# Electronic Toolbox Pro — Electronics Engineering

> All-in-one electronics engineering toolbox with circuit editor, calculators, and component references. (iPhone/iPad app by Marcus Roskosch.)

- Source: https://appshunter.io/ios/app/electronic-toolbox-pro/id339158729 (this page in markdown: same URL + `.md`)
- Developer: [Marcus Roskosch](https://appshunter.io/developer/334053438)
- Category: Productivity, Education
- Price: $12.99
- Rating: 4.70/5 from 245 App Store ratings · 323 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.1 · 201 MB
- Languages: American English, French (France), German (Germany), Italian, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2009-11-20
- Data updated: 2026-08-27
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/electronic-toolbox-pro/id339158729/reviews.md

## What is Electronic Toolbox Pro?

The *** ORIGINAL *** Electronic Toolbox Pro App
"The best and most complete Electronics App on the App Store" for Professionals, Hobbyists, Makers, 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 14 back to iOS 11 and all available Apple iPhone and iPad models.

See the online Manual at http://go-to.me/etb-manual

Feature Highlights:
■ Circuit Editor
■ 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
■ Parametric 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 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...

Now also includes reference tools for major boards like RaspBerry Pi, Arduino, BeagleBone, TI-Launchpad, Nano Pi, Orange Pi, Banana Pi, Odroid, Cubieboard and SparkFun!

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

The new Version 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,

Marcus

Read more on : http://go-to.me/etb

## Key features

- Circuit Editor
- Component reference with parametric search
- Numerous calculation tools
- Unit and HEX/Decimal conversion tools
- Scientific calculator, frequency generator, oscilloscope
- Project diagram and document storage
- Reference tools for major development boards

## What do users think of Electronic Toolbox Pro?

Overall sentiment: positive

**Pros**

- 🚀 Comprehensive database
- 🔍 Detailed component information
- 👍 Intuitive and easy to use
- ⚡ Frequent updates
- 🛠️ Useful calculators and tools
- 💡 Valuable for professionals and hobbyists

**Cons**

- 🐛 Occasional crashes or bugs
- 🔍 Missing some component data
- 🔌 Compatibility issues on older devices

**Commonly reported bugs**

- Equation disappearing in calculator
- Circuit editor not working with touch input

**Most requested features**

- More microcontroller and SBC support
- Circuit simulation and design capabilities
- Educational resources and tutorials
- Improved circuit editor functionality

## Recent user reviews (10 of 323)

All indexed reviews: https://appshunter.io/ios/app/electronic-toolbox-pro/id339158729/reviews.md

### 5/5 — A truly useful app!

*2026-03-22, version 14.5.01*

Has everything you could possibly need as an electronic technician or experimenter. A+

### 5/5 — Sehr begeistert

*2025-10-08*

Ich nutze es schon seit Jahren, und es gibt schon seit Jahren Updates ohne nervendes monatliches Abo.

### 5/5 — Once

*2025-09-22, version 14.5.01*

You only have to use this app once to understand how much information is now at your fingertips. And the more you use it the more you will discover how detailed it gets. Then you’ll be amazed at how often the app is updated and maintained. I have used numerous electronics apps over the years, this is the one that hasn’t been removed from my devices.

### 5/5 — Mr

*2025-04-16, version 14.5.01*

THIS IS A FANTASTIC APP. I HAVE HAD IT FOR ABOUT 4 MONTHS BUT IT STILL SURPRISES ME WITH THE DEPTH OF KNOWLEDGE AND USES IT CAN BE PUT TO. AS A TEACHER OF ELECTRONICS I FIND IT INVALUABLE. WHEN MY IPAD WAS STOLEN I HAD TO SPEND HOURS SEARCHING FOR THE SAME DATA, AND IT WAS NEVER PRESENTED IN SUCH A GREAT FORMAT. THE APP WRITER NEVER RESTS ON HIS LAURELS AND IS CONSTANTLY ADDING ORE USEFUL FUNCTIONS.

### 5/5 — Super

*2025-03-17*

J’ai cette appli depuis bon nombre d’années une appli qui est suivit pas ses créateurs avec des mises à jour régulières indispensables sur bien des domaines je conseille sans modération !!

### 5/5 — This is a very handy resource for electronics

*2025-03-15, version 14.5.01*

I won’t say I use this app every day but when I need it it always provides the answers I need. Great app.

### 5/5 — ExceptionalToolbox Pro Version

*2025-03-13, version 14.5.01*

Exceptional toolbox with great content, easy to visualize the devices and select. A must for anyone from professional EE to DIYer.

### 5/5 — Best app

*2025-01-19, version 14.5.01*

This is one of the apps I use on a daily basis for electronics and electrical repair, this is not available on Samsung so I will never switch phones I can’t loose this app

### 1/5 — Misleading

*2025-01-11, version 14.5.01*

The image of the page showing conponents shows vacuum tubes, but after purchasing, apparently, tubes are not available to use to construct circuits.

