Comparison

iCircuit vs 2017 Master Electrician Ref.

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

iCircuit

Design and simulate analog and digital electronic circuits in real-time. This app offers a comprehensive component library, built-in test equipment, and the ability to create custom elements. It's ideal for learning, prototyping, and validating designs without physical components.

Highlights
  • Real-time circuit simulation
  • Extensive component library (300+)
  • Built-in test equipment (multimeter, oscilloscope)
  • Programmable Arduino and PIC microcontroller support
  • Custom element creation and sharing
  • Audio simulation
Features
Read full description

iCircuit is the premier iPhone and iPad app for designing, simulating, and learning analog and digital electronics. Its advanced simulation engine provides real-time, always-on analysis so your circuits stay powered and live, just like working with real components. Use it like a CAD tool: add components, wire them up, and set their properties. But iCircuit is unlike typical CAD apps because it is always simulating. You do not stop to take a measurement or spend time configuring reports. Instead, you just play with the circuit as you normally would, with the power on. Build circuits with over 300 components, from simple resistors and LEDs to programmable Arduinos (Uno, Nano, Mega, ESP8266, ESP32), PIC microcontrollers, and 60 4000/7400-series digital ICs (more available with Pro). Connect elements, adjust values, and instantly see the results. BUILT-IN TEST EQUIPMENT • Multimeter: Probe any point to read voltage, current, and power • Oscilloscope: Track multiple signals with touch-controlled time scale, stacked/unstacked views, FFT analysis, and Bode plots • Gauges: Visualize voltages, currents, and frequencies directly in your circuit • Signal generators and configurable sources EXTENSIVE COMPONENT LIBRARY • Programmable Arduinos (Uno, Nano, Mega, ESP8266, ESP32) • Programmable PIC microcontrollers (assembly and HEX files, more available with Pro) • Power: Voltage regulators (78xx, LM317), sources, dependent sources, power jacks, and simulated antennas • Analog: Resistors, capacitors, inductors, diodes, BJTs, MOSFETs, thermistors, triodes, and tetrodes • Digital: Logic gates (AND, OR, NAND, NOR, XOR), JK and D flip-flops, and 60 4000/7400-series ICs (180+ available with Pro) • ADCs and DACs • Sensors and displays: LEDs, 7-segment, NeoPixels, matrix displays, thermistors • Electromechanical: Motors, servos, SPST/SPDT and DPST/DPDT switches, push buttons, relays, and speakers CREATE CUSTOM ELEMENTS Build sub-circuits and custom elements to componentize your designs and create reusable modules. Share your custom elements with others via the iCircuit Gallery. AUDIO SIMULATION Hear your circuits. Speakers, buzzers, and microphones produce real audio output. Perfect for students learning electronics, hobbyists prototyping projects, and engineers validating designs, all without burning out a single component. ABOUT ICIRCUIT PRO (OPTIONAL) iCircuit is a complete app with a one-time purchase. iCircuit Pro is optional and adds extra components (including more PICs and a larger 4000/7400 IC library) and helps fund ongoing development. Pro is not required for core simulation or everyday circuit design. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

2017 Master Electrician Ref.

This digital handbook provides electricians and related professionals with essential electrical formulas, diagrams, and reference tables. It offers calculations, a dictionary of terms, and detailed information on wiring, motors, transformers, and more, all accessible on a mobile device.

Highlights
  • Electrical formulas and calculations
  • Wiring diagrams for various systems
  • Motor and transformer specifications
  • Conductor and ampacity tables
  • Dictionary of electrician terms
  • NEMA standards and diagrams
  • Math and conversion tools
Features
Currently charting
Read full description

