Pulley Calculator vs Gear Simulation & Calculation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Calculate Belt Length
- Calculate Ratio
- Calculate RPM
- Calculate Belt Speed
- Instant calculations
- Copyable results
- Includes formulas
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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.
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.
- Calculate gear ratio
- Calculate torque and speed
- Simulate gear train operation
- Input/output gear teeth number
- Calculate mechanical advantage
- Calculate wheel speed and diameter
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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
Verdict
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
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.
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.
Both ship on a similar rhythm, roughly every 46 months. The most recent releases landed on September 18, 2026 and August 26, 2026 respectively.
| Parameter | Pulley Calculator | Gear Simulation & Calculation |
|---|---|---|
| Price | $2.99 — better | $3.99 |
| Rating | 3.7 (34 ratings) | 4.3 (11 ratings) — better |
| Positive reviews | 25.0% of reviews | 50.0% of reviews — better |
| Number of ratings | 34 — better | 11 |
| Update frequency | Every 46 months | Every 46 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Best chart rank | — | #192 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13 — better | 15.0 |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Nitrio | Heng Jia Liang |
Customer experience
Pulley Calculator
Gear Simulation & Calculation
In-app purchases
Pulley Calculator
No in-app purchases
Gear Simulation & Calculation
No in-app purchases
Questions
Is Pulley Calculator free?
Is Gear Simulation & Calculation free?
Which has better reviews, Pulley Calculator or Gear Simulation & Calculation?
Do Pulley Calculator or Gear Simulation & Calculation have ads?
Which is updated more often, Pulley Calculator or Gear Simulation & Calculation?
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