Hextom: Free Shipping Bar

The best app for this purpose, i'd tried several before but they didn't work properly, they never took into account any discounts being applied so the amount needed for free shipping was always wrong. The developers of this app even checked my store beforehand to make sure their app would work as I wanted, and once installed they even made an edit to something for me to make it even better. Highly recommend, great customer service :)