Master Electrician Reference (or MER for short) 2017 is your electronic pocket electrician reference guide. MER is for electrical designers, engineers, installers, contractors, facility managers, inspectors, exam candidates, apprentices, electricians, journeymen, architects, and technicians. MER is for people doing residential, industrial, and commercial work. Simply, if you are a Master Sparky or work with electricity in any way, this reference guide is for you! Have you ever lost pages or had damaged pages in your pocket electricians reference? The solution is here: Use MER to keep the most important information easily accessible on your iPhone, iPod Touch, or iPad. MER will even do calculations for you; something your old pocket reference book can't do. MER is divided into the following sections: * Simple Circuits - Ohm's law, series and parallel circuits, capacitance, inductance, impedance, and reactance. * Distributed Systems - Distribution wiring diagrams for 120, 208, 277, and 480 volts, color codes, breaker sizes, light switches and bells diagrams. * Electrical Formulas - Formulas for kVA, kW, and HP. * Color Codes - Color codes for capacitors and resistors. * Motors and Wiring - Standard motor and motor starter sizes, tables of full-load currents, locked-rotor information, overload units, OCPD, nameplate information, synchronous motor speeds, three-phase STAR and DELTA diagrams, three-wire start-stop diagram, motor frame dimensions, and motor enclosure types. * Transformers - KVA ratings for single- and three-phase current, transformer formulas. * Conductor Properties - Conductor tables, AWG and metric wire sizes, twist-on pressure connectors, and wire combinations. * Ampacities - Ampacities in raceway, cable, earth, and free air, and derating tables. * Conduit Fill table * Grounding Sizes - Equipment grounding conductor (EGC) and grounding electrode conductor (GEC). * Metal Boxes - Images and sizes of metal boxes, junction / device boxes, junction / pull boxes. * Voltage Drop calculations * Dictionary of electrician terms * Insulation Charts - Table of cable and wire types * Electrical Symbols * NEMA - Plugs and wiring diagrams, enclosure types, standard underground boxes, standard fuse and breaker sizes, standard pull box / junction sizes, standard gutter and wire-ways, standard switchboards, standard busway, standard busbar ampacity, standard panelboard sizes, and standard disconnect sizes. * Math and Conversions - Formulas for algebra, geometry, fractions, temperature conversion, trig tables, unit conversions, metric prefixes, and conversions between inches and millimeters. * Conduit Bending - Includes the guide "The Master Bender Way" on how to bend conduit. See the Master Bender app or MasterBender.com website for more information. * Conduit Weights * Copper Wire Cost * Hole Saw Sizes * Material Raceway Support * Lighting - Fluorescent, high-intensity discharge, incandescent, LED, and low-pressure sodium. * Standard Tool List * Torque - Lugs, bolts, and screws, tightening torque. * Dry, Damp, and Wet Locations * Hazardous Locations * Wiring Methods * Safety - Lock-out / tag-out (LOTO), and a safety manual and first aid. Most pages contain a general scientific calculator. It is expression based: Just enter an expression and evaluate it. It understands trig and power functions, can convert between radians and degrees, and has built-in basic constants like pi and e. MER includes key NEC tables from the National Electrical Code (NEC) 2017. We also have MER apps available for NEC 2011 and NEC 2014 code years. Visit our website at MasterSparky.com for more information.

Screenshots

iCircuit4 screens
2017 Master Electrician Ref.4 screens

Verdict

The call

The clearest difference is rating: 2017 Master Electrician Ref. at 4.7 against iCircuit's 3.8. 2017 Master Electrician Ref. also leads on in-app purchases (none vs 2) and price ($9.99 vs $12.99). iCircuit's advantage is update cadence (every 3 weeks vs every 5 months). On review sentiment, ads, monetization model and chart position there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

iCircuit costs $12.99 and 2017 Master Electrician Ref. $9.99 up front. iCircuit sells 2 in-app purchases, starting at $1.99 per month. 2017 Master Electrician Ref. asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

2017 Master Electrician Ref. holds the better App Store score, 4.7 against 3.8. That said, the two scores are not equally well evidenced: 2017 Master Electrician Ref. has 1.3K ratings behind it against 134, so its average is the more settled of the two. Written reviews point the same way: 61% of iCircuit's written reviews are positive against 67% of 2017 Master Electrician Ref.'s.

UpkeepUpdate frequency

iCircuit ships an update every 3 weeks, 2017 Master Electrician Ref. every 5 months. The most recent releases landed on September 24, 2026 and September 22, 2026 respectively.

