Sketchup: Plugin 1001bit

Generates various stair types, including straight, spiral, and "dog-leg" stairs, with customizable treads, risers, and stringers.

The plugin for SketchUp is widely considered a "Swiss-army knife" for architectural modeling due to its collection of 39 powerful tools that automate the creation of complex building elements. Its standout feature is its parametric nature , allowing you to input specific dimensions (height, width, slope, etc.) to generate accurate geometry with a single click . Key Features & Capabilities

For most architects, is the closest direct competitor, but it costs roughly three times as much as 1001bit Pro. 1001bit remains the best value for users who primarily need stairs, roofs, doors, and windows.