Although Facebook has increasingly provided more and more application analytics to developers over the last year, developers who require more insight into their users’ behavior must roll their own analytics toolkits or turn to third parties. We recently profiled top Facebook application analytics providers, and new startup Kontagent is emerging as one of the most powerful early products.

Kontagent was originally an app company started by Albert Lai and Jeffrey Tseng. The company built such advanced internal analytics tools that they decided to turn themselves into an analytics company instead. Now, the company is helping developers understand their users, improve their products, and connect with advertisers. We’ll focus on the product here.

Kontagent offers 3 main features: cohort analysis, “virality” analysis, and A/B tracking.

• Cohort analysis allows developers to slice and dice users according to their install date, install source, app version, and demographic. This is a powerful way for developers to see which partners and campaigns are driving the most valuable adoption.
• Virality analysis allows developers to track performance of each viral channel overall, and each message template sent through that channel. Specifically, Kontagent tracks invites sent per user, invite/notification conversion rates, and invite response delay.
• A/B testing allows developers to compare acceptance rates, outbound invite events, accepted invites, and response delay across message templates. A/B testing correctly is an important part of optimizing the performance of each of your communication channels.

In terms of technical setup, Kontagent provides a wrapper for the Facebook client library, that calls Kontagent methods when certain Facebook API methods are called. While Kontagent only supports Facebook apps at the moment, it plans on adding support for MySpace applications in the future.

Overall, Kontagent looks like a solid product, especially for those developers that don’t have the resources to build their own product analytics tools. For now, Kontagent is free for developers, but it does plan on charging for premium features in the future.

For further reference, see the company’s own feature comparison sheet: