Mattermost offers Free Trial, but Trillian does not.
Mattermost is designed for Large Enterprises, Medium Business and Small Business.
Trillian is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Mattermost Starts at $3.25/User/Month whereas for Trillian Starts at $3.33/Month when Billed Yearly.
Some top alternatives to Mattermost includes mi.team, Rocket.Chat, Glip, Zulip, Output Messenger, Trillian, Dialog, SafeChats, Takle and Teamwork Chat.
Some top alternatives to Trillian includes Google Chat, HCL Sametime, Output Messenger, Dialog, Office Chat, mais.im, imBee, Softros LAN Messenger, Takle and Brosix.