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How we built an easy date picker to solve our problems, and reached more than a million people from all over the world in the process.

About 4 years ago, we started working on LouLou; a simple app to plan events directly in WhatsApp. Last month we reached a million users, so we figured this was a good a time to write about how we got to this milestone!

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In early 2013, my colleague Jurriaan and I were brainstorming during one of our regular Innovation-team meetings at Triple. We were thinking of small app ideas that could help Jurriaan expand his iOS development skills. However, we didn’t want to create something that would be of little use in the real world.

A few weeks before I became annoyed that every time my friends and I wanted to meet up, our shared WhatsApp group would burst into an unstructured message overload. Jurriaan and I set out to fix this problem by creating LouLou; a simple date picker directly connected to WhatsApp. …

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