•  School of Life is an online development platform focused on helping people lead fulfilled lives. They offer insights on topics ranging from self-knowledge to sociability and work. On Owler, School of Life has an estimated annual revenue of $5 million. There are 685,957 monthly visits to the platform every month and 6.14 million subscribers on Youtube.
• MasterClass, currently valued at $800 million, recently raised $100 million to produce more "celebrity edutainment." The platform provides online video classes with celebrity coaches like Serena Williams and James Patterson. The platform has an estimated annual revenue of $160 million.
• MindValley designs its courses to help unleash the full potentials of individuals, helping them to live "extraordinary, fulfilling, happy lives." The last time the company provided any information on its revenue was in 2014. Its revenue at this time was $20 million. The company claims that its revenue has quadrupled since then. The platform has over 10 million users and 200 authors globally.
• Shift Network was designed to serve the "personal transformational needs" of individuals and empower them. The platform has an estimated revenue of $5.5 million and has served over 1,300,000 users globally.

Summary

• During this research, we determined that it is impossible to provide (i) the market size of the online self-development learning market where the learning content, made available in English, is curated and commissioned rather than uploaded by members/visitors on the platform; and (ii) based on (i), the market size of 18-45-year-olds interested in health, wellness, spirituality, nature, emotional development, and or relationships and sex. This granular information was deemed unavailable in the industry publications and articles found, which focused on the personal development industry in general. We, therefore, decided to focus on providing the estimated revenue and number of users on each platform.
• We could not locate the official website of any company called "Wonderlust" which offers online self-development learning. The webpage of the said company will have to be clarified in the response.
• For HayHouse and Gaia TV, we could not provide the estimated revenue and number of users on each platform. The reason for the absence of this information is that both are subsidiaries of larger companies and have not published their revenue information. Efforts to find the revenue information of both subsidiaries on third party websites such as Owler and DnB also proved abortive.