Jeans. In a perfect world, you'd try on a pair, they'd fit, you'd buy them, and everybody could go home.

The reality's a little different. Low waist? Ultra-low waist? Bootcut, flare, skinny, stovepipe? Stretch, no stretch? Enter Zafu. The Emeryville, Calif.-based company has charted the world of women's denim, layered a highly scientific algorithm on top and promises to "find your perfect jeans in three minutes."

Answer eight questions about your body and the jeans you usually wear, and Zafu will plumb its database of fit research and spit out the best options for your shape (with links to online retailers, so you can have the whole process sewn up fast). Zafu handles sizes up to 28, and is adding a finder for pants and bras soon.