Almost all of the apps stopped working long ago, and the manufacturer doesn't even push out updates anymore, but somehow the Vudu app keeps trucking along. They still use it as they prefer the built-in Vudu app to the Vudu app offered on their Xbox One.
I suppose props are in order to Vudu for supporting something so long after even the manufacturer has given up on it.
Most of the creative new ways to getting your digital copies started with them like Disc to Digital and Instawatch. Others have dabbled in it, but Vudu really made these things happen and they've continued to be the biggest in these spaces, though Best Buy has recently dabbled with giving out digital codes for preorders in advance of physical releases.
And on the front of digital ownership, they've continued to support issuing UltraViolet rights on every single title they're allowed to do so by the studios, and seem to plan to continue to until the last possible moment (Whereas Fandango voluntarily dropped it for all MA-eligible titles pretty quickly) and were immediate to grab into Movies Anywhere as well. Most digital copy codes for titles that aren't UV or MA are also redeemable on Vudu.
In the buying digital video space, they've really stood out as the safest best to ensure your purchase or digital copy will be available on any device more or less in perpetuity, and that makes them my default for it in the world where video still hasn't won good DRM-free options like music and ebooks have started to.