FreshRSS looks great too, the main differences might be the mobile client (seems missing in FreshRSS) and the possibility of using SQLite as a database (not advertised for TT-RSS). Thanks for the link!
Like siblings said, FreshRSS is supported out of box on many mobile clients already (including my favorite -- Reeder, and second favorite -- Unread), so a first-party client is unnecessary. On the contrary, TT-RSS seems to at least need a plugin to be used with my clients.
Apparently[1] FreshRSS implements the Fever API, which is compatible with a few nice iOS clients at least. I'm using Reeder[2] with Miniflux[3], which implements the same API, and am very happy with the combination.
FreshRSS has a nice mobile interface, no client (app) needed. On my installation I added one extension to minimize the mobile menu bar size a bit more, and it would be nice if long titles wrapped better but it's very usable.
