Built by a working IBEW Electrician

THE CODE
IN YOUR
POCKET.

AI-powered code assistance, photo compliance scanning, and precision electrical calculators — built for the field, not the office.

⚡ Download Free See Features →
10+
// Pro Calculators
iOS
// & Android
FREE
// To Start
// Core Features

EVERYTHING
YOU NEED

Two AI engines, a full reference library, and calculators built with fractional inch precision — the way electricians actually work.

🤖
SparkyCode AI Assistant
Ask any electrical code question in plain English and get a clear, reliable answer in seconds. No browser, no codebook, no digging through articles on your lunch break.
AI · Code Assistant
📸
SparkCheck Photo Scanner
Point your phone at any installation and let SparkCheck analyze it. Get a breakdown of potential issues, severity ratings, and recommended fixes — right on the spot.
Photo AI · Compliance
📐
Precision Calculators
Conduit bending, voltage drop, box fill, breaker sizing, 3-phase power, transformer calculations — all built with fractional inch precision because decimals don't work in the field.
10+ Calculators
📚
Reference Library
Wire ampacity tables, conduit fill, grounding specs, motor data, torque specs, conduit sizing, support spacing, Cat 6 wiring, business resources — all offline-capable.
Offline · Field-Ready
🔒
Secure & Private
All AI processing runs through secure Firebase Cloud Functions. No API keys in the app. Your data stays yours — full account deletion available anytime in Settings.
Firebase · Cloud Functions
// Calculators & Reference

BUILT FOR
THE FIELD

Every calculator built the way electricians think — fractional measurements, real-world defaults, results you can use immediately in the field.

Conduit Bending
Voltage Drop
Box Fill
Ohm's Law
Breaker Sizing
3-Phase Power
Transformer Calc
Wire Ampacity
Conduit Fill Tables
Conduit Sizing & OD
Motor Data (FLC/LRA)
Wire Torque Specs
Bolt Torque Specs
Grounding (GEC/EGC)
Support Spacing
Cat 6 Wiring (T568A/B)
Electrical Formulas
// Pricing

START FREE.
UPGRADE WHEN
YOU'RE READY.

Every electrician gets free access. Upgrade when you need more daily AI queries and photo scans.

Apprentice
$0/mo
2 AI scans / day
  • SparkyCode AI Assistant
  • SparkCheck Photo Scanner
  • All Calculators
  • Full Reference Library
  • 2 scans per day
Get Started Free
Journeyman
$3.99/mo
15 AI scans / day · $34.99/yr
  • Everything in Apprentice
  • 15 scans per day
  • Annual plan saves 27%
  • Priority AI responses
Download App
MOST POPULAR
Foreman
$8.99/mo
50 AI scans / day · $79.99/yr
  • Everything in Journeyman
  • 50 scans per day
  • Annual plan saves 26%
  • Best for crew leads
Download App
Owner
$29.99/mo
200 AI scans / day · $269.99/yr
  • Everything in Foreman
  • 200 scans per day
  • Annual plan saves 25%
  • Built for contractors
Download App
ONE-TIME SCAN PACKS
Never expire. Perfect for occasional use or topping up.
STARTER
10 scans
$1.99
PLUS
50 scans
$4.99
PRO
150 scans
$9.99
MEGA
400 scans
$19.99
BUILT BY AN
ELECTRICIAN.
FOR ELECTRICIANS.

Master Electrician was built by a working IBEW electrician who got tired of pulling up a browser mid-job just to look up a code question or run a voltage drop calc.

Every calculator uses fractional inch precision because that's how we work. Every reference is field-tested. The AI assistant is extensively trained on electrical code so you get reliable answers fast.

This isn't built by a software company that hired an electrician as a consultant. It's built by someone who runs conduit every day.

🔌
IBEW Member — Working Electrician
📖
Comprehensive Electrical Code Knowledge
📐
Fractional Precision Throughout
🏗️
Built for Commercial & Residential
What electricians use it for
⚡
Quick code questions in the field
Get a clear answer without leaving the job site or calling the office.
📸
Scan a rough-in before inspection
Catch potential issues before the inspector does.
📐
Run calculations on the spot
Voltage drop, box fill, breaker sizing — in seconds, in fractions.

CODE REFERENCE LIBRARY

Free, in-depth guides written by a working IBEW electrician. Start with the 2023 NEC code changes — expanded GFCI requirements, emergency disconnects and surge protection, broken down article by article. Working ahead? The 2026 NEC code changes guide ranks every revision by real-world impact. For the long view, see how the code has shifted across editions in our NEC edition-by-edition change history.

On the tools side: how to calculate voltage drop with worked examples, a conduit bending cheat sheet for offsets, saddles and kicks, the 10 most common code violations inspectors write up, arc flash safety under NFPA 70E, and journeyman exam prep with 20 practice questions. Browse all articles →

GET THE
APP.
IT'S FREE.

Start with 2 free AI scans per day. Upgrade when you need more. Available on iOS and Android.

Download on the App Store
Get it on Google Play

From the blog

Code changes, worked calculations and field tips. All 26 articles or start with the calculator guides.

NEC Updates

NEC Adoption by State: Which Code Edition Your Jurisdiction Enforces

Which NEC edition each state enforces in 2026, why adoption lags publication, and how to confirm the code your AHJ will actually inspect you against.

Read it →
Calculators

Box Fill: How to Size a Box Correctly Under NEC 314.16

How to calculate box fill under NEC 314.16: what counts, what does not, the volume allowances per conductor size, and two fully worked examples.

Read it →
Calculators

Wire Size Chart: Conductor Ampacity Under NEC 310.16

Copper and aluminum ampacity by conductor size and temperature column, plus the termination rule, correction factors and adjustment that change the answer.

Read it →

Frequently asked questions

Is the Master Electrician App free?
Yes. The Apprentice tier is free and includes 2 AI scans per day, all 17 calculators, and the full reference library. Paid tiers add more daily scans and nothing else.
What electrical codes does the app cover?
The code assistant is trained on the 2017, 2020 and 2023 editions of the National Electrical Code, which covers what the large majority of US jurisdictions enforce today. The 2026 edition was published in October 2025 but only a small number of states have adopted it so far. Always confirm the adopted edition with your AHJ before relying on any reference.
Does the app include the full NEC code text?
No, and be careful of any app that claims to. NFPA holds the copyright to the National Electrical Code and licenses it narrowly. This app provides guidance, explanations, calculators and reference tables. For the official text, use the printed code book or NFPA's own read-only access.
Is the app available on both iOS and Android?
Yes, on both the Apple App Store and Google Play.
Do the calculators work offline?
Yes. All 17 calculators and the reference library work without a connection, which matters in basements, mechanical rooms and steel buildings.
// Free Download

GET THE FIELD PACK

Two printables: the 22-point rough-in checklist, and branded panel schedules in 24, 30 and 42 circuit that print at 4 by 5 inches and slide straight into a panel sleeve. Enter your email and the downloads open right away.

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// DisclaimerThe National Electrical Code® (NEC®) and NFPA 70® are registered trademarks and copyrighted publications of the National Fire Protection Association (NFPA). This article is an independent educational resource and is not affiliated with, endorsed by, or sponsored by the NFPA. All code references in this article are paraphrased for educational purposes only and do not reproduce the official text of any NEC edition. This content is not a substitute for the official NFPA 70 publication. Electricians, contractors, and students are encouraged to purchase the official National Electrical Code from the NFPA at nfpa.org for complete and authoritative code text. Always verify requirements with the code edition adopted by your jurisdiction and your Authority Having Jurisdiction (AHJ).