### 5/5 — Logiciel utile

*2024-12-14*

Logiciel utile aussi bien à l’amateur d’électronique qu’aux professionnels du domaine par la possibilité de faire des calcules rapidement sans avoir à rechercher les formules pour par exemple calculer un circuit pendant un temps mort Concepteur à l’écoute des utilisateurs

## Frequently asked questions about Electronic Toolbox Pro

### What does the Electronic Toolbox Pro app do?

This app serves as a comprehensive electronics engineering toolbox for professionals, hobbyists, and students. It offers a circuit editor, a wide range of calculation and conversion tools, and extensive reference materials for electronic components and development boards.

### What are the key features of Electronic Toolbox Pro?

Key features include a circuit editor, a vast collection of individual tools from ASCII tables to Zener diode calculations, various simple and complex calculation tools like resistor color code conversion and PCB trace width, and extensive component reference data with parametric searches and datasheets.

### How much does Electronic Toolbox Pro cost?

The app is a paid application and does not feature any in-app purchases or advertisements. It has been continuously improved since 2009, with updates provided for free to all users.

### What devices is Electronic Toolbox Pro compatible with?

The app supports iOS 14 back to iOS 11 and is compatible with all available Apple iPhone and iPad models. It can also be used without an internet connection.

### Who would benefit from using Electronic Toolbox Pro?

This app is ideal for electronics professionals, hobbyists, makers, HAM radio operators, and students who need quick access to a wide range of engineering tools, calculations, and component specifications on their mobile devices.

## Version history (last 5 releases)

### 14.5.01 — 2022-09-13

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 — 2020-12-02

This update fixes a few minor remaining issues before the next larger update.

You all keep safe and healthy!

Thanks for you help!

All the best,

Marcus

### 14.0.1 — 2020-10-20

This update includes the following changes:

■ NEW:

- Further iOS 14 improvements

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

- New Lumen Tool to calculate between Lumen and Watts

- New Photo MOS Relay Tool

- New Relay driver Tool for designing Relay driver circuits

- New Legacy Computer Socket Section with pinouts for C64, Vic/VC20, C128

- Teensy 4.0 and 4.1 support added

- Support for Arduino Uno WiFi REV 2

- Adafruit Playground Express added

- A few new Op-Amps have been added

- Further improvements in the ESP32 Tool

- New ESP8266 Tool


■ CHANGES AND IMPROVEMENTS:

There are many changes in the Make> section. This section is now more file centric and has received a new File Manager Tool. From here, you can now open all Projects, Circuits, PDFs and so on. You can copy, rename, delete, print and export files from here as well.

■ BUGFIXES:

- Fixes in the Voltage Regulator and constant Current Tools

- Small changes in the Active Filter calculation Tool

- Fixes in Tubes 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

### 13.0.2 — 2020-01-14

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) now 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 -> Board settings) 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
- It is not possible to save circuits as PDF or sent them as circuit file via Email from inside the Circuit Editor

■ 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 Formulas 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

### 12.3.2 — 2019-06-30

This is a maintenance update with a few fixes and some improvements:

■ A new Tool Regulators was added 
■ Raspberry Pi 4 now supported
■ Fixed a capacitor tool bug
■ Fixed a bug which might have crashed the App in the Two-Tone Tool
■ Several changes in preparation of anything that may come up in a few month

As usual, some additional minor requests have been implemented and some bugs were fixed.

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

## Apps similar to Electronic Toolbox Pro

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [EE ToolKit PRO for iPad](https://appshunter.io/ios/app/ee-toolkit-pro-for-ipad/id393145367) | 4.8 (79) | $8.99 | Productivity |
| [EE ToolKit PRO](https://appshunter.io/ios/app/ee-toolkit-pro/id368780426) | 4.9 (293) | $12.99 | Productivity |
| [iCircuit](https://appshunter.io/ios/app/icircuit/id383359044) | 3.8 (134) | $12.99 | Productivity |
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| [Calctronics: Circuit Calc Pro](https://appshunter.io/ios/app/calctronics-circuit-calc-pro/id1583600520) | 4.3 (3) | $2.99 | Productivity |
| [CircuitShepherd](https://appshunter.io/ios/app/circuitshepherd/id1598606653) | 1.5 (2) | Free | Productivity |

## More apps by Marcus Roskosch

- [iCluster - DX-Cluster database](https://appshunter.io/ios/app/icluster-dx-cluster-database/id334053435)
- [RF-Toolbox Pro](https://appshunter.io/ios/app/rf-toolbox-pro/id593044099)
- [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

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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 2026-08-27.*