the first image is Riot circa 2015 (back when it was called Vector). You can run it if you really want from https://riots.im https://riots.im. Tchap meanwhile

the first image is Riot circa 2015 (back when it was called Vector). You can run it if you really want from https://riots.im https://riots.im. Tchap meanwhile is opensource at https://github.com/dinsic-pim https://github.com/dinsic-pim and there are unofficial builds which let you use it as a general purpose Matrix client. However, we're busy improving Riot's UX in general to make it easier to grip - on Mobile that ends up being a rewrite (RiotX), on Web we're iterating incrementally.