Comparison

Ohmulator vs Electric Motors Speed Calc

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

Head to head
About

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.

Highlights
  • Ohm's Law calculations
  • Calculate unknown variables
  • Adjustable unit types
  • Total resistance calculator
  • Supports Voltage, Current, Resistance, Power
Features
Read full description

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.

About

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.

Highlights
  • Instant calculations
  • Copyable results
  • Included formulas
  • Supports 16 decimal places
  • Multiple unit support
  • Lightweight and optimized
Features
Read full description

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

Ohmulator4 screens
Electric Motors Speed Calc4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Ohmulator versus Electric Motors Speed Calc: the parameters behind the verdict, then further details
ParameterOhmulatorElectric Motors Speed Calc
Price$0.99 — better$2.99
Rating4.7 (79 ratings) — better4.0 (8 ratings)
Positive reviews81.1% of reviews100.0% of reviews — better
Number of ratings79 — better8
Update frequencyEvery 2 months — betterEvery 26 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better13
Further details — not scored
Size5 MB2 MB
Age rating4+4+
DeveloperArmchair EngineeringNitrio

Customer experience

Ohmulator

All ratings79 ratings
Positive92.4%
Neutral5.1%
Negative2.5%
Written reviews37 reviews
Positive81.1%
Neutral8.1%
Negative10.8%

Electric Motors Speed Calc

All ratings8 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Ohmulator

No in-app purchases

None

Electric Motors Speed Calc

No in-app purchases

Questions

Is Ohmulator free?
Ohmulator costs $0.99, with no in-app purchases.
Is Electric Motors Speed Calc free?
Electric Motors Speed Calc costs $2.99, with no in-app purchases.
Which has better reviews, Ohmulator or Electric Motors Speed Calc?
Ohmulator is rated higher. Ohmulator averages 4.7 out of 5 from 79 ratings, while Electric Motors Speed Calc averages 4.0 from 8 ratings.
Do Ohmulator or Electric Motors Speed Calc have ads?
Neither Ohmulator nor Electric Motors Speed Calc shows ads.
Which is updated more often, Ohmulator or Electric Motors Speed Calc?
Ohmulator ships an update every 2 months, and Electric Motors Speed Calc every 26 months. Most recently, Ohmulator was updated on October 22, 2026 and Electric Motors Speed Calc on October 5, 2026.

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