We (Polarr.co) have multiple products running on multiple platforms. We're currently using GA to track all our services. First of all, the non premium version can't aggregate all the views into one and the premium version is insanely priced. 2ndly, GA doesn't seem to set up around tracking a user's precise return behavior through anonymous id. We'd like to know when was the exact last time, last last time, or last last last time a user used our product, how many times and exactly when a user returned. Being able to produce charts automatically to analysis the MAU segments into resurrected/retained/churn users, and being able to plot ratios are also important. We're thinking about building this tool internally as we can't find an option in the market that's doing that. I'd like to know opinions from you guys.