Zendesk is the more common of the two in our index: it runs on 6,838 websites against 7 for Glassix. Counts come from real scans of each site's home page, not vendor claims, and cover the sites in TechLookup's index rather than the whole web.
Glassix is an omnichannel messaging platform for service, sales, and support centers.
Zendesk is a cloud-based help desk management solution offering customizable tools to build customer service portal, knowledge base and online communities.
Within the live chat sites we have indexed, Glassix holds 0.0% and Zendesk 44%.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.