The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From James Campbell:
Fractio is a calculator for people that deal with plans, patterns, models, etc. In addition to plain numbers using either decimal or fractional notation, it can calculate linear measurements, areas, volumes, and weights, all in a variety of units including US and metric units. It includes easy conversion between the supported measurement units. Fractio displays numbers in "natural" format (not scientific notation), and is intended to calculate numbers that people use commonly. It includes memory, rounding, percentage, square/square root, trig, and log functions.Send bug reports, feature requests, etc to FractioApp@gmail.com