HTC is the original design manufacturer for many Android and Windows Phone-based smartphones and PDAs. Brands that have marketed or previously marketed HTC-manufactured products include Dell, Fujitsu Siemens, HP/Compaq, i-mate, Krome, O<sub>2</sub>, Palm, Sharp Corporation, and UTStarcom. HTC also manufactures ultra-mobile PCs, and is also the manufacturer of the Nexus One and Nexus 9, a smartphone and tablet designed and branded by Google, respectively.
HTC 10 evo (also known as bolt) needs to be added to the above figure reference is here: https://www.htc.com/us/smartphones/htc-bolt/buy/
These devices were created under contract for a single non-carrier manufacturer and not branded by HTC, any carriers, or any other manufacturer. For this reason, none of them feature any custom HTC UI.