Calendly grew from an MVP product in 2013 to a company now valued at $3 billion. Early on, the company struggled to maintain a unique value proposition in a crowded market, monetize its users without harming customer satisfaction, and find the right level of customization to offer to users in different segments. Ultimately Calendly succeeded due to its freemium model, which helped spread organic word-of-mouth, as well as its personalized marketing to keep users engaged. Some of its successful marketing initiatives include webinars and educational content, discount code campaigns via Google Ads, and enabling its customers to embed Calendly in their own ads.

As businesses mature, market shifts, internal pivots, and competitive pressures can lead to growth stalls. The 3P framework guides companies through three stages: Problem Market Fit, where companies focus on solving a critical customer problem; Product Market Fit, where they narrow their efforts to selling one product to a specific audience; and Platform Market Fit, where they expand their offerings to existing customers through multiple products and GTM motions.