Gear Speed - Brushless RC Speed Calculator

Name: Gear Speed - Brushless RC Speed Calculator
Price: 0.99 USD
Rating: 3.8 (118 reviews)
Author: Ultra Software Solutions, LLC

By: Ultra Software Solutions, LLC

Utilities

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Features & Capabilities

Gear Speed is the premier gearing tool for brushless RC cars. It calculates maximum speed, RPM, final drive ratio, and rollout (in inches and mm) for 1S–12S LiPo batteries.

The extension stores your setups, allows you to add notes for each run and setup change, and can email results for permanent record keeping. By inputting pinion size, spur size, transmission ratio, tire diameter, motor KV, and LiPo cells/voltage, Gear Speed delivers accurate speed data to help you optimize your gearing.

User Growth & Download Statistics

App Developer Tools Education

By:

Ultra Software Solutions, LLC

Rating:

3.80

(118)

Version:

2.1.0 Last updated: 2015-09-26

Version code:

837092959

Creation date:

2014-07-20

Compatible devices:

Size:

2.28MB

Price:

0.99

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-05

Compare stats and ranking:

Ranking

# 151,321 ▼ 58

For Developers

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Contact the developer

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Developed by:

Ultra Software Solutions, LLC

Apple Apps Store

https://apps.apple.com/us/app/gear-speed-brushless-rc-speed-calculator/id898565895

User Reviews

Reviews are mixed. Many praise Gear Speed as a useful RC gearing calculator that helps visualize how gear changes affect speed and can provide theoretical estimates when it works. However, multiple users report crashes, blank screens, or data loss; essential gear options and drivetrain features are missing; speed predictions can be inaccurate or inconsistent; and several feel the price isn’t worth it compared with free alternatives. Overall, it can be helpful when functioning, but reliability and feature gaps are frequent concerns.

Pros

Provides gear-speed calculations/theoretical speed for RC setups
Useful tool for RC enthusiasts; helps visualize how gear changes affect speed
Works as intended when functioning; users report it delivers results as advertised
Helpful for RC tuning and planning (e.g., drag racing applications) for some users

Cons

Crashes or fails to launch: blank screens, + sign leads to app disappearing, returning to device home screen
Missing essential gear configuration options (gear pitch types like 48p/32p, mod1; inability to select gear type; no differential/4WD settings)
Accuracy issues: predictions can be wildly inaccurate or inconsistent (e.g., mph estimates, post-update changes)
Low perceived value: many users feel the $0.99 price is not justified given free online alternatives
Data persistence problems: saves can reset or data input is lost/repeatedly required