Crown Molding Tools is an iPhone app with functions to calculate complex crown miter and bevel angles that other calculators don't offer.

Crown Molding Miter Angle and Saw Blade Bevel Angles
Cathedral ceiling rake crown molding miter and bevel angles
Vaulted ceiling rake crown molding miter and bevel angles
Rake Crown Molding Miter and Bevel Angles
Polygon Crown Molding Miter and Bevel Angles
Radius BullNose Crown Molding Miter and Bevel Angles and width
Horizontal to Rake Crown Molding Miter and Bevel Angles
Calculate Crown Molding Spring Angles
Calculate Horizontal to Rake Wall No Transitions
Calculate Rake Wall To Horizontal at Corner Wall No Transitions
Calculate Rake Crown to Rake Crown No Transitions
Calculate Rake To Level No Transitions
Calculate Rake To Level Return No Transitions
Calculate Rake To Rake at Peak No Transitions
Calculate Exterior Rake Moulding using 3 Different Crown Moulding Profiles

Compound Miter Angle and Bevel Angle Calculator for compound joinery.
Use this calculator to cut compound angles with the material on edge in the compound miter saw instead of laying flat in the compound miter saw.
Email the Miter Angle and Saw Blade Bevel Angles to yourself or friends.

Here's a link to screenshots of the 15 different crown moulding calculators.

http://sbebuilders.blogspot.com/2014/06/crown-moldingtools-for-iphone.html