Ohms Law Calc. vs Resistor Calc+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
Resistor Calc+
This utility helps you determine the resistance value of resistors by interpreting their colored bands. It supports 3, 4, 5, and 6 band resistors, visually displaying your selections and the calculated resistance and tolerance.
- Calculates resistance for 3-6 band resistors
- Visual band color selection
- Displays resistance and tolerance
- Aids electronics configuration
- User-friendly interface
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Resistor color code calculator helps determine the resistance value indicated by the colored band. You can use it for 3, 4, 5 and 6 band resistors. You can click the band in the color table to select a color for that band. The resistor visually shows your band color selection and displays the corresponding resistance value. It will help you configure your electronics. How to use the resistance color code calculator - Please select the number of band colors first. - Select the color of the band by clicking on the corresponding box in the color chart. - The corresponding resistance value and the tolerance of the resistance are displayed.
Screenshots
Verdict
The clearest difference is in-app purchases: Resistor Calc+ at none against Ohms Law Calc.'s 1. Resistor Calc+ also leads on rating (5.0 vs 4.7) and review sentiment (67% vs 50%). Ohms Law Calc.'s advantage is ratings volume (1.3K vs 5). On price, update cadence, ads 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
Both are free to download. Ohms Law Calc. sells 1 one-off in-app purchase. Resistor Calc+ asks for nothing beyond the download.
Resistor Calc+ holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Ohms Law Calc. has 1.3K ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 50% of Ohms Law Calc.'s written reviews are positive against 67% of Resistor Calc+'s.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.
| Parameter | Ohms Law Calc. | Resistor Calc+ |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.3K ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 50.0% of reviews | 66.7% of reviews — better |
| Number of ratings | 1.3K — better | 5 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 59 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | V PUGAZHENTHI | EONSOFT |
Customer experience
Ohms Law Calc.
Resistor Calc+
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
Resistor Calc+
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ohms Law Calc.
- Ohms Law Calc.$3.99
Resistor Calc+
No in-app purchases
Questions
Is Ohms Law Calc. free?
Is Resistor Calc+ free?
Which has better reviews, Ohms Law Calc. or Resistor Calc+?
Do Ohms Law Calc. or Resistor Calc+ have ads?
Which is updated more often, Ohms Law Calc. or Resistor Calc+?
Other comparisons