Scorecard5 real differences · 6 level
iCircuit versus 2017 Master Electrician Ref.: the parameters behind the verdict, then further details
ParameteriCircuit2017 Master Electrician Ref.
Price$12.99$9.99 — better
Rating3.8 (134 ratings)4.7 (1.3K ratings) — better
Positive reviews61.1% of reviews66.7% of reviews — better
Number of ratings1341.3K — better
Update frequencyEvery 3 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
Best chart rank#142#62 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.212.0 — better
Further details — not scored
Size126 MB46 MB
Age rating4+12+
DeveloperKrueger Systems, Inc.PawEng, LLC

Customer experience

iCircuit

All ratings134 ratings
Positive67.9%
Neutral4.5%
Negative27.6%
Written reviews682 reviews
Positive61.1%
Neutral12.6%
Negative26.2%

2017 Master Electrician Ref.

All ratings1,255 ratings
Positive92.7%
Neutral3.4%
Negative3.9%
Written reviews24 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

User reviews

iCircuit

From 134 App Store ratings

What we love

  • 🚀 Great for learning and testing
  • 👍 Intuitive and easy to use
  • 💡 Programmable Arduino integration
  • 👍 Useful for hobbyists and students

Room to improve

  • 🐛 Buggy and crashes frequently
  • 🔧 Difficult to edit and delete components
  • 🔧 Limited component library
  • 🔧 Inaccurate simulation results in some cases

2017 Master Electrician Ref.

From 1.3K App Store ratings

What we love

  • 👍 Quick reference
  • 🚀 Best app for electrical information
  • 🚀 Concise and well-laid out information
  • 🚀 Comprehensive electrical references

Room to improve

  • 🐛 App needs to be updated
  • 🐛 Inaccurate information in some areas
  • 🐛 Limited functionality compared to expectations
  • 🐛 Overlapping table of contents

Bugs and requests

iCircuit

Reported bugs

4 issues
  • Oscilloscope and meter functions not working properly
  • Saving and loading circuits can be unreliable
  • Inconsistent behavior when rotating/flipping components
  • Crashes when working with larger or more complex circuits

Requested features

5 requests
  • More components (e.g. transformers, triodes, MOSFETs)
  • Ability to create custom components
  • Frequency domain analysis (Bode plots, FFT)
  • Improved wiring and component placement controls
  • Better support for AC circuits and motors

2017 Master Electrician Ref.

Reported bugs

3 issues
  • Conduit fill information missing for certain types
  • Login screen freezes
  • Compatibility issues with older devices

Requested features

3 requests
  • Update to latest NEC code
  • Add calculation tools for conduit fill and voltage drop
  • Improve user interface and navigation

In-app purchases

2 purchases

iCircuit

Subscriptions2
  • iCircuit Pro (Monthly)$1.991 Month
  • iCircuit Pro (Yearly)$14.991 Year
None

2017 Master Electrician Ref.

No in-app purchases

Questions

Is iCircuit free?
iCircuit costs $12.99, and also offers in-app purchases.
Is 2017 Master Electrician Ref. free?
2017 Master Electrician Ref. costs $9.99, with no in-app purchases.
Which has better reviews, iCircuit or 2017 Master Electrician Ref.?
2017 Master Electrician Ref. is rated higher. iCircuit averages 3.8 out of 5 from 134 ratings, while 2017 Master Electrician Ref. averages 4.7 from 1.3K ratings.
Do iCircuit or 2017 Master Electrician Ref. have ads?
Neither iCircuit nor 2017 Master Electrician Ref. shows ads.
Which is updated more often, iCircuit or 2017 Master Electrician Ref.?
iCircuit ships an update every 3 weeks, and 2017 Master Electrician Ref. every 5 months. Most recently, iCircuit was updated on September 24, 2026 and 2017 Master Electrician Ref. on September 22, 2026.
Which is more popular, iCircuit or 2017 Master Electrician Ref.?
iCircuit currently peaks at #142 in the App Store charts, and 2017 Master Electrician Ref. at #62. Chart position reflects recent download velocity rather than total install base.

Other comparisons