The phrase "slicker interface" means a more modern, smooth, and attractive design or appearance of a software, app, or website that is easier to use and navigate. Full definition
The company's growth in recent years has slowed down as other distributors such as Draft2digital, StreetLib and PublishDrive have moved in with slicker interfaces. (rogerpacker.com)
Honestly, it's basically the same as Tweetbot featurewise, although the UI is a little rougher around the edges than the more slick interface of its competitor. (theverge.com)
Combine those channels with an increasingly - slick interface on phones, tablets, and TV devices, and FuboTV makes a strong case for sports fans who don't have cable — or at least a subset of them. (techhive.com)