Zendesk Chat offers Free Trial, but Sirena does not.
Sirena is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Zendesk Chat is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Sirena Starts at $99/Month whereas for Zendesk Chat Starts at $19/User/Month when Billed Yearly.
Some top alternatives to Sirena includes ZoomInfo Chat, LiveAgent, LiveChat, DeskMoz, Zendesk Chat, Qonvo, Smartchat, JivoChat, Video Service Desk and Let's Talk.
Some top alternatives to Zendesk Chat includes ZoomInfo Chat, LiveAgent, LiveChat, LiveEngage, Intercom, Comm100 Live Chat, Smartchat, raychat, Freshchat, RingCentral Engage Digital and Let's Connect.