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Memi Lavileft a comment
I would suggest looking at it the other way around: Define what's the conversion rate you want to see, and work from there. The Freemium model is always a trade-off: Collecting users vs making income. The balance dictates the conversion rate. I'm currently thinking about the exact same question for a product I'm working on, and this is how I try to think of it: When considering the free/paid...
How do you decide what features should be free and what should be paid?