CleverTap is a user engagement and analytics platform. The platform lets you do app analytics, provides ready answers, and engages with your users via push notifications, in-app messages, emails or web notifications. They have a freemium platform which is free for up to 10 million events per month. When you start a paid tier you get $2500 credit to be applied against your payment. The offer will expire at the end of 12 months from the date of sign up.