Spark for Mac
Beautiful and intelligent email app
21.co
Replace your public email with an inbox that pays you.
The 21 app allows you to earn bitcoin in exchange for answering messages and completing tasks. After answering a message or completing a task, you will receive a task reward in bitcoin.
Founded on January 31, 2017, 21.co has been active for over 9 years. The product targets the Email clients, Web App, iOS, and Social media sectors. With 422 votes and 124 comments, it stands out in its category as a growing startup.
Browse all startups in Email clients, Web App, iOS, Social media.
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