Mattermost offers Free Trial, but Zulip does not.
Mattermost is designed for Large Enterprises, Medium Business and Small Business.
Zulip is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Mattermost Starts at $3.25/User/Month whereas for Zulip Starts at $6.67/User/Month.
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 Zulip includes mi.team, Slack, Glip, Google Chat, Dialog, Office Chat, mais.im, Brosix, Teamwork Chat and Discourse.