Comparison

Ohms Law Calc. vs CircKit

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

Head to head
About

Ohms Law Calc.

This app provides a comprehensive suite of electrical calculations, including Ohm's Law, voltage drop, wire sizing, and impedance. It also offers numerous converters for various electrical units and parameters, aiding in circuit design and analysis.

Highlights
  • Ohm's Law calculations
  • Voltage drop calculator
  • Wire size calculator
  • Impedance calculations (R, L, C)
  • Electrical unit converters
  • Power and current conversions
  • Circuit design tools
Features
Read full description

Ohm's Law Calc. consists of 60 Electrical Calculators with Formulas and Circuits and 16 Electrical Converters. • Voltage Calculator • Current Calculator • Resistance Calculator • Power Calculator • Voltage Drop Calculator • Wire Size Calculator • DC Generator Calculator • Transformer Calculations (Voltage & Current) Impedance Calculators Calculate impedance for combinations of resistors (R), inductors (L), and capacitors (C) in both series and parallel configurations: • R and L in Series / Parallel • R and C in Series / Parallel • L and C in Series / Parallel • R, L and C in Series / Parallel Power and Current Conversions • kVA to Amps (Single Phase & Three Phase) • Amps to kVA (Single Phase & Three Phase) • Single Phase & Three Phase Power Calculators • Horsepower Calculators (DC, Single Phase, Three Phase) Efficiency and Power Factor Tools • Efficiency Calculators (DC, Single Phase, Three Phase) • Power Factor Calculators (Single Phase & Three Phase) Energy Storage Calculators • Energy Cost Calculator • Energy Storage Calculators (Resistance, Inductance, Capacitance) Circuit Design Tools • Star-to-Delta and Delta-to-Star Conversions • Inductive & Capacitive Reactance Calculators • Resonant Frequency Calculator • Inductor and Capacitor Sizing Equations Component Calculations • Series and Parallel Calculators for Resistance, Inductance, and Capacitance • Unknown Resistance and Capacitance Calculators (Series & Parallel) More Calculations • Neutral Current (3-Phase Unbalanced Loads) • Characteristic Impedance (Parallel & Coaxial) • Transformer Calculator • Voltage Divider Calculator Illumination Calculators • Luminous Intensity Calculator • Luminous Flux Calculator • Solid Angle Calculator Electrical Converters • Field Strength Converter • Electrical Potential Converter • Resistance and Resistivity Converters • Conductance and Conductivity Converters • Capacitance and Inductance Converters • Charge Converters: Handles conversions for electrical charge, including: • Linear Charge Density • Surface Charge Density • Volume Charge Density • Linear Current Density • Surface Current Density • Power Converter App works with both iPhones, iPads and Mac Multiple Unit Compatibility: Supports a wide range of units for all electrical parameters, including Ohms, kiloOhms, Farads, Henrys, kVA, Volts, Weber, and more.

About

CircKit

This app provides essential electrical calculations and reference tools for electricians, contractors, and engineers. It offers advanced calculators for motor sizing, voltage drop, and more, alongside a professional reference library and built-in productivity tools.

Highlights
  • Motor sizing and protection calculators
  • Voltage drop calculator
  • Transformer sizing
  • Pipe and box fill calculators
  • Professional reference library
  • Integrated notes app
  • Unit converter
Features
Read full description

