Comparison

Sparky vs VoltBook

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sparky

Features
Read full description

Sparky is the electrician field kit built for fast jobsite math, cleaner panel work, and inspection-ready documentation. Run the electrical calculations you reach for every day without digging through notes, spreadsheets, or half-remembered formulas. Sparky brings conduit bending, conduit fill, voltage drop, ampacity, breaker sizing, motor calculations, box fill, panel schedules, NEC reference notes, job notes, photo logs, and PDF reports into one focused mobile app. BUILT FOR ELECTRICIANS IN THE FIELD Sparky is designed for working electricians, apprentices, journeymen, foremen, contractors, maintenance techs, and electrical crews who need quick answers while the job is moving. Use Sparky for: • Conduit bend marks and bender setup • Offset bends, saddles, 90s, kicks, and multi-bend layouts • Conduit fill and conduit sizing • Voltage drop calculations • Wire ampacity and derating checks • Breaker sizing for continuous and non-continuous loads • Motor full-load amps, conductor sizing, OCPD, and overload values • Box fill calculations with conductors, devices, clamps, and grounds • Panel schedules, circuit loads, and phase balance • Job notes, local photo logs, and PDF exports • Searchable starter NEC reference content and citation chips CONDUIT TOOLS Select a bender, choose a bend type, enter the field measurements, and get live bend results. Sparky helps with common conduit work including offsets, saddles, stub-ups, kicks, segmented 90s, conduit fill, raceway sizing, and multiple-bend sequences. WIRE & LOAD CALCULATORS Calculate voltage drop, voltage at load, recommended wire size, ampacity, derating, breaker size, and motor values. Sparky gives you clear result cards with pass, warning, or fail states so important numbers are easy to scan. BOX FILL Check box fill quickly with conductor sizes, device count, internal clamps, equipment grounds, and cubic inch capacity. See remaining capacity and code-related context before the box becomes a problem. PANELS, JOBS & REPORTS Create panel schedules, add circuits, review connected load, check phase balance, attach panels to job files, add job notes, keep photo logs, and export PDF reports from the device. NEC REFERENCE WORKFLOW Sparky includes bundled starter NEC reference content for common calculator workflows. Result chips surface relevant code references so you can move from a calculation to context without losing your place. LOCAL-FIRST FIELD TOOL Core calculators, saved panels, job notes, photo references, and starter reference data work locally. Sparky is built for electrical rooms, basements, job trailers, and sites where signal is not guaranteed. ASO SEARCH TERMS IN REAL LANGUAGE Use Sparky as an electrician calculator, electrical calculator, conduit bender calculator, voltage drop calculator, ampacity calculator, breaker calculator, box fill calculator, wire sizing tool, panel schedule app, and field reference. WHY ELECTRICIANS USE SPARKY • Faster field calculations • Fewer repeated manual formulas • Cleaner panel documentation • Better inspection prep • One place for calculators, notes, photos, and reports • Designed for touch use on the jobsite • Light, dark, and system appearance modes IMPORTANT NOTE Sparky is a professional field aid, not a substitute for licensed electrical judgment, official code books, manufacturer documentation, engineered plans, local authority requirements, or inspection direction. Always verify calculations, code references, installation conditions, and equipment ratings before performing electrical work. SUBSCRIPTION Sparky Pro unlocks the full field toolkit. Pricing, free trial availability, renewal terms, and cancellation options are shown by Apple before purchase. Subscriptions renew automatically unless canceled in App Store account settings. Terms: https://socialreporthq.com/sparky/terms Privacy: https://socialreporthq.com/sparky/privacy

About

VoltBook

This app provides electricians with a comprehensive digital toolbox, featuring numerous electrical calculators, searchable code references, and job documentation tools. It offers offline functionality for all calculators and tables, with AI assistance for calculations and field notes.

Highlights
  • 75+ electrical calculators
  • Searchable NEC code references (2020, 2023, 2026)
  • Offline functionality
  • AI Assistant for calculations and notes
  • Nameplate Scanner for equipment data
  • Job documentation and material lists (Pro)
Features
Read full description

VoltBook is the electrician's field toolbox: fast, accurate electrical calculators, searchable code references, and job documentation — built for the panel room, the lift, and the trench. All 75 calculators and every table are free and work fully offline, forever — no account required. 75 CALCULATORS, 14 CATEGORIES • Electrical basics — Ohm's law, AC power, power factor, energy cost • Conductors — voltage drop, ampacity, temperature and fill derating • Raceway — conduit fill and minimum size, with a custom cable library • Conduit and tube bending — offsets, saddles, stubs, kicks, segment bends • Motors, transformers, and VFDs — FLC, kVA, OCPD, overloads, V/Hz • Grounding and OCPD — EGC, GEC, continuous loads, breaker sizing • Fault current, instrumentation loops, PLC scaling, and unit conversions Results show their NEC references, and you can switch between the 2020, 2023, and 2026 editions. Save any calculation to a project for later. REFERENCE, WITHOUT THE FLIPPING Ampacity, conduit fill, grounding, and motor tables in a searchable format, plus a full electrical symbol library and step-by-step bending guides. AI THAT KNOWS THE TRADE Every plan includes AI requests each month — no account, key, or setup needed. Describe the job in plain language and the AI Assistant runs the verified calculators for you. Ask AI on any calculator to explain results or draft field notes, and use the Nameplate Scanner to pull data straight off motor, transformer, and VFD nameplates. VOLTBOOK PRO The calculators stay free forever. Pro unlocks the documentation workflow: • Unlimited projects and saved calculations • Material lists you can check off at the counter and send by text or email • Branded PDF calculation sheets and photo field reports • 500 AI requests a month (Free includes 5) • Bring your own OpenAI, Anthropic, Gemini, or OpenRouter API key for unlimited AI — usage billed by your provider, and your key never leaves your device Pro is available as a monthly or annual subscription. Payment is charged to your Apple ID, and subscriptions renew automatically unless canceled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store settings. VoltBook is a professional aid — always verify results against the applicable code and local amendments before installation. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://voltbook.app/Home/Privacy

Screenshots

Sparky4 screens
VoltBook4 screens

Verdict

The call

The clearest difference is update cadence: VoltBook at every 4 days against Sparky's fortnightly. VoltBook also leads on iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sparky sells 3 in-app purchases, starting at $3.99 per 7 days and VoltBook sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Sparky ships an update fortnightly, VoltBook every 4 days. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

Scorecard2 real differences · 8 level
Sparky versus VoltBook: the parameters behind the verdict, then further details
ParameterSparkyVoltBook
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyFortnightlyEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size17 MB60 MB
Age rating4+17+
DeveloperRAPHAEL MOMANYIEdward Anthony Whitfield

In-app purchases

3 purchases

Sparky

Subscriptions3
  • Oasic Pro Weekly3 Days trial$3.997 Days
  • Oasic Pro Monthly3 Days trial$9.991 Month
  • Sparky Pro Annual7 Days trial$79.991 Year
2 purchases

VoltBook

Subscriptions2
  • Pro Monthly$4.991 Month
  • Pro Annual$39.991 Year

Questions

Is Sparky free?
Sparky is free to download, with in-app purchases available.
Is VoltBook free?
VoltBook is free to download, with in-app purchases available.
Do Sparky or VoltBook have ads?
Neither Sparky nor VoltBook shows ads.
Which is updated more often, Sparky or VoltBook?
Sparky ships an update fortnightly, and VoltBook every 4 days. Most recently, Sparky was updated on October 12, 2026 and VoltBook on October 8, 2026.

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