Calm is one of those companies that seems obvious in hindsight. When they got started in 2012, there were already 20m American who practice meditations and the Semel Institute of Neuroscience and Human Behavior at UCLA had a modestly popular meditation audio-files you could download on your MP3 Player/iPod. But when Alex Tew first came up with the

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Below, co-founders Dylan Diamond and Max Baron share their biggest lessons on building a viral social consumer app, including:

1. Embracing single-player mode as a wedge for social products


2. Building a product that users feel was built just for them


3. Why it’s OK to be unscalable—you can make it scale later


4. Building a familiar product is much easier if

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