Ohmulator vs Electric Motors Speed Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ohmulator
This electric circuit calculator simplifies Ohm's Law calculations. It allows users to input two known variables (current, resistance, voltage, or power) and automatically computes the unknown values. The app also supports on-the-fly unit adjustments, eliminating the need for manual conversions.
- Ohm's Law calculations
- Calculate unknown variables
- Adjustable unit types
- Total resistance calculator
- Supports Voltage, Current, Resistance, Power
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Makes Ohm's Law simple! Ohmulator is a simple, yet robust, electric circuit calculator that enables you to quickly find the unknown variables of a circuit. Ohmulator allows you to easily adjust unit types on the fly (eg. milli Amps, Amps, kilo Amps), which means no prior conversion! Enter two known variables (from: I = Current, R = Resistance, V = Voltage, P = Power), set preferred units, then Ohmulator will calculate and return the previously unknown values. Also an effective (total) resistance calculator. What two App Store reviewers had to say about Ohmulator: "Great. Does what it says. Very good app. Stylish design." 5 Stars - Jamie1990jamie "Awesome app. It simply works. A must have for the radioamateur or electronic nerd. Nice to have the watt law as well." 5 Stars - Per67 Also available for macOS on the Mac App Store.
Electric Motors Speed Calc
This physics calculator quickly determines electric motor power, torque, or speed. It supports various units, offers instant calculations with copyable results, and includes reference formulas. Optimized for everyday use, it's a lightweight tool for engineers and hobbyists.
- Instant calculations
- Copyable results
- Included formulas
- Supports 16 decimal places
- Multiple unit support
- Lightweight and optimized
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Electric Motors Power Torque Speed Calculator is a physics/math calculator designed to find electric motor power, torque, or speed quickly and easily. Features: - Instant calculation - Results are copyable to other apps - Formulas are included as references - Supports up to 16 decimal places - Supports various units for each input - Lightweight app with a small size, optimized for everyday use The speed for an electric motor in SI units can be calculated as n = f x ( 2 / p ) x 60 The torque for an electric motor in SI units can be calculated as T = P x 9.549 / n Where: T = torque (Nm) P = power (watts) n = revolution per minute (rpm) f = frequency of electrical power supply (Hz, cycles/sec, 1/s) p = number of poles The speed for an electric motor is determined by the power supply frequency and the number of poles in the motor winding. The torque is the twisting force and is also the driving force of an electric motor. The power produced by the motor depends on the speed of the motor, which is zero at 0% speed and normally at its peak at 100% speed. On an induction motor, the number of poles determines the speed given the frequency of the power. For example, a 2-pole motor on 60 Hz equals RPM = 60*(2/2)*60 RPM = 3600 rpm a 4 pole motor on 60 Hz equal to RPM = 60*(2/4)*60 RPM = 1800 rpm For 6 poles, 1200 rpm, and so on. As speed decreases, the torque increases, so an 8-pole motor has 4x the torque compared to a 2-pole motor with 1/4 the 8-pole motor speed. *60 Hz is the most common frequency in the US. *50 Hz is the most common frequency outside the US. Thanks for your support, and please do visit nitrio.com for more apps for your iOS devices.
Screenshots
Verdict
The clearest difference is rating: Ohmulator at 4.7 against Electric Motors Speed Calc's 4.0. Ohmulator also leads on update cadence (every 2 months vs every 26 months) and ratings volume (79 vs 8). Electric Motors Speed Calc's advantage is review sentiment (100% vs 81%). On 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
Ohmulator costs $0.99 and Electric Motors Speed Calc $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Ohmulator holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Ohmulator has 79 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 81% of Ohmulator's written reviews are positive against 100% of Electric Motors Speed Calc's, so the app with the better star average is not the one people write more warmly about.
Ohmulator ships an update every 2 months, Electric Motors Speed Calc every 26 months. The most recent releases landed on October 22, 2026 and October 5, 2026 respectively.
| Parameter | Ohmulator | Electric Motors Speed Calc |
|---|---|---|
| Price | $0.99 — better | $2.99 |
| Rating | 4.7 (79 ratings) — better | 4.0 (8 ratings) |
| Positive reviews | 81.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 79 — better | 8 |
| Update frequency | Every 2 months — better | Every 26 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 13 |
| Further details — not scored | ||
| Size | 5 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Armchair Engineering | Nitrio |
Customer experience
Ohmulator
Electric Motors Speed Calc
In-app purchases
Ohmulator
No in-app purchases
Electric Motors Speed Calc
No in-app purchases
Questions
Is Ohmulator free?
Is Electric Motors Speed Calc free?
Which has better reviews, Ohmulator or Electric Motors Speed Calc?
Do Ohmulator or Electric Motors Speed Calc have ads?
Which is updated more often, Ohmulator or Electric Motors Speed Calc?
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