eTools is a powerful virtual toolbox which combines a lot of useful reference materials with electronics tools (calculations, conversations, coding/decoding, etc) in one application in your iOS family devices. Professional or hobbyst can easy recive most of necessary informations or calculation results at some simple finger touches.

Resistor Color Code.
Chip-resistors (smd) decoding (3 digits, 4 digits, EIA-96).
Axial inductors colors decoding.
Capacitors decoding and voltage references for tantalum
Solenoid Calculator
Power calculator.
Ohm's Law.
Reactance (XC for capacitance and XL for inductance).
Resistors voltage divider, ideal and with load. Variable resistor emulation. ("E24 rounded" integrated).
Parallel resistors ("E24 rounded" integrated).
Capacitor charging calc.
Y-∆ conversion
Resistor for LED(s) (with most popular presets).
Operational amplifiers: non-inverted and inverted ("E24 rounded" integrated).
Zener Voltage Regulator
Compute LM317 voltage mode (with variable resistor emulator ("E24 rounded" integrated) & current mode.
Compute 555-timer: astable mode with ratio 50%-100% and astable mode with ratio 0-100%, monostable mode
Capacitor filter
Wire voltage drop calculator.
Frequency converter for radio waves and sound waves
DAC/ADC converter.
Decibels converter.
Bin-Oct-Dec-Hex converter.
Direct visibility radio communication
USB 1.x/2.0 & USB 3.0 pinouts and specifications.
FireWire 4, 6, 9-pins.
RS232 (DB9 & DB25 & IDC10).
Parallel (LPT port) / Centronics.
Ethernet (RJ-45) direct & crossover connections.
Parallel ATA (PATA/EIDE interface).
Serial ATA (SATA/eSATA).
AT-keyboard & PS-2 keyboard/mouse.
ATX-power (20/24-pins) & auxilary connectors.
Molex & fan connectors.
SATA power.
DisplayPort & MiniDisplayPort.
VGA (standart & VESA modes).
RCA (with typical color marking).
Professional Jack (6.3mm) & MiniJack (3.5mm) - 2, 3, 4 poles.
XLR/Cannon (3, 5-pins).
MIDI /MIDI Gameport
PS-x AV multiout.
xBox360 AV.
iPod 30pin connector
Enhanced mini-USB (EMU)
Raspberry Pi
Cubieboard 1/2
STMDiscovery ST-Link SWD
SI system.
Symbols & abbreviations.
Electrical conductivity.
AWG & SWG wires.
Maximum current for copper assembly wires.
ASCII codes.
Basic logic gates.
7400 family (while only a list of family with functions and decoding).
78xx/79xx family (basic data, scheme, packages).
Interactive 7-segment display.
Bipolar transistors (nearly 50000 pcs) catalog & select.
FETS (JFET & MOSFET) (nearly 5000 pcs) catalog & select.
IGBT transistors (nearly 1000 pcs) catalog & select.
Microchip 8bit MCUs (PIC10F, PIC12F, PIC16F, PIC18F) catalog&select (with datasheets)
Atmel 8bit MCUs (90, Tiny, Mega, XMega) catalog&select (with datasheets)
Ferrite materials.
R (torroid)

What’s New

Version 2.12

Some bugs fixed

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

Visyan671 ,

Coolest APP!!

Helps me out so much... awesome developers

ElectEng ,

Great Electrical Reference App

Every page of this app is well thought out with it's design. The calculators make it easy to enter the information with diagrams showing the calculation. There are pinout diagrams of just about every connector you will run into today. The reference sections tie a lot of different information into a concise one-stop-shop for just about anything electrical or electronic.

What prompted this review? The developer's quick, polite response to a feature request and it being there in the next release.

agar7419 ,


This is an invaluable resource for electronics, electrical, and biomedical engineering students and professionals It's great as both a study tool as well as a quick lab / field reference. I started with the free app and loved it so much, I got the pro version and the added content was well worth the price. I wish it had a built in scientific / engineering calculator, formula quick reference, and periodic table. Would buy it again in a heartbeat.


Viacheslav Korniienko
153.9 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Russian, Ukrainian

Age Rating
Rated 4+
© Viacheslav Korniienko


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