Comparison

Pulley Calculator vs Gear Simulation & Calculation

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

Head to head
About

Pulley Calculator

This engineering calculator helps determine belt length, ratio, RPM, and belt speed for pulley systems. It offers instant calculations with copyable results and includes formulas for reference.

Highlights
  • Calculate Belt Length
  • Calculate Ratio
  • Calculate RPM
  • Calculate Belt Speed
  • Instant calculations
  • Copyable results
  • Includes formulas
Features
Read full description

Pulley Calculator is a engineering calculator to calculate Belt Length, Ratio, RPM, Belt Speed, Pulley Gap. Features: - Instant calculation - Result are copy able to other apps - RPM are calculate once one of the RPM[Larger or Small] receive input - Formulas are include as reference A pulley is simply a wheel with a groove in it, and a rope in the groove. It is also called a drum or a sheave. The groove is important because it helps to keep the rope in place. It is used to lift up or lower heavy objects. With a pulley, an object to be lifted can be tied to one end of the rope, and a force is applied to the other end by pulling the rope downwards. The downward force turns the wheel with the rope and pulls the load upwards at the other end. it designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell that does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

About

Gear Simulation & Calculation

This tool calculates gear ratios, torque, and speed for gear train systems. It allows users to simulate how these systems work on the fly, aiding in the design of custom gear systems before physical creation. Ideal for DIY enthusiasts and engineers.

Highlights
  • Calculate gear ratio
  • Calculate torque and speed
  • Simulate gear train operation
  • Input/output gear teeth number
  • Calculate mechanical advantage
  • Calculate wheel speed and diameter
Features
Currently charting
Read full description

Gear Simulation and Calculation calculate the gear ratio, torque and speed of gears train system. Plus quickly simulate how the gear train work on the fly. This is a great tool especially for DIYer who want to design their own Gears Train System quick and easy. Preview how these system work before 3D print own gear system. Features: ∙ Calculate gears fast and easy with parameter ∙ Input gear teeth number ∙ Output gear teeth number ∙ Input gear speed [rpm] ∙ Output gear speed [rpm] ∙ Input gear torque [Nm] ∙ Output gear torque [Nm] ∙ Output wheel diameter [in/cm] ∙ Calculate wheel speed [mph/kmh/ms⁻¹] ∙ Calculate Gear Ratio ∙ Calculate Mechanical Advantage Formula: Gear Ratio = input gear teeth number / output gear teeth number Mechanical Advantage = output gear teeth number / input gear teeth number Wheel Speed = output gear speed * wheel diameter * .pi * 60 / 63360 Law of Gearing: T1/T2 = d1/d2 = n1/n2 = ω1/ω2 T1 and T2 = Number of Teeth on driver and driven gear respectively. d1 and d2 = driver and driven gear diameter respectively. n1 and n2 = Gear Speed in RPM for driver and driven gear respectively. ω1 and ω2 = Angular Velocity in radian/sec for driver and driven gear respectively. A gear is a circular machine element that can control the rotational movement's direction, torque, and speed. Gears are a necessary component of any machine having moving parts, such as a wristwatch or a car. are important components in modern engineering. A Gear train consists of two or more gears in series. It is used to increase or decrease the speed or torque of the output shaft. The Gear Calculator calculates the mechanical advantage of a two-gear system in a machine. The gear ratio indicates how much a system's output gear is sped up or slowed down, as well as how much torque is lost or gained. Gears available in a variety of shapes and sizes (the most common are involute gears), and these distinctions indicate how the rotating movement is translated or transferred. When two or more gears in a system mesh together while in motion, movement is transmitted. This set of gears is referred to as a gear train. In a gear train, the gear ratio is the ratio of the input gear circumference to the output gear circumference. The gear ratio is used to calculate the number of teeth required for each gear to achieve the specified output speed/angular velocity, or torque. Mechanical advantage in terms of torque Riding a bike uphill is easier if you use a low-speed gear. When you do this, you get more torque and more power when travelling uphill. Mechanical advantage in terms of speed Hand drills are a good example of a simple machine that has a mechanical speed advantage. The drill bit spins at a high speed when the handle is cranked. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

Screenshots

Pulley Calculator4 screens
Gear Simulation & Calculation4 screens

Verdict

The call

The clearest difference is rating: Gear Simulation & Calculation at 4.3 against Pulley Calculator's 3.7. Gear Simulation & Calculation also leads on review sentiment (50% vs 25%) and chart position (#192 vs unranked). Pulley Calculator's advantage is ratings volume (34 vs 11) and price ($2.99 vs $3.99). On update cadence, ads, in-app purchases and monetization model 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

Pulley Calculator costs $2.99 and Gear Simulation & Calculation $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Gear Simulation & Calculation holds the better App Store score, 4.3 against 3.7. Both are backed by a comparable volume of ratings — 34 and 11 respectively. Written reviews point the same way: 25% of Pulley Calculator's written reviews are positive against 50% of Gear Simulation & Calculation's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 46 months. The most recent releases landed on September 18, 2026 and August 26, 2026 respectively.

Scorecard6 real differences · 5 level
Pulley Calculator versus Gear Simulation & Calculation: the parameters behind the verdict, then further details
ParameterPulley CalculatorGear Simulation & Calculation
Price$2.99 — better$3.99
Rating3.7 (34 ratings)4.3 (11 ratings) — better
Positive reviews25.0% of reviews50.0% of reviews — better
Number of ratings34 — better11
Update frequencyEvery 46 monthsEvery 46 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#192 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13 — better15.0
Further details — not scored
Size1 MB1 MB
Age rating4+4+
DeveloperNitrioHeng Jia Liang

Customer experience

Pulley Calculator

All ratings34 ratings
Positive64.7%
Neutral11.8%
Negative23.5%
Written reviews8 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

Gear Simulation & Calculation

All ratings11 ratings
Positive81.8%
Neutral9.1%
Negative9.1%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

In-app purchases

None

Pulley Calculator

No in-app purchases

None

Gear Simulation & Calculation

No in-app purchases

Questions

Is Pulley Calculator free?
Pulley Calculator costs $2.99, with no in-app purchases.
Is Gear Simulation & Calculation free?
Gear Simulation & Calculation costs $3.99, with no in-app purchases.
Which has better reviews, Pulley Calculator or Gear Simulation & Calculation?
Gear Simulation & Calculation is rated higher. Pulley Calculator averages 3.7 out of 5 from 34 ratings, while Gear Simulation & Calculation averages 4.3 from 11 ratings.
Do Pulley Calculator or Gear Simulation & Calculation have ads?
Neither Pulley Calculator nor Gear Simulation & Calculation shows ads.
Which is updated more often, Pulley Calculator or Gear Simulation & Calculation?
Pulley Calculator ships an update every 46 months, and Gear Simulation & Calculation every 46 months. Most recently, Pulley Calculator was updated on September 18, 2026 and Gear Simulation & Calculation on August 26, 2026.

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