Count.ly is a real-time mobile analytics tool that has been in development for around a year and a half. It allows users to track metrics like active users, sessions, device information, and app version to understand how an application is being used. The free tier supports up to 10,000 sessions per month, while higher pricing tiers that support more data start at $69 per month for 500,000 sessions. The document evaluates Count.ly positively, noting its clear visualizations and valuable analytics data, though expresses concern that usage could exceed free limits. It recommends Count.ly as a good starting point for analytics.