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Some times free live chat tool interrupt you just because of limited access. For the smooth customer communication, You should require premium live chat software like Live2Support. You can have Live2Support in just $9.99/month. Free trial is also available for 15 days. When you satisfied with service, ask them to convert your account in paid account.
Subiz Live chat is my best choice.
I tried using some software but I say Subiz stands out and it's really suitable for my site. Subiz helps me control my support team effectively and increase my sales significantly.