Hall vs Zulip: What are the differences?
What is Hall? Real-time business chat & texting for teams. Hall is group chat, IM and video chat for companies and teams. Available free for the web, desktop and mobile. FREE anytime, anywhere.
What is Zulip? Powerful open source team chat. Zulip is powerful, open source team chat that combines the immediacy of real-time chat with the productivity benefits of threaded conversations Zulip allows busy managers and others in meetings all day to participate in their teams chats..
Hall and Zulip can be primarily classified as "Group Chat & Notifications" tools.
"Free" is the primary reason why developers consider Hall over the competitors, whereas "Open source" was stated as the key factor in picking Zulip.
Zulip is an open source tool with 10.1K GitHub stars and 3.11K GitHub forks. Here's a link to Zulip's open source repository on GitHub.