We track only the most minimal data points.
We specifically track when a reminder was made or created.
This lets us know how is our retention rate. The higher it is, the better we're doing(aka, people are finding our app useful).
What we store
That's it. We don't store any data that's personally identifiable.
Instead, we store a session ID which is a random string. This is used to uniquely identify users.
Between Gumroad and us, we get access to your email address. We use this to inform you of any relevant product updates and communications between us.