Ohms Law Calc. vs Selsystem
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.
Selsystem
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Selsystem porta appuntamenti, tecnici e report operativi in un’unica app. Pensata per chi lavora sul campo e deve avere sempre i dati aggiornati. Meno passaggi manuali, più controllo sulle attività quotidiane. Con Selsystem puoi: • Consultare gli appuntamenti assegnati • Gestire il calendario operativo • Visualizzare dettagli cliente, officina e intervento • Compilare e aggiornare report di riparazione • Lavorare con flussi pensati per tecnici e amministratori • Accedere a informazioni utili anche durante le attività fuori sede • Sincronizzare i dati con il sistema aziendale • Gestire note, allegati e avanzamento delle attività Selsystem aiuta a rendere più ordinato il lavoro tra ufficio, tecnici e appuntamenti, riducendo dispersioni e semplificando la consultazione delle informazioni operative.
Screenshots
Verdict
The clearest difference is in-app purchases: Selsystem at none against Ohms Law Calc.'s 1. Selsystem also leads on ads (none vs shown) and update cadence (every 8 days vs every 2 months). On price, 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
Both are free to download. Ohms Law Calc. sells 1 one-off in-app purchase. Selsystem asks for nothing beyond the download.
Ohms Law Calc. ships an update every 2 months, Selsystem every 8 days. The most recent releases landed on October 23, 2026 and October 10, 2026 respectively.
| Parameter | Ohms Law Calc. | Selsystem |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.3K ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 1.3K — better | — |
| Update frequency | Every 2 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 59 MB | 99 MB |
| Age rating | 4+ | 4+ |
| Developer | V PUGAZHENTHI | PURPLESOFT SRL |
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
Selsystem
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ohms Law Calc.
- Ohms Law Calc.$3.99
Selsystem
No in-app purchases
Questions
Is Ohms Law Calc. free?
Is Selsystem free?
Do Ohms Law Calc. or Selsystem have ads?
Which is updated more often, Ohms Law Calc. or Selsystem?
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