Digital toolbox for electronics engineers and electricians. Calculators and references for beginners and professionals — for work, study, DIY, and repair. Used by over 100,000 users. Completely ad-free.
Included tools:
• 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
• Active, apparent and reactive power
• 555 waveform generator
• Operational amplifiers
• RLC circuit
• Number conversion
• Unit converter
• Cable voltage drop
• NTC thermistor resistance
• Logic gates
• RC circuit
• Decibels calculator
• 25-pair cable color code
• Fuse color marking
Additionally, by purchasing the PRO version of the app, you will get access to additional tools:
• SMD components marking codes
• 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
• Attenuators
• 4-20 mA signal converter
• Thermocouple calculator
• Resistance thermometer
• Buck switching voltage regulator
• Wire resistance
Privacy Policy: https://www.eehelper.app/ios/privacy/
Terms of Use: https://www.eehelper.app/ios/terms/
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 🔋
Easy to use, Awesome, Well designed!!!
Mosefts Rule
I have used many helper apps before, none have ever had this depth, precision, and though that was put into this one. While not only visually well thought out, the tools are sorted into logical categories that make them easy to find. The best part is that the pro features are not the core features of the app like they are in many other apps, for once I have an app the is helpful and functional without being stuck behind a paywall! While I have yet to get the pro features, they only add to the apps usefulness, rather than detracting for its core functionality like every other app for this purpose I have ever used. I am also impressed with the software. There are no hidden bugs! Nothing that you get stuck on, that takes a few tries, or that otherwise wastes your time. This app works well reliably and has saved me so much time and headache. I would recommend it to any electrical engineer out there looking for a helper.
Developer Response
Thank you very much for the detailed review. I'm very glad that the app suits your needs 🙂
Blown Away!
wiseshanks
I’m a electronics hobbyist and dabble in it at work as well. I was looking for an app for resistor color coding and noticed the high reviews for this one so downloaded it. When I started to skim the app I was completely blown away with how in depth and comprehensive it was! This is the best technical app I’ve ever come across! If you use electronics in any way, you have to download this app! I immediately went and bought the Pro version just to support the creator!
Developer Response
Thank you very much for the review and financial support 🙂
Excellent data all at one place
Farooqi
One of the finest application, which I liked it has a lot more than what I was looking for. I would highly recommend, and I would really be saying thank you to the maker of this app. This is really so good app for the enthusiast hobbies. Specially, I am a raspberry and ESP user and I loved looking every detail about the pinout and this is really helpful for me
Developer Response
Thank you very much for such an in-depth review of the app 🙂
- Air-core coil calculator. Determines inductance or required number of turns of a single-layer solenoid from former diameter, wire diameter, insulation thickness and gap between turns. Also reports wire and coil length.
- [PRO] BJT voltage divider bias calculator with three modes: voltage and current ratios, target operating point voltages, or a given set of resistors.
- Additional pressure measurement units in Unit Converter.
- This is the last release supporting iOS 16. Please update to a newer iOS version to continue to receive updates.
Big thank you to everybody who subscribed or purchased the PRO version. Your support helps to make this app even better. If you like this app, please rate it and leave a review.
Regards,
Rostyslav
Version 26.06
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
The developer indicated that this app supports the following accessibility features. Learn More
