# Electronics Engineer Helper — Calculators and references

> Electronics calculators, datasheets, schematic symbols, and pinout guides for engineers and students. (iPhone/iPad app by Rostyslav Dovhaliuk.)

- Source: https://appshunter.io/ios/app/electronics-engineer-helper/id896429646 (this page in markdown: same URL + `.md`)
- Developer: [Rostyslav Dovhaliuk](https://appshunter.io/developer/896429649)
- Category: Productivity, Education
- Price: Free with in-app purchases
- Rating: 4.80/5 from 432 App Store ratings · 168 written reviews indexed
- Age rating: 12+
- Requires: iOS 17.0 · 88 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Norwegian Bokmål, Polish, European Portuguese, Russian and 7 more
- Released: 2014-07-28
- Data updated: 2026-08-29
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/electronics-engineer-helper/id896429646/reviews.md

## What is Electronics Engineer Helper?

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/

## Key features

- Datasheet search
- Resistor color code calculator
- Electronic schematic symbols
- Pinouts guide
- Ohm's law calculator
- AWG converter
- Unit converter

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 1 Year Subscription | $4.89 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime PRO Version | $12.49 | one-time |


## What do users think of Electronics Engineer Helper?

Overall sentiment: positive

**Pros**

- 🚀 Useful tool
- 👍 Comprehensive reference
- 👍 Intuitive and well-designed
- 👍 Saves time and effort
- 👍 Excellent for beginners and professionals
- 👍 Reliable and bug-free

**Cons**

- 💰 Some advanced features require paid subscription
- 🇷🇺 Some content in Russian language

**Commonly reported bugs**

- Incorrect resistor color code display for some values
- In-app purchase option not working for some users

**Most requested features**

- Add more circuit schematics and examples
- Include ASCII code to decimal, hex, and octal conversion
- Expand the pinout section with more details
- Add active filter (RC, RL, RLC, LC) calculators
- Include digital to analog converter, transistor, and transformer calculators

## Recent user reviews (10 of 168)

All indexed reviews: https://appshunter.io/ios/app/electronics-engineer-helper/id896429646/reviews.md

### 5/5 — Лучшее приложение для инженеров

*2026-07-29*

Множество функций, помощи в работе как начинающим и опытным инженерам, дай бог тебе здоровья, берите Прошку не пожалеете, спасибо!

**Developer response:** Большое спасибо за отзыв и финансовую поддержку приложения!

### 5/5 — Хороший помощник

*2026-07-10*

Пользуюсь постоянно, только 5 звезд. Спасибо!

**Developer response:** Спасибо за отзыв!

### 5/5 — 👍

*2026-07-05*

👍

**Developer response:** 🤝

### 5/5 — Рекомендую

*2026-06-25*

Однозначно, приложение полезное!
Цена за Pro версию оправдана

**Developer response:** Спасибо за отзыв и финансовую поддержку приложения!

### 5/5 — EE Helper

*2026-06-17*

👍

**Developer response:** 🤝

### 5/5 — Хорошее приложение

*2026-06-16*

Помогает быстро найти нужную информацию, хорошо организовано.

**Developer response:** Благодарю за отзыв

### 5/5 — Топ

*2026-06-14*

Однозначно топ

**Developer response:** Спасибо

### 5/5 — Great App

*2026-05-28, version 26.06*

Easy to use, had all the information i needed to help me figure out how electronic stuff works.

### 5/5 — Отличный помомошник

*2026-05-23*

Спасибо за развитие ПО и Ваш труд!

**Developer response:** Благодарю за отзыв!

### 5/5 — Great app

*2026-05-18, version 26.05.2*

I use the app every day it it’s a great investment lol

## Frequently asked questions about Electronics Engineer Helper

### What does the Electronics Engineer Helper app do?

This app offers a wide range of calculators and reference tools essential for electronics work and study. It includes features like datasheet search, resistor and capacitor code calculators, schematic symbol viewers, and pinout guides for various connectors and devices.

### What are the key features of the free version?

The free version provides over 100,000 users with access to numerous calculators and references. These include tools for resistor and capacitor coding, electronic schematic symbols, pinouts for common ports, Ohm's law, AWG conversion, and many more circuit and component calculations.

### What additional tools are available in the PRO version?

The PRO version unlocks advanced features such as SMD component marking codes, diode color codes, linear voltage regulators, voltage rectifiers, series/parallel component calculators, and tools for analog-to-digital conversion and signal converters.

### Is this app compatible with my device?

While specific compatibility details are not provided, the app is designed for mobile devices and is used by a large number of users, suggesting broad compatibility with modern smartphones and tablets running Android. It is not explicitly stated if an iOS version is available.

### How can this app help me with my electronics projects?

The app serves as a portable toolbox for electronics engineers and students. It simplifies complex calculations, helps identify unknown components through color codes and markings, provides quick access to pinout diagrams, and offers reference data for various electronic standards and components.

## Version history (last 5 releases)

### 26.08 — 2026-08-18

- [PRO] Solar string dimensioning calculator. Determines the minimum voltage and current ratings a charge controller or inverter needs for a PV array, from the panel specs, temperature coefficients and site temperature extremes.
- [PRO] Solar cable and fuse selection calculator. Picks the conductor sizes, string fuse and disconnect ratings for a PV array under NEC or IEC rules.
- RMS Converter. Converts between peak, RMS and peak-to-peak voltage or current for seven waveform shapes, and reports the crest factor and average value of each.
- New pinouts: Ethernet PoE, ATmega328P, ATtiny85, ATtiny84A, ATmega32U4, ATmega4809.

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

### 26.07.2 — 2026-07-19

- [PRO] Junction temperature calculator. Finds the junction temperature or dissipated power from ambient temperature and thermal resistances, with or without a heatsink, and plots the power derating curve.
- New pinouts: SMEMA, two RS-485 variants, and RJ11/RJ14/RJ25.
- Area and volume units in Unit Converter.
- Additional sources for datasheet and equivalent parts search.

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

### 26.07 — 2026-06-22

- Ideal transformer calculator. Finds unknown winding turns, voltages and currents from the turns ratio, or the winding currents from the rated power.
- [PRO] Turns-per-volt calculator. Determines the volts per turn and number of turns for a transformer winding from operating frequency, effective core area and maximum flux density.
- Cable voltage drop calculator displays the formulas used in the calculation.
- Search bar in the tools list.

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

### 26.06 — 2026-05-25

- 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

### 26.05.2 — 2026-04-29

In this update:
- Battery life calculator. Estimates runtime of a battery pack from its chemistry, cell configuration, capacity, depth of discharge and load. Advanced mode additionally accounts for internal resistance, C-rate, Peukert exponent and energy conversion efficiency, and plots the discharge curve.
- [PRO] Series and parallel connection calculator now accounts for component tolerance. Select an E-series for each resistor, capacitor or inductor to see the minimum and maximum of the equivalent value. Entered components are also kept between application relaunches.
- [PRO] PCB trace width calculator now also shows the trace cross-section area and the minimum via diameter and barrel area required to carry the same current.
- Unit Converter now supports angle and torque measurements.
Big thank you to everybody who subscribed or purchased the app's 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

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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 2026-08-29.*