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Electronic Toolbox Pro

By Marcus Roskosch

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The *** ORIGINAL *** Electronic Toolbox Pro App
Electronic reference and calculation resource for Professionals, Hobbyists, HAMs and Students right at your fingertips!

Best of all: Continuously improved since 2009 - FOR FREE - NO IN APP PURCHASE - NO FAKE REVIEWS!

What users wrote about this app:

Well worth the money *****
I researched all EE apps before buying this one and I have to say that this one is the best by far. The developer is very accommodating to requests and suggestions and provides updates frequently. Very, very happy with this app.

Simply brilliant *****
I don't normally review apps but I was so impressed with this one I felt I had to make a brief comment. Buy it, I promise you won't be disappointed.

Supports iOS 10 back to iOS 9 and all Apple devices from iPod Touch, all iPhone and iPad models including 7 plus and iPad pro

See the online Manual at

Feature Highlights:
■ NEW: Circuit Editor (Beta)
■ Most comprehensive and complete Electronics app available
■ Designed for Novices as well as Experts
■ Numerous individual tools from "A" like ASCII Table to "Z" like Zener Diode calculation. If something is missing, just let me know
■ Provides wide variety of simple and complex tools, such as the resistor color code conversion to the PCB Trace width tools
■ Various calculation tools available, such as the NE555 circuit calculation and the passive cooling calculator
■ Includes reference tools with millions of component specs for ICs, Transistors, FETs, Controllers with parametric searches, pinout and cross reference information, and complete datasheets
■ Provides information about Batteries, Drill sizes, Hybrid Amplifiers, Socket pinouts, package sizes and much more
■ Includes conversion tools, such as the Unit conversion tool, the HEX/Decimal/Float Tool, Frequency and AWG / SWG tools
■ Paremetric search for Components with certain specs and cross references
■ Global search for terms or components across all tools
■ Customizable arrangement of tools for quick and easy access
■ Includes a scientific desktop calculator, a frequency generator, and an oscilloscope
■ Comprehensive reference glossary (english only)
■ Content can be updated "over-the-air" and amended quickly and easily
■ Store diagrams, documents, and specs of a project
■ iCloud and Dropbox support
■ No ads or in-app purchases
■ Can be used without Internet access
■ Special keyboard available for quicker entry of SI units
■ And much more...

For further information about this App, just have a look at my website: ■ ■ or just send me an E-mail.

Version 10 of the app has just been released and as always, this update is FOR FREE to all users of Electronic Toolbox.

At this point, many thanks for the ideas and suggestions I have received from the huge user community. You helped me to keep on improving my app with every new update.

This App will continue to live and grow over the time. So I still look forward to all additional ideas, suggestions or even criticism so that I can continuously improve my App.

Best regards,


Read more on :

What's New in Version 10.0.1

This version contains the following changes and improvements:

■ Formula bug fixed
■ iOS 10 adaptions
■ 3D-Viewer bug fixed
■ Sound Generator now allows to select output device
■ Projects can now be shared via Email
■ Improved integration of the Tools to the Projects

■ Added: 2-Digit SMD Codes
■ Added Tool: TI LaunchPad
■ Added Tool: Audio Amplifier (1500+ Hybrid amplifiers with circuit diagram)
■ Added Tool: Components (Identify components by Name or Picture)

■ A 'real' Manual is now available (also available online at :

■ New: Now you can create and draw your own Circuit Diagrams (Beta)

Thanks for your fantastic support!



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Customer Reviews

Extremely Comprehensive-Worth it!

I've been trying to learn how to create circuits for the past year or so and this app is by far the greatest reference I've come across. In addition to the vast amount of data sheets and various formulas, there is a way to make a list of parts one may need to complete a project which is very useful. Finally, the developer is very active and always looking for ways to improve the app, if he/she keeps that mind set(without adding too much in one app), this may be the go to reference for electronics and components. Great job and I definitely recommend the app!

Very Helpful App

I have been using this app for several (5+?) years now to help me -- an electronics newbie -- understand components as I try to design various special purpose circuits. It has been a great help.

Over the years I have been impressed with the updates. New functions are added, bugs get fixed, and the even the interface gets improved to handle the expanding capabilities. I always has been great and it just keeps getting better.

Electronic Engineer...

I am honestly amazed with this app quality. Marcus has done an excellent job in organizing the information and references in an intuitive way. The only drawback I faced is how to use the oscilloscope with my iPad (as I believe is embedded and there is not mic connector, it resembles me the one used in a well known toy used in schools to teach electronics to kids). Other than that is a really good app, nicely done. It deserves every penny invested on it.

Electronic Toolbox Pro
View in iTunes
This app is designed for both iPhone and iPad
  • $6.99
  • Category: Productivity
  • Updated:
  • Version: 10.0.1
  • Size: 132 MB
  • Languages: English, French, German, Italian, Russian, Simplified Chinese, Spanish, Traditional Chinese
  • Seller:

Compatibility: Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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