Intercom makes communicating with your customers simple, personal, and fun for everyone. It is an innovative CRM application which let you interact with your customers/users either by email or live on your website when they are browsing it.
Intercom's user database lets you segment your users based on actions that they perform in your app.
Drift is a great alternative to intercom even though it has come later in to the in-app support space. The costing for the feature sets i needed were cheaper on drift. Intercom can become cheaper if you start taking package dealsIn-App Support Tools Intercom