Ask HN: Service/app to track daily events behaviors?

Does anybody have a recommendation for a service or an app (android for me) that allow one to track events or behaviors daily. Possibly creating graphs based on input?

I remember seeing a nice one listed here in HN where you would make an account and then email the service. The service would then create nice graphs and keep logs. It was free and quite nice but after about 4 hours of searching I just can't find it.