Professional Stair Builders don't need an app to build stairs, they just know how to build stairs. This iPhone app is for rough frame carpenters that don't build stairs everyday, but could use an stair building app calculator to check their stair building calculations.
Build a set of stairs that you are gonna be proud of. With Stair Tangent you can elimenate cumulative math errors when building - constructing stairs.

Six different types of stairs
Build Stairs with:
Locked Tread Width
Unlocked Tread Width
45 Degree Stair Stringers
Flared Stair Stringers
Circular Stairs
Stair Landing Height

Enter a couple of dimensions to see all of the information you need to build your stairs.
Layout circular stairs in 10 minutes or less.

Stair Riser Height and Stair Tread Width Building Code Complaint
Error checking for Minimum stair Riser height of 4 1/2". Error checking for Maximum stair Riser height of 7 3/4".
Error checking for Minimum Stair Tread Width of 10".
Error checking for Circular Stairs with Minimum Stair Inside Tread width of 8". Error checking for Circular Stairs with Minimum Stair Walk Line Tread width of 10".