Electronic Toolbox Pro

I have this app for many years, use it often, and keep discovering new functions. I would happily donate, but mr Marcus refuses even to provide the option. A true internet hero.

This is my most favorite app, And use it many times, for at work and hobby. I like the most the calculation tools for frequency’s, resistor networks, the easy way to calculate with ic 555. But also the long list of IC’s and transistors data, and compare list and with pin outlays. Coil calculations and a oscilloscope!
I am use it for about 10 years and still happy with it. And still it is developing with new updates! Great!

Very comprehensive reference with lots of useful calculators. Well worth the money.

I have tried a lot of different tools on my phone and iPad but this one and the RF toolbox are the only two who stayed. Everything you need is there.
App is updated very frequently. Keep up the good work!

I have written two reviews on this app throughout the years that I have been using it and it is easily one of the best purchases I have made. Really a great app, keep up the good work!

This is really a great app, use it weekly, contains so much information, it is hardly believable. Really. But unfortunately now the developer is abandoning iOS9, which is the last OS that my iPad 2 can have. The iPad is in perfect operating condition, but I am slowly forced to throw it away as one after the other application deserts me. Not green at all.
Marcel Payens, Tilburg, the Netherlands

This is one of the best app I purchased on my iPad. Almost every component and functionallity is avaialble, including datasheets, function generator, arduino, beagle, pi pinouts and fact.
Excellent work!

I have been using this app for a couple of years more now and it is still truly excellent. Very useful features and it has become a tool I enjoy using on a daily basis. Regular updates and added features throughout all these years. A friendly and dedicated developer. Highly recommended!

The developer, Marcus, really makes an effort to improve an already great app. It basically comes down to a engineer guide book with all those little tips and formulas in one place. I have a paper booklet but I tend to grab this one first. I did not yet try the project feature nor the schema drawing but that should be usefull for the first sketches ( which I seem to misplace currently when using paper). The price is higher then usual game or whatever app but think of it as a paper compendium that you would normally buy and this one is growing over time and is maintained over the iOS versions.

Essential app for 'makers'. It has all the formulas, lookup tables and most pinouts you'll need for most projects (well for mine anyway).
I have used this app for several years now, and every time I open it, it seems to have a new feature, just when I thought it already had everything you could expect for the price. At no extra cost. The developer is just that awesome.

The app has a lot of great functions and tools, also data sheets are available for building projects.
I also have al lot of respect for the response on a mail I send, within 24 hours I received a mail back!
I say try the app you wouldn't regret buying it!

The app has a lot of functions but it's in my eyes incomplete. Some functions are very useful and others like schematic of resistors for example, you can add as many resistors if you want but you can't replace (one) off them //, series or put a source or something else in it.
First thought, I guess it's a bit wasted of my money...

Just what the title says, lots of information for a little price and kept up to date with periodically new releases! Super!

I have been using this app for a couple of years now and it is truly excellent. Very useful features and it has become a tool I enjoy using on a daily basis. Regular updates and added features throughout the years. A friendly and dedicated developer. Highly recommended!

A very cool collection of tools you can use on designing your projects. Saved me a lot of time searching the web for all information needed. Updated very regular with additional info and tools.
Keep up the good work.

A very cool collection of tools you can use on designing your projects. Saved me a lot of time searching the web for all information needed. Updated very regular with additional info and tools.
Keep up the good work.

Handig als naslagwerk en om even wat te berekenen. Vraag me wel af of er inmiddels niet teveel in zit.

Ik gebruik de app nu enkele jaren en ben er 100% tevreden over. De updates hebben steeds waardevolle uitbreidingen gebracht. Ik kan de app niet meer missen op mijn werkplek! Vrijwel alle databoeken uit het verleden ( was ruim 1,5 meter op de plank) zijn geslonken naar < 10 cm. Alleen een paar boekjes uit de eerste jaren van mijn elektronika geschiedenis heb ik uit nostalgie bewaard.
Henry pe0thz.