Zulip is considered a legitimate platform. Reviews from various sources indicate that it is a reliable and effective team chat application. Users appreciate its threaded conversations, which help in managing multiple discussions simultaneously. The platform is praised for its open-source nature, allowing for customization and flexibility.
However, there are some negative reviews on platforms like Trustpilot, where users have reported issues with customer support and communication. Despite these isolated complaints, the overall consensus is that Zulip is a trustworthy and efficient tool for team communication.