Olark is described as 'Comes with a wide range of features to help you customize and manage your live chat experience. Scroll down to see why Olark is super simple yet jam packed with customization, reporting and engagement functionality' and is a Help Desk platform in the business & commerce category. There are more than 100 alternatives to Olark, not only websites but also apps for a variety of platforms, including Android, iPhone, Windows and iPad apps. The best Olark alternative is HelpCrunch. It's not free, so if you're looking for a free alternative, you could try FreeScout or tawk.to. Other great sites and apps similar to Olark are Text App, Zendesk Chat, Tidio and Userlike.
Much cheaper, so far, so good.