Choosing the right motor for a robot involves complex tradeoffs between power, weight, and battery life. An interactive tool could recommend optimal motors based on simple input parameters.
Robotics teachers and hobbyists would pay for premium features like comparison charts and vendor links. Motor manufacturers might sponsor recommended products.
MVP would be a basic calculator with common motor specs preloaded. Later add 3D visualization of forces.
Risk includes keeping motor databases current as new models emerge.