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Electronics Engineer Helper

Name: Electronics Engineer Helper
Rating: 4.8 (427 reviews)

Rostyslav Dovhaliuk

Calculators and references

Open in App Store ↗

427 Ratings

4.8

★★★★★

Age Rating

12+

Years

Developer

Rostyslav Dovhaliuk

Language

+16 More

Size

90.2

Information

Apple ID896429646

Bundle IDcom.rd.eehelper

SellerSeller

Min iOS17.0

Device familiesmac, iphone, ipad

Released2014-07-28

WebsiteLink ↗

Privacy policyLink ↗

Preview 3 platforms

iPhone 9 images

iPad 9 images

Mac 9 images

What’s New Version 26.07

- 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

Description

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/

In-App Purchases US pricing

PRO Subscription Subscription

1 Year Subscription · Yearly 1-month free trial$3.99

One-Time Purchases

Lifetime PRO Version$11.49

Capabilities

In-App Purchases

Accessibility

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Version history 25 versions

Build 886271467v26.072026-06-22 07:22:05

Build 885862050v26.062026-05-25 02:37:09

- 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

Build 885024541v26.05.22026-04-29 05:27:01

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

Build 884843890v26.052026-04-27 03:06:08

Build 883416753v26.042026-03-30 20:15:47

In this update: - Differential amplifier calculator. Solve for any unknown parameter (resistor values, input or output voltages) in a differential op-amp circuit. Calculates inverting and non-inverting gain. - [PRO] Wire resistance calculator. Determine the DC resistance of a conductor based on its material, cross-section, temperature and length. Supports AWG, IEC 60228 standard sizes, and custom circular or rectangular cross-sections. Also calculates voltage drop and dissipated power. - Pinouts for Orange Pi 4 Pro and Zero 3 single board computers. 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

Build 883262283v26.032026-03-11 23:31:27

In this update: - Section switch at main menu. It allows to quickly switch between list of all, favorite and recently used calculators. - [PRO] Ability to add your own SMD components marking codes. - Updated Reactance Calculator. It is now possible to calculate not only reactance but also capacitance or inductance and frequency. - [iOS 17+] ESR table shows lower and upper bounds of expected capacitance. 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

Build 882511592v26.022026-02-17 21:44:24

In this update: - [PRO] Square root scale type in 4-20 mA current loop calculator. - Color code tool for decoding marking of fuses. - Ability to edit individual bits in Number Converter. 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

Build 881805204v26.012026-01-26 19:25:37

In this update: - [PRO] Updated the database of SMD components’ markings. It now stores 518 thousand components and is available without Internet access. - Updated ESP32 pinouts. - Capacitor code calculator now additionally displays calculated capacitance with milli, micro, nano and pico prefixes. - Improved contrast of some elements when a dark color scheme is used. 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

Build 881094227v25.122025-12-31 03:45:55

In this update: - [PRO] Resistor voltage divider calculator for DC buck voltage converter. - 11 pinouts of PCI Express M.2 interface. - Search bar in pinouts list screen. - [PRO] Pt(391)46 and Cu53 resistance temperature detectors. - RC circuit calculator automatically saves entered values between application relaunches. - Small change of Ohm's law formula selection wheel. May all your wishes come true in 2026. Happy New Year! Regards, Rostyslav

Build 879450328v25.112025-11-19 14:59:40

In this update: - Apple Shortcuts support. Add frequently used tools to home screen using integration with Apple Shortcuts. - [PRO] Type L thermocouple. - [PRO] New types of resistance temperature detectors. - New SATA pinouts. - Updated app icon for iOS 26. 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

Build 878151485v25.102025-10-10 07:19:33

In this update: - [PRO] New amplitude-phase frequency response plot (Nyquist plot) in passive filter editor. - Ability to turn off display sleep while the app is open in app settings. - Color code tool for decoding marking of 25-pair cables. - Vietnamese and Thai localizations. 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

Build 877082541v25.082025-08-24 08:01:14

In this update: - Passive filter editor now also shows phase response curves. You can also customize the measurement units for better analysis of your filter designs. - Unit converter now supports kg/cm2 pressure 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

Build 876057392v25.072025-07-04 06:14:43

In this update: - Custom LED models. Create and save your own LED specifications with threshold or voltage-current table simulation methods. 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

Build 874441347v25.052025-05-01 09:13:07

In this update: - [PRO] Platinum RTD calculator. - Updated the formulas for calculating wire ampacity in the AWG calculator. 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

Build 872524481v25.022025-02-16 02:34:12

In this update: - [PRO] Ability to specify arbitrary analog signal range bounds in 4-20 mA current loop calculator. - Ability to sort saved datasheets in library. - Pinout of IEEE 1394 / FireWire interface. - Minor update of Raspberry Pi pinouts. 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

