# Sparky's Black Book > Offline electrical code calculators and field tools for electricians. (iPhone/iPad app by Chris Snider.) - Source: https://appshunter.io/ios/app/sparkys-black-book/id6770407622 (this page in markdown: same URL + `.md`) - Developer: [Chris Snider](https://appshunter.io/developer/1830863973) - Category: Utilities - Price: Free - Rating: 5.00/5 from 2 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 18.0 · 15 MB - Languages: English - Released: 2026-05-20 - Data updated: 2026-06-25 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/sparkys-black-book/id6770407622/reviews.md ## What is 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. ## Key features - 58+ NEC-grounded calculators - Offline functionality - Pass/fail compliance flags - Automatic component sizing - Conduit bending math - Torque specs - Built-in level, compass, flashlight ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/sparkys-black-book/id6770407622/reviews.md ### 5/5 — Better then Ugly’s *2026-06-13* This app saves me lots of time not having to search through pages of the NEC and the Ugly’s. ### 5/5 — Amazing App *2026-06-02* This is a amazing app for all electricians. I love this is better than other reference books you use to carry in your pocket. ### 5/5 — Amazing App *2026-05-21* This is a amazing app for all electricians. I love this is better than other reference books you use to carry in your pocket. ## Frequently asked questions about Sparky's Black Book ### What is Sparky's Black Book? Sparky'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. ### Does Sparky's Black Book work offline? Yes, Sparky's Black Book is 100% on-device and functions completely offline, making it reliable in areas with no network connectivity. ### What NEC tables does Sparky's Black Book use? 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. ### What are the free features in Sparky's Black Book? 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. ### What does Sparky Pro offer? 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. ### How much does Sparky Pro cost? Sparky Pro is available as an auto-renewable subscription, with options for $4.99 per month or $29.99 per year. ### How do I manage or cancel my Sparky Pro subscription? 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. ### What is the age rating for Sparky's Black Book? Sparky's Black Book has an age rating of 4+, making it suitable for a wide range of users. ## Version history (last 2 releases) ### 1.0.4 — 2026-06-03 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. ### 1.0.3 — 2026-05-23 Major NEC accuracy pass: 240.4(D) small-conductor rule (12 AWG Cu capped at 20 A), 110.14(C) terminal temp picker (60/75/90 deg C), 310.15(C)(1) bundling derate, 250.122(B) EGC upsize when conductors are upsized for voltage drop, and 240.4(B) next-standard-size-up rule for OCPD. New Day/Night/System theme with system follow. Motor calculators correctly apply the 240.4(G) exception. ## More apps by Chris Snider - [AmpVault](https://appshunter.io/ios/app/ampvault/id6751367558) - [Clarifee Car Purchases](https://appshunter.io/ios/app/clarifee-car-purchases/id6755076776) - [WorkForce Shield](https://appshunter.io/ios/app/workforce-shield/id6764114515) - [BadgeLine](https://appshunter.io/ios/app/badgeline/id6766971553) - [SnidStamp](https://appshunter.io/ios/app/snidstamp/id6767884236) - [Cutout: BG Remover AI](https://appshunter.io/ios/app/cutout-bg-remover-ai/id6770151102) All apps by Chris Snider: https://appshunter.io/developer/1830863973 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-25.*