This app provides over 58 NEC-grounded calculators for electrical work, functioning entirely offline. It offers real-time compliance flags and automatically sizes up components when out of spec. Additional field tools are available through an optional subscription.
1.0.4
June 3, 2026
Introducing Sparky Pro — unlock Field Lab (nameplate OCR, AR tape measure, Voice Calc), Job Pack PDF export, BOM Builder, and GPS time tracking. All 58+ calculators and the NEC reference tables remain free. Plus stability and accuracy improvements.
MoreSparky's Black Book is an offline utility app offering over 58 electrical code calculators grounded in the NEC. It provides real-time compliance flags and automatically suggests compliant component sizes.
Yes, Sparky's Black Book is 100% on-device and functions completely offline, making it reliable in areas with no network connectivity.
Sparky's Black Book uses actual NEC tables for calculations, including 310.16 and 310.17 for ampacity, Chapter 9 Tables for conduit fill, and 314.16 for box fill.
The free version includes all calculators, conduit bending, torque specs, Black Book reference tables, OSHA safety references, and built-in tools like a level, compass, and flashlight.
Sparky Pro unlocks advanced field tools such as a motor nameplate OCR scanner, AR tape measure, Voice Calc, Job Pack Generator for PDF reports, BOM Builder, and GPS-tagged time logging.
Sparky Pro is available as an auto-renewable subscription, with options for $4.99 per month or $29.99 per year.
You can manage or cancel your subscription within your Apple Account settings after purchase. The subscription renews automatically unless canceled at least 24 hours before the current period ends.
Sparky's Black Book has an age rating of 4+, making it suitable for a wide range of users.
