Your Complete Electrical Field Companion
14 NEC calculators + standard calc · jurisdiction-aware NEC edition by city/ZIP · hands-off voice assistant · photo analysis · full invoicing · 23 wiring diagrams · NEMA configs · transformer wiring · NEC code changes · blueprint symbols · favorites · job reminders — all in one app.
$9.99
One-time purchase · No subscription · No ads · Offline ready*
Hands-Off Voice Mode
Gloved hands, crawl space, panel work — tap once and Coop listens automatically. Ask your question out loud. Get the answer read back to you. It loops back and listens again. No typing. No screen touching. Choose a male or female voice. Requires internet connection.
① Tap once to start
② Ask out loud
③ Hear the answer
④ Auto-repeats
What Sets This App Apart
Tools that go beyond any printed pocket reference
🎙 Hands-Off Voice AssistantFull voice conversation while your hands are busy. Auto-looping — Coop listens, answers aloud, and listens again. Choose male or female voice. Works in crawl spaces, on ladders, at panels. Requires internet.
📸 Photo AnalysisPoint your camera at a motor nameplate, panel schedule, or breaker label. Coop reads it and tells you exactly what you need — wire size, overload rating, OCPD. Requires internet.
🧮 14 NEC Calculators + Standard CalcVoltage drop, wire size, conduit fill, box fill, motor FLA, locked-rotor current, transformer sizing, short circuit, ampacity adjustment, and more — all offline, all NEC 2023. Plus a full arithmetic calculator.
📍 Jurisdiction-Aware NEC EditionA persistent banner on the calculator home screen shows your municipality and ZIP, and the NEC edition your AHJ enforces (2008, 2014, 2017, 2020, or 2023, depending on jurisdiction), plus any scheduled upcoming adoption (e.g. “Updates to NEC 2023 in Sep ’25”). Set it by GPS, ZIP, or state picker. City overrides cover NYC and Chicago today. When online, the app silently checks for newer adoption dates so you’re always aware of what your inspector will enforce. Your jurisdiction is also passed to the Coop Assistant so its answers stay relevant to your AHJ.
📐 23 Interactive Wiring DiagramsSwitches, GFCI, AFCI, 3-way, 4-way, EV chargers, hot tubs, service entrance, MWBC, ceiling fans, and more. With NEC article references built in. All offline.
📖 Complete NEC Reference LibraryAmpacity tables, NEMA wiring configurations, transformer connection diagrams, blueprint/electrical symbols, NEC 2020→2023 code changes, GFCI/AFCI requirements, burial depths, grounding electrode sizing, and more. All offline.
🧾 Full Invoicing Suite12 trade-specific invoice templates, PDF generation, tax rate lookup by zip code, client database. Create and send professional invoices from the job site.
🔔 Jobs & RemindersTrack jobs with notes, set push notification reminders for inspections, permits, callbacks. Bookmark your most-used calculators and references for quick access.
🌍 9 LanguagesEnglish, Spanish, French, Chinese, Tagalog, Hindi, Russian, Korean, Japanese. The entire app — calculators, references, and interface — works in your language.
🔦 Built for Real Field WorkDark mode for low-light conditions. Large touch targets for gloved hands. Backup and restore your data. Calculators, references, diagrams, and invoicing all work with no signal.
💾 Backup & RestoreExport all your jobs, invoices, notes, favorites, and settings to a single file. Restore on any device. Your data is yours — always.
One app. Everything you need in the field.
Calculators · Voice Assistant · Wiring Diagrams · NEC References · Invoicing · Reminders · 9 Languages · Offline Ready*
$9.99 — buy once, own it forever
No subscription. No ads. No account required.
*Offline ready — all calculators, reference tables, wiring diagrams, invoicing, and job management work without internet. The Coop Assistant (voice mode, photo analysis, and chat) and tax rate lookup require an internet connection.