There is a 3rd alternative...
Atolia, the one and only workspace your team needs
Atolia is a power-packed all-in-one digital workplace: Chat, Video calls, Tasks & Projects, Calendars, Documents, Notes...
Accelerate your team's collaboration game.
Implement it in minutes and save money. Atolia is cheaper than most of the business instant messaging apps.
Why choose Clinked or Zulip?
Zulip, on the other hand, is an open-source platform geared towards the tech industry. They have a G2 score of 4.2/5 and an entry-level price of $6.67/user/month. Zulip offers features such as user profile, screen sharing, audio call, and recording. They also have a dedicated help resources section with customer service, email, FAQ, forum, knowledge base, chat, and phone support. Zulip has a free version available, but no free trial. They also offer data imports from Slack, Gitter, Mattermost, Rocket.Chat.