OptiRange

OptiRange is a visual distance estimation simulator that helps you understand the relationship between visual angles, object heights, and distances.

Using a simple trigonometric formula (Distance = Height / tan(Angle)), you can estimate how far away an object is when you know its actual height and can approximate the visual angle from your viewpoint.

Features:
Distance calculator with adjustable angle slider (1° - 90°)
Quick-select chips for common object heights (person, car, tree)
12 built-in object presets with real-world average heights
Interactive triangle diagram that updates with your inputs
Unit conversion (meters, feet, kilometers)
Calculation history stored locally on your device

All calculations are performed locally using pure mathematics — no camera or sensor required.