Each Footprint combines price and volume to act as a thermometer of price strength and then alerting through color. As a rule footprint charts applied to stocks or futures, however we adopted it to forex market too. In XTick you can see footprint charts in different ways. In this image you see the 'classic' footprint charts, it displays buyers and sellers volumes in each row.

Delta chart displays a difference in byers and sellers volumes.

Volume profile charts displays the volume for each footprint.

The same as Volume profile and displays buyers and sellers volumes too.

The same as Volume profile and displays buyers and sellers volumes difference.

Double Volume profile chart displays two volume profiles in each bar, the one for sellers and the second one for buyers