What’s the best way to measure product usage?

Anamitra Banerji (Partner @ Foundation Capital)
The Shape Of The Curve — Medium

Most consumer software products have a DAU:MAU of 20% or lower. Zero products get to 100% but some rare ones come close to this ceiling (like Facebook 65% and Whatsapp 72%) [i.e. you should be getting better than 20% DAU:MAU]