吗？为什么没反应

### 5/5 — A truly useful App

*2018-12-06*

I have been watching this evolve into a truly useful App , nice to have so much information a tap away

### 5/5 — Great app

*2018-11-08*

This is just a great app!

### 5/5 — Very Handy

*2018-11-08*

This is just a fabulous app for anyone working with RF. Especially handy when designing equipment at the component level and almost everything you need is all in one app.

## Frequently asked questions about RF

### What does RF-Toolbox Pro do?

RF-Toolbox Pro is a specialized application offering over 90 tools for high-frequency electronics. It assists RF professionals, radio amateurs, and students with complex calculations related to PCBs, filters, impedance, and various RF components.

### What are some key features of RF-Toolbox Pro?

Key features include PCB trace width and impedance calculations, LC/L/T/Pi match calculations, coax cable analysis, amplifier and attenuator cascade calculations, SWR/reflection/return loss conversions, and design tools for Butterworth and Chebyshev filters. It also provides RF unit conversions and more.

### How much does RF-Toolbox Pro cost?

RF-Toolbox Pro is a paid application. The provided data indicates it does not have in-app purchases or ads, suggesting a one-time purchase for full access to all its features.

### Who is the target audience for this app?

The app is specifically designed for individuals working with or studying high-frequency electronics. This includes RF professionals, radio amateurs, and students in related fields who require specialized calculation and design tools.

### What are common use cases for RF-Toolbox Pro?

Common use cases involve designing and analyzing PCBs, calculating impedance for various trace types, determining filter characteristics, performing RF unit conversions, and cascading amplifier or attenuator circuits. It's also useful for radio amateurs for antenna and general RF calculations.

## Version history (last 5 releases)

### 14.5.01 — 2022-09-12

This update includes the following changes and fixes:

◉ Further improvements for a next iOS Version

◉ Some bug fixes and improvements

◉ Several changes under the hood

Thanks for your great support and feedback which helps to further improve this App.

Please use the Contact Developer feature inside the App to contact me in case of questions or issues.

Stay safe and healthy! 

Best regards,

Marcus

### 14.0.4 — 2020-12-07

This update fixes a few remaining minor issues.

Best regards,

Marcus

### 14.0.3 — 2020-11-03

This update fixes a remaining iOS 14 bug where some images were not displayed correctly.

Best regards,

Marcus

### 14.0.2 — 2020-10-29

This update includes the following changes:

◉ Further iOS 14 improvements

◉ For the calculation Tools, it is now possible to save calculations under a name and reload them later

◉ Many changes in the Make section. 

◉ Fixes in the Voltage Regulator and constant Current Tools

◉ Small changes in the Active Filter calculation Tool

◉ In the SamacSys Component search Tool, you can now Bookmark components for later reference from the Bookmarks Tool

Please: If you like my App, please write a review or, in case of problems or suggestions, please use the Support button under Settings inside the App.

Thanks for your fantastic feedback which helped to continuously improve this App.

Stay safe and healthy!

Best regards,

Marcus

### 13.0.1 — 2019-11-26

This update contains several changes and improvements:

■ Additional iOS 13 compatibility

- a new File and PDF Viewer has been implemented
- iOS 13 page sheets are now supported
- and several additional changes to support iOS 13 have been implemented
- The minimal iOS Version requirement is now 10

■ Bug fixes

- Bug fixes in the C-Plate tool
- Bug fix of the Components tool which could only opened once
- Due to the new PDF Reader, data-sheets will now rotate correctly
- Printing from inside the Database tools (e.g. Transistors) no work correctly
- A bug which prevents to import Online projects was fixed (basically an iOS 13 bug)

■ SamacSys tool

I found that this tool often was underestimated. It is indeed a very powerful tool to find information like specs, data sheet and pin out of literally any component. The tool is now called Comp. Search to better suit to it's purpose. I have also implemented some improvements to this tool.

■ Attenuator tool

This tool now also calculates backwards based on the selected E-Series

■ Tables tool

- 3D Printing Filament types added
- Power over Ethernet POW Classes added

■ Circuits diagrams

One of the larger improvements is the use of the internal Circuit drawing feature for the tool diagrams. This way, the circuits (e.g. for the OpAmp Tool) benefit from the following improvements:

- Improved drawing quality
- Resistors will now either be displayed in Zig-Zag US or IEEE Style (depending on the country setting)
- Where possible, the circuits now show the calculated component values inside the diagram
- All tools now offer Printing and PDF Exporting which also includes the circuit diagram

■ Circuit Editor

- New Setting: "Adjust board to fit" under (File -> Parameters) allows to change the board size to fit the whole circuit so you don't have to move components around if the board is too small.
- Circuits can now also be printed

■ Improved File Viewer, Print and export capabilities

Either from inside the tools or from inside the File Viewer, content like the Tool results can now be exported as PDF as local file or printed

■ Other improvements

- A new Tool SMPS for calculating Flyback Transformers for Switched Mode Power Supplies as been added
- Several images have been re-created in higher quality
- The Formula tool has also been improved

In case of questions, issues or suggestions, please use the Support button inside the App of the Form on the website.

Thank you so much for your support.

Please let others know if you like this App to keep it going.

Thank you so much!

Best Regards,

Marcus

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## More apps by Marcus Roskosch

- [iCluster - DX-Cluster database](https://appshunter.io/ios/app/icluster-dx-cluster-database/id334053435)
- [Electronic Toolbox Pro](https://appshunter.io/ios/app/electronic-toolbox-pro/id339158729)
- [SmartSDR™ - FlexRadio Systems®](https://appshunter.io/ios/app/smartsdr-flexradio-systems/id1089157289)
- [SamacSys](https://appshunter.io/ios/app/samacsys/id1454509750)
- [SDR-Control for Icom](https://appshunter.io/ios/app/sdr-control-for-icom/id1614141094)

All apps by Marcus Roskosch: https://appshunter.io/developer/334053438

## Related topics

[toolbox rf](https://appshunter.io/ios/topics/toolbox-rf)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*