COBEN Calculator

This is a COBEN calculator made with Mavo, bundled with Rollup. I'm using these two tools for the learning experience.

Isn't there another one?

I do know about DocDesk's COBEN calculator. My calculator is designed with the following goals in mind:

Easy mass data entry
Systematic calculation
Mobile friendliness
Any number of decimal places
JSON I/O

Video demo

This demo features this app as of 3d2ff90.