The essential electrical app for professionals. From motor sizing to voltage drop calculations, get instant results with tools designed for electricians, contractors, and engineers. Solve complex electrical problems quickly and stay compliant with the Canadian Electrical Code. AI-POWERED ASSISTANCE • Ask Sparky, your new AI electrical assistant, for help with electrical questions • Access Sparky through Siri on Apple Intelligence-compatible devices • Get quick answers even when you're outside the app ADVANCED CALCULATIONS • Motor sizing and protection calculators • Transformer sizing with protection specifications • Voltage drop calculations with wire derating • Conduit and box fill calculators • Arc flash incident energy calculator • PVC conduit expansion calculator • Redesigned and simplified Ohm's Law calculator • Installation assistant for project guidance • Recessed-light spacing for optimal layouts PROFESSIONAL REFERENCE LIBRARY • Expanded Canadian Electrical Code reference library with 75 new code entries • Wire and conduit trade-size tables with drill sizes and metric equivalents • NEMA plug and receptacle configurations and enclosure ratings • Data pinout references and phase colour codes • Bonding sizes, burial depths, and strap spacing • Torque specifications and wire reel estimator BUILT-IN PRODUCTIVITY TOOLS • Integrated notes accessible anywhere in the app • Completely rebuilt fraction calculator with a new tutorial • Unit converter spanning 14 categories • Code of the Day with optional daily notifications • Find tools from your Home Screen or Lock Screen with Spotlight • Share results without first saving them as notes • Navigate to jobs using Apple Maps, Google Maps, or Waze DESIGNED FOR PROFESSIONALS Enjoy a clean, intuitive interface that now supports landscape mode and resizable windows. Sparky's CircKit delivers organized tools electrical professionals can rely on for accurate, code-compliant results. Whether you're running conduit, sizing equipment, or planning an installation, Sparky's CircKit provides the calculations and reference data you need to work efficiently and safely. FREE TRIAL, THEN YOUR CHOICE Start with a 14-day free trial that unlocks every tool. The trial is free, never renews and is never charged. When it ends, choose the plan that suits you: • Monthly — $1.99 per month • Yearly — $14.99 per year • Lifetime — $39.99, a one-time purchase with no subscription Prices are in Canadian dollars and shown in your local currency elsewhere. Yearly subscribers can upgrade to lifetime access at a reduced price. ALREADY OWN SPARKY'S CIRCKIT? Nothing changes. If you bought the app before it became free to download, every tool stays unlocked for life. There is nothing to subscribe to and nothing to buy. SUBSCRIPTION TERMS Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renewal is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. You can manage your subscription and turn off auto-renewal in your Apple Account settings after purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.thesparky.work/privacy/

Screenshots

Ohms Law Calc.4 screens
CircKit4 screens

Verdict

The call

The clearest difference is ads: CircKit at none against Ohms Law Calc.'s shown. CircKit also leads on update cadence (weekly vs every 2 months) and review sentiment (79% vs 50%). Ohms Law Calc.'s advantage is monetization model (free with in-app purchases vs paid). On price, in-app purchases, device support and iOS requirement 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. Ohms Law Calc. sells 1 one-off in-app purchase and CircKit sells 9 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Ohms Law Calc. ships an update every 2 months, CircKit weekly. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Ohms Law Calc. versus CircKit: the parameters behind the verdict, then further details
ParameterOhms Law Calc.CircKit
PriceFreeFree
Rating4.7 (1.3K ratings) — better—
Positive reviews50.0% of reviews78.6% of reviews — better
Number of ratings1.3K — better—
Update frequencyEvery 2 monthsWeekly — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size59 MB50 MB
Age rating4+4+
DeveloperV PUGAZHENTHIThe Sparky

Customer experience

Ohms Law Calc.

All ratings1,328 ratings
Positive92.8%
Neutral3.5%
Negative3.7%
Written reviews44 reviews
Positive50.0%
Neutral6.8%
Negative43.2%

CircKit

Written reviews14 reviews
Positive78.6%
Neutral14.3%
Negative7.1%

Bugs and requests

Ohms Law Calc.

Reported bugs

3 issues
  • Paid version not unlocking
  • Repeatedly prompting for payment after already paid
  • Keyboard overlaying results making it difficult to see

Requested features

3 requests
  • Add more electrical conversions and calculations
  • Add ability to input voltage and resistance to get amps and watts
  • Add kVA, rms, and other popular needed conversions

CircKit

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Ohms Law Calc.

One-time1
  • Ohms Law Calc.$3.99
9 purchases

CircKit

Subscriptions2
  • Monthly$1.991 Month
  • Yearly$14.991 Year
One-time7
  • 14 Day TrialFree
  • $1 Tip$0.99
  • $5 Tip$4.99
Show 4 more
  • $10 Tip$9.99
  • $20 Tip$19.99
  • Discounted Lifetime$22.99
  • Lifetime Access$39.99

Questions

Is Ohms Law Calc. free?
Ohms Law Calc. is free to download, with in-app purchases available.
Is CircKit free?
CircKit is free to download, with in-app purchases available.
Do Ohms Law Calc. or CircKit have ads?
Ohms Law Calc. shows ads; CircKit does not.
Which is updated more often, Ohms Law Calc. or CircKit?
Ohms Law Calc. ships an update every 2 months, and CircKit weekly. Most recently, Ohms Law Calc. was updated on October 29, 2026 and CircKit on October 25, 2026.

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