The whole job, in your pocket.
Calculators, code reference, per-state rules, job logging with photos, client estimates, compliance checklists, troubleshooting, and an AI code assistant — purpose-built for solo electricians and small operators.
Free · Android 8.0+ (APK, 12 MB) · iPhone version coming to the App Store
Everything an electrician needs
Generic field-service apps are bloated and expensive. This one is fast, focused, and works offline in the field.
10 Code Calculators
Ohm's law, voltage drop, wire size with derating, conduit & box fill, conduit bending, motor, OCPD, transformer, and dwelling load — all offline.
NEC Reference
Table 310.16 ampacities, conductor properties, conduit areas, grounding (250.66 / 250.122), color codes, NEMA configs, and residential circuits.
Per-State Rules
The adopted NEC edition, licensing authority, and license tiers for all 50 states + DC — with the career path from apprentice to master.
Job Logging & Photos
Log every job with client info and status, and document work with before / during / after photos straight from your phone's camera.
Client Estimates
Build professional line-item estimates (labor, materials, permits), apply tax, and share a clean summary with your client in seconds.
Compliance Checklists
Inspection-ready checklists for service, rough-in, final, grounding & bonding, GFCI/AFCI (2023), safety/LOTO, and panel installs — each with NEC references.
Troubleshooting
Diagnose 14 common field problems — tripping breakers, dead outlets, flicker, shocks — with ranked causes and safe diagnostic steps.
AI Code Assistant
Ask anything electrical and get code-aware answers that cite NEC sections — powered by Cloudflare Workers AI.
Get it on Android
Free, no account required. Download the app and install it directly on your phone.
- Tap Download APK above on your Android phone.
- Open the downloaded
master-electrician-guide-1.0.apkfile. - If prompted, allow your browser/Files app to install unknown apps (Android shows this once for sideloaded apps — it's normal for apps installed outside the Play Store).
- Tap Install, then open Master Electrician Guide.
Requires Android 8.0 or later. The iPhone version is coming to the App Store.
Built by the trade, for the trade
A field aid — not a substitute for the adopted code, local amendments, or a licensed design. Always verify against your AHJ and adopted NEC edition, and follow NFPA 70E safety practices.