Zopim was a huge disappointment for us for too many reasons. Kayako is really convenient, yet they tend to change interface and button\canned replies structure with each new versions, which is really inconvenient and requires to adapt to each new version. We currently use LiveZilla, because it is minimalistic, simple in usage and acts both as a chat and a ticket system - if there is no one on shift chat request is saved as a ticket, so customer does not have to contact you twice.
The choice is up to you, however.
- your content is online, always :)
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