Sparky's Black Book

Every number you calculate in the field is either code or it isn't. Sparky's Black Book gives you 58+ NEC-grounded calculators that run completely offline — in the basement, the MDF room, the rooftop, wherever the job takes you.

THE NEC, NOT AN APPROXIMATION

Sparky's Black Book uses the actual tables. 310.16 and 310.17 for ampacity. 430.247, 430.248, and 430.250 for motor branch circuits. Chapter 9 Tables 1, 4, 5, and 8 for conduit fill. 314.16 for box fill. 250.66 and 250.122 for grounding electrode and equipment grounding conductors. Real values from the code — not estimates from memory or a third-party website.

Every result comes back with a pass/fail compliance flag. If your selection is out of spec, the app automatically sizes up to the next compliant conductor, conduit, or device. You see the answer and you see why.

58+ CALCULATORS FOR THE WORK YOU DO

Voltage drop, conduit and box fill, motor branch circuit sizing, service and feeder load calculations (NEC 220), grounding electrode conductors, equipment grounding, and bending math. Enter what you know. Get the answer. Move on.

WORKS WHERE YOU WORK

No network. No account. No cloud dependency. Sparky's Black Book is 100% on-device. It runs the same in a basement with zero bars as it does in your truck.

FREE TO USE

The calculators, conduit bending, torque specs, the Black Book reference tables, OSHA safety reference, and the built-in level, compass, and flashlight are all free.

SPARKY PRO

Upgrade to Sparky Pro to unlock the heavy-duty field tools:
- Field Lab: motor nameplate OCR scanner, AR tape measure, and Voice Calc
- Job Pack Generator: compile calcs, photos, and docs to a shareable PDF
- BOM Builder: materials, quantities, and pricing with save and export
- Time & Notes: GPS-tagged clock in and out logging

Sparky Pro is an auto-renewable subscription:
- Monthly: $4.99 per month
- Yearly: $29.99 per year

Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription in your Apple Account settings after purchase.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.capitolsafetytechnologies.com/privacypolicy

BUILT FOR THE JOB SITE

The hi-vis fluorescent theme is readable in truck bays, crawlspaces, attics, and direct sunlight. Touch targets are sized for gloves. Every screen gets you to the calc you need in two taps or less.

If you're a journeyman, master electrician, or apprentice doing real commercial, industrial, or residential work, this is the calc tool you put on your phone and trust on every job.