We've actually had retention since we launched nearly three years ago, but this release gives it a lot more love. The new stuff: 1. You can calculate birth co

We've actually had retention since we launched nearly three years ago, but this release gives it a lot more love. The new stuff: 1. You can calculate birth cohort retention based on anything (signup date, date of first payment, app install date, etc). Basically, the grouping of your users is configurable. 2. You can filter and segment retention based on the properties you send. This lets you look at how things like A/B test version, Ad version, or user type impact retention rates. 3. The visualization is prettier! We're really excited about how flexible Retention is now. We'd hacked in a little flexibility before, but this is dramatically better.