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

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.