Easy Breezy Frozen Yogurt just opened in the Inner Sunset this past month, and I checked it out. It's the second branch of the business in Noe Valley.
They had one flavor of frozen custard in addition to the various types of yogurt (both tart and sweet). The custard was creamy and rich, and I thought it was pretty decent. The yogurts were fine (pretty average). Topping selection was pretty nice, and they had a new interesting things: soft cookie-dough (not just the little hard nuggets), rice krispy treats, popping boba, mochi, and various cookies/crumbles. Fresh fruit toppings were also decent. Not the biggest selection ever, but good quality.
Probably not a destination, but worth a try if you're in the neighborhood or in the park on a hot day (ha!).