Build 871697581v25.012025-01-13 00:15:09

In this update: - When using iOS 17 or newer, the ESR tables reference of electrolytic capacitors will have an updated look with ability to show ESR values only for specific operating voltages or capacitances. 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

Build 871211554v24.122024-12-17 19:59:53

In this update: - Pinout of Flipper Zero. - Fixed error in images of NOT and BUFFER logic gates. 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

Build 870718448v24.11.32024-11-27 09:11:35

In this update: - [PRO] Passive Filters calculator shows formulas used to calculate the signal magnitude. - Ability to add PDF files from external sources to Datasheet Library. - Fixed alignment of pins depiction in DVI pinouts. 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

Build 870315910v24.112024-11-10 08:18:45

In this update: - When using iOS 18, any list of electronic schematic symbols can be translated into the app's current language. 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

Build 870321235v24.11.22024-11-10 18:14:40

In this update: - When using iOS 18, any list of electronic schematic symbols can be translated into the app's current language. - Internal stability improvements. 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

Build 869502550v24.10.22024-10-06 02:56:22

In this update: - Pinout of LubanCat 4 single board computer. - Internal optimizations. 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

Build 869403251v24.102024-10-01 16:34:10

In this update: - [PRO] Ability to add tags for saved datasheets. - [PRO] Current loop calculator supports other analog signal types besides the 4-20 mA. - Other small improvements. 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

Build 869016156v24.092024-09-15 18:51:41

In this update: - New pinouts of various boards based on ESP8266 chip. - Application icon supports iOS 18 dark and tinted modes. - Possibility to view additional information about SOT or diode package at SMD packages chart. - Other small improvements. 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

Build 865758065v24.062024-06-19 13:42:19

This summer, the app is celebrating its 10-year anniversary! I would like to take a moment and thank you for being a part of our customer community. In this update the following changes have been made: • [PRO] Thermocouple calculator. • Slightly decreased the application size. • Fixed the missing animation of selected pin after switching the app between background and foreground. • Fixed the inability to enter zero in some input fields of 4-20 mA calculator • Added Polish localization. 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

Build 865322675v24.042024-04-21 09:21:41

In this update: • Decibels Calculator. • Minor updates of Voltage Divider Calculator. 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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Availability 75 of 75 storefronts

Region	Language	Price	Ratings	Avg	Version
US	en-US	Free	427	4.8	26.07
MX	es-MX	Free	109	4.9	26.07
BR	pt-BR	Free	70	4.9	26.07
CL	es-MX	Free	18	4.9	26.07
CO	es-MX	Free	16	4.6	26.07
EC	es-MX	Free	12	5.0	26.07
AR	es-MX	Free	9	4.9	26.07
GT	es-MX	Free	8	4.6	26.07
VE	es-MX	Free	8	5.0	26.07
PE	es-MX	Free	7	4.9	26.07
UY	en-GB	Free	7	4.9	26.07
CR	es-MX	Free	6	5.0	26.07
HN	es-MX	Free	6	5.0	26.07
DZ	en-GB	Free	5	5.0	26.07
DO	es-MX	Free	4	4.8	26.07
PA	es-MX	Free	3	5.0	26.07
SV	es-MX	Free	3	5.0	26.07
AO	en-GB	Free	2	4.5	26.07
GH	en-GB	Free	2	5.0	26.07
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PY	es-MX	Free	2	5.0	26.07
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BO	es-MX	Free	1	4.0	26.07
CD	en-GB	Free	1	5.0	26.07
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MW	en-GB	Free	1	5.0	26.07
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VG	en-GB	Free	0	—	26.07
ZM	en-GB	Free	0	—	26.07

Reviews 30 reviews · US

★★★★★

Great App

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

K bike2026-05-28

★★★★★ · edited

Great app

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

84ChevyZ712026-05-18

★★★★★ · edited

Absolute fantstic!!!!!

One of the best in his kind!!!!!

Mcanabal2026-04-28

★★★★★

Simple to use and very handy

Has everything a hobbiest needs, including some basic circuit examples

Ancient_Traveler2026-04-15

★★★★★ · edited

Супер

Нравится

SevoshTM2026-03-11

★★★★★

The most useful tool you can have for electronic projects.

This app has saved me so much headache. I cannot overstate how thankful I am that this app has been developed. Download it, you won’t regret it!

Cqjquisty2026-03-01

★★★★★

Almost at a loss for words

Before I downloaded this app I already knew this was gonna be good by the obvious effort the developer puts into this by taking the time to respond to everything, this is almost priceless for anyone in this field, it’s dang sure selfless from the person that made it. Thanks.

Nickname nickname dirty Dave2026-02-23

★★★★★

Simply Marvelous!!!

Amazing collection of tools, pin outs, data sheets search and others source with exactly images how look like the components, great job!!! Fully recommend!!!

