Freemium is key — but tricky.

Learn how to balance free versus paid features without pissing your users off in our latest interactive VB Live event, where industry leaders will take you for a deep dive into best practices for app monetization.Register here for free.The trickiest part of a successful app launch, says Eric Shashoua, CEO of Kiwi for Gmail, is nailing the pricing structure.

Everyone knows that freemium is often the most lucrative path for productivity and gaming apps — which are also usually the apps with the longest lifetime value for users — but there s a catch, and it s a big one.

The key thing there is that you have to be really careful about that dividing line between what is free and what is paid, Shashoua warns.

If you give people too much on the free side, which is very easy to do, you can t go back from that and roll back those features.

And then you have a very big problem later on to try and add more compelling features when you ve already designed the entirety of the application.

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