Which spiritual wellness app first pioneered the 'freemium' subscription model that has now become standard in meditation and mindfulness applications?

In today's digital age, religious organizations and spiritual services have adapted various subscription models to engage their communities and sustain their missions. From meditation apps to online religious education, subscription-based spiritual services have become increasingly popular. This poll tests your knowledge about how subscription models are being utilized in the religion and philosophy sector.

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Headspace, founded by former Buddhist monk Andy Puddicombe in 2010
Calm, launched by Michael Acton Smith and Alex Tew in 2012
Insight Timer, created by Christopher Plowman in 2009
Ten Percent Happier, developed by journalist Dan Harris in 2014