Freemium Summit: Evernote shares the insider secrets of free apps | VentureBeat
At first, the cohort from March, 2009, didn’t spend any money. In the first month, Evernote made about $300, meaning about 60 of the original 31,334 users decided to subscribe on the spot. But the longer people used it, the more likely they were to subscribe.
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Interesting numbers from Evernote. Despite petty $300 of income in the first month, Evernote's strength lies in the fact that its value to the users increases as they put more content in the app. Therefore they also more likely to pay for premium features.
