Rocket.Chat offers Free Trial, but Zulip does not.
Rocket.Chat is designed for Large Enterprises, Medium Business and Small Business.
Zulip is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Rocket.Chat Starts at $2/User/Month when Billed Yearly whereas for Zulip Starts at $6.67/User/Month.
Some top alternatives to Rocket.Chat includes Slack, Glip, Google Chat, Zulip, IRCCloud, ChatWork, Dialog, CometChat, Teamwork Chat and Echo.
Some top alternatives to Zulip includes mi.team, Slack, Glip, Google Chat, Dialog, Office Chat, mais.im, Brosix, Teamwork Chat and Discourse.