I coded mainly nights and weekends to reach MVP stage. As always there were things I missed out on, and features that I implemented that really didn't need to be there.
I used Firebase and friends as a stack, both as a learning experience and also because it's inexpensive.
I soft-launched Recall Monitor with this feature set and now am working on building traffic and trying to get the first few clicks.
My next steps are to get more into SEO, try to market it through word-of-mouth and get at least 1 subscriber. Let's see how that turns out!