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 ClickUp or Zulip?
Zulip has a G2 Score of 4.2/5 and is an open-source tech market segment platform. Their entry-level price is $6.67/user/month, and they do not offer a free trial. However, they do offer a free version, custom domain name, workspace, and user activity, chat, file sharing, mentions, 1-1 video calls, group video calls, whiteboarding, screen sharing, audio calls, recording, participant permissions, branding removal, user profiles, storage starting at 5GB, newsfeed, "do not disturb" mode, and help resources such as customer service, email, FAQ, forum, knowledge base, chat, and phone. Zulip also has a mobile, web, and desktop app, integrations, API, on-premise, SAML/SSO authentication, end-to-end encryption, and data and user import from Slack, Gitter, Mattermost, and Rocket.Chat.