One of the best apps for anyone interested in electronics. More than 100 thousands users use this app in their work or study. This app has the following calculators and references:
• Datasheet search
• Resistor color and digit marking (4, 5 and 6 band color code; 2 symbols, 3/4 digit and EIA-96 code SMD resistors code)
• Electronic schematic symbols (IEC 60617, IEEE 315 and GOST standards)
• Pinouts Guide (DVI, USB, Display Port, VGA, HDMI, Thunderbolt, Apple, RS-232/422/485, ATX, RCA, MIDI, XLR, Audio Jack, Arduino, Orange Pi, STM32, ESP32, and Raspberry Pi)
• Ohm's law calculator
• AWG converter (wire diameter, cross-section area, resistance and maximum current)
• Resistor for LED
• Voltage divider
• Capacitor code
• Capacitor markings
• Capacitor ESR tables
• Frequency response curve calculation of passive filters (RC, RL, RLC, LC)
• Inductor color code
• Linear current regulator
• SMD packages list
• Reactance
• PCB trace resistance

Additionally, by purchasing the PRO version of the app, you will get access to additional tools:
• Diodes color code (Pro Electron, JEDEC and JIS-C-7012 standards)
• Linear voltage regulator
• Resistor value to color marking converter
• Voltage rectifier
• Series or parallel electrical components' connection calculator
• Diode voltage drop
• Minimum PCB trace width
• Analog to digital conversion

The PRO subscription is an auto-renewable subscription. The price of subscription is $1.49 per year, includes 3 months free trial. Price may vary by location. The free trial is available only for users who subscribe for the first time.
Payment will be charged to iTunes Account at confirmation of purchase or the end of the Free Trial Period, if any.
Account will be charged for renewal within 24-hours prior to the end of the current period, with the same amount as the first period.
Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period.
Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase.

Privacy Policy:
Terms of Use:

Ratings and Reviews

4.7 out of 5
3 Ratings

3 Ratings

i am dummm ,

Everything you need to get started!

This app is amazing! It has absolutely everything you could possibly need as a beginner to Electronics. I haven’t noticed any problems with it. And nothing is locked! With other apps, some of the features have a lock buy them telling you to get the full version. With this app you don’t feel like you’re getting left out on everything because they just don’t show you everything you can’t use. Get this app!

Developer Response ,

Thanks for a review. I hope that EE Helper will be helpful for your electronics study 🔋

to weak to continue ,


I’m an older guy 60 plus years old . This a world of information. I’m actually just a maintenance guy at a college. I share this app with several engineering students. They flipped out when they found this app.. Really you people did you’re home work . Thanks for sharing this app and information

Developer Response ,

Thank you very much for such a great feedback. I'm glad that this app helps you 🙂

Peeta Mellark #2 ,

Such a good tool

I saw that one of the reviews said that they did not show premium features but they do... I forgot about that when I realized that this was such a good tool I use the pinouts all the time. It has all the major USB ports and many others.... being only 13 I have absolutely no idea how these ports work. This app helps so much! Thanks!

Developer Response ,

Thank you for the review! Good luck learning electronics 🔋🛠😀

App Privacy

The developer, Rostyslav Dovhaliuk, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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