Saiyaman452026-01-22

★★★★★

Great App

Quite useful application all around. I only noticed an issue with some labels hard to read on MacOSX 26.2 system dark theme. Hopefully this can be addressed during next update.

oxoocoffee2026-01-02

★★★★★

Perfect

Great app for anyone looking to learn

Jeff Ruth2025-11-25

★★★★★

Rip

Quick and easy, my go to info source.

Riptool602025-10-25

★★★★★

Does what it says

No complaints here…

ThisMakesMeLooney2025-09-22

★★★★★

LC Reactance

Great little calculator. Helped a lot. Thanks!

iKristy492025-07-10

★★★★★

Good app

Very cool app

mohamed msw2025-04-02

★★★★★ · edited

It has everything

I mean it really has everything you need. Go pro, you won’t regret it

HunterG2025-03-19

★★★★★

Yes Now!!!

You have Cut Our R&D By At Least 75%…. Quick, very user friendly, gives Us complete reference profiles for rapid theoretical testing ~ This is now one of Our main go to’s for Active Crossover testing…. Truly Educational & Untolly AMLG Ltd., truly appreciate it ~ Thank You ~~~

KLAPP_32025-03-15

★★★★★

This App blows my mind. So much electronics info for free!

So many useful features in this free app it’s actually quite amazing. It has Ohms law calculator, RLC circuit calculator, reactance calculator, resistor/inductor/capacitor marking and color code identifiers, voltage regulator calculators, PWB trace thickness calculator, popular development boards such as the raspi and flipper PWB component layouts and pin outs, and the list just keeps on going. It seems like every time I click into this app I find a new feature that I didn’t know was available previously. This app will definitely help everyone from a novice to expert in some way or another. I

The EE SME2025-03-09

★★★★★

best tool in the box

i have used this app for a long time and am still amazed at how helpful it has been

itchynscratchy2025-01-31

★★★★★

Mind blown

Fantasticola35462024-11-25

★★★★★

Amazing

The one and only application for any electronic engineer

Moerandy2024-11-11

★★★★★

Bill F

Really nice app to use, saves time not having to look for a reference manual!

Bfrager2024-10-17

★★★★★

Great

Tanx

yvafaie2024-10-02

★★★★★

Electronic information and pin outs ect

Excellent program the information is neon that I thought could be made so readily available and accessible

victorj95422024-09-01

★★★★★

Thanks for the tool

This is a amazing tool for the people that are interested on learning electronic

kca11232024-08-08

★★★★★ · edited

Great Reference Resource

Love this app! Great job!

TheRonJon2024-08-06

★★★★★

good

i can pay for it

willson23442024-07-28

★★★★★

Amazing

This app is very well done and I plan to use this frequently. Thank you for such love put into this. I always look forward to the updates:)

Gordbasher2024-07-24

★★★★★

Lots of Russian words and spelling

Unless you’re Russian, this app will be very limited in helping you out. Lots of Russian words and sentences and symbols. Not USA frendly.

ssreny2024-05-31

★★★★★

Great app

Much needed app to add to my electronic hobby

Thangdangler1012024-05-19

★★★★★

Top notch application

Thanks for the recent updates and additions. With Kindest Regards-BR

Sherap62024-04-22

Change log 29 changes · US

✎

releaseNotes updated

- Ideal transformer calculator. Finds unknown winding turns, voltages and currents from the turns ratio, or the winding currents from the rated power. - [PRO] T

2026-07-09

✎

description updated

Digital toolbox for electronics engineers and electricians. Calculators and references for beginners and professionals — for work, study, DIY, and repair. Used

2026-07-09

✎

subtitle updated

Calculators and references

2026-07-09

✎

name updated

Electronics Engineer Helper

2026-07-09

◆

Version 26.07 released

2026-06-22

◆

Version 26.06 released

2026-05-25

◆

Version 26.05.2 released

2026-04-29

◆

Version 26.05 released

2026-04-27

◆

Version 26.04 released

2026-03-30

◆

Version 26.03 released

2026-03-11

◆

Version 26.02 released

2026-02-17

◆

Version 26.01 released

2026-01-26

◆

Version 25.12 released

2025-12-31

◆

Version 25.11 released

2025-11-19

◆

Version 25.10 released

2025-10-10

◆

Version 25.08 released

2025-08-24

◆

Version 25.07 released

2025-07-04

◆

Version 25.05 released

2025-05-01

◆

Version 25.02 released

2025-02-16

◆

Version 25.01 released

2025-01-13

◆

Version 24.12 released

2024-12-17

◆

Version 24.11.3 released

2024-11-27

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Version 24.11.2 released

2024-11-10

◆

Version 24.11 released

2024-11-10

◆

Version 24.10.2 released

2024-10-06

◆

Version 24.10 released

2024-10-01

◆

Version 24.09 released

2024-09-15

◆

Version 24.06 released

2024-06-19

◆

Version 24.04 released

2024-04-21