Here's how they describe themselves:
"Started in rainy Vancouver, BC, Sizzr was created as a fun option for women looking for a simple way to meet other nearby, like minded women within their immediate proximity. What you decide to do when you meet is your call, we're just here to facilitate non-harrowing girl/girl introductions ;)"
Who knew that girl/girl introductions were harrowing?
I don't have a smart phone, so I can't check personally that it works just like Grindr and Tinder, though I'm told that it does.
I would be fascinated to hear from women who have used it. Are the results more like Grindr, more like Tinder or something completely different?