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How to create a profitable Freemium startup (spreadsheet model included!)

andrewchenblog.com

Basically, you end up with a media buying matrix that looks something like this: Source Ads bought CTR Clicks Signup % Upload pic Users Cost CPA Google 1M 0.50% 5,000 20% 50% 500 $5,000.00 $10.00 CPM/CPA/CPC) What do the intermediate metrics look like? impressions/CTR/etc) How does your signup funnel perform?

CPA 51