GearCalc Pro vs SteerDisplay
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
GearCalc Pro
Read full descriptionHide full description
GearCalc Pro is the most professional gear ratio calculator and 3D simulator for hobbyists, makers, and engineers working with motorized projects. WHAT IT DOES - Calculate exact gear ratios for any motor + target speed/torque - Auto-suggest optimal gear teeth combinations across 1-6 stages - Real-time 3D visualization of compound gear trains with proper meshing - Simulate gear rotation at adjustable input RPM with live output display - Battery life estimation across 11 battery types - Reverse motor finder - given target RPM/torque, find the best motor MOTOR LIBRARY (18 models) - Ultra Micro: N10 - Micro: N20, N30, GA12-N20 gearmotor - Small: TT, DC 130/FA-130, DC 180, DC 260, DC 280 - Medium: DC 380, RS-540, RS-545, RS-550 - Large: RS-775, RS-895 - BLDC: 2208 drone motor - Stepper: NEMA 14, NEMA 17, NEMA 23 - Servo: SG90, MG996R - Custom motor input - add your own specs ENGINEERING FEATURES - Standard gear theory: D = teeth x module - Per-stage efficiency (Spur, Helical, Worm, Bevel, Planetary) - Gear pair recommendations from 21 standard tooth counts (8T to 120T) - Worm gear support with 1/2/4-start configurations - Standard ISO modules (0.3 to 4.0) - Motor dimension diagrams with shaft, bore, and mounting specs - Save/load configurations 3D VISUALIZATION - Real PBR-rendered gears with metallic shading - Color-coded stage badges - Auto-fit camera, free 3D rotation - Reset view to recenter - Start/stop animation with physics-correct rotation 8 LANGUAGES Traditional Chinese, English, Simplified Chinese, Japanese, Korean, Spanish, French, German. EXPORT - Generate spec sheet image - Copy text spec to clipboard - Share via standard iOS share sheet Whether you're designing a robot, toy, RC car, 3D printer, or CNC machine, GearCalc Pro gives you the math, the visualization, and the engineering data in one beautifully designed app.
SteerDisplay
Read full descriptionHide full description
Set the brightness and color of the LED steering wheel
Screenshots
Verdict
The clearest difference is ads: SteerDisplay at none against GearCalc Pro's shown. SteerDisplay also leads on update cadence (every 3 days vs every 3 months) and iOS requirement (13.0 vs 17.0). On price, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GearCalc Pro ships an update every 3 months, SteerDisplay every 3 days. The most recent releases landed on October 8, 2026 and October 4, 2026 respectively.
| Parameter | GearCalc Pro | SteerDisplay |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 3 days β better |
| Ads | Yes | No β better |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 13.0 β better |
| Further details β not scored | ||
| Size | 8 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Sui Fai Law | Guangzhou Chezhilian Electronics Co.,Ltd. |
In-app purchases
GearCalc Pro
No in-app purchases
SteerDisplay
No in-app purchases
Questions
Is GearCalc Pro free?
Is SteerDisplay free?
Do GearCalc Pro or SteerDisplay have ads?
Which is updated more often, GearCalc Pro or SteerDisplay?
Other comparisons
