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 FYI Mobileware:
FYI Tip Calculator is a simple and intuitive tip calculator. It is perfect for reimbursement, record keeping and sharing: capture and email the receipt to all participants or for reimbursement. FEATURES: - Paperless - Bill Splitting- Full Rounding Options: round up, down, split up, split down, or exact - Receipt image (device with camera) - Email bill details - Integrates with iXpenseIt