21.co
Replace your public email with an inbox that pays you.
21.co launched on January 31, 2017 with 689 votes, #9 of 3,671 launches that month and more than 99% of that year's launches.
In plain words
21.co is an iOS app that replaces a public email inbox with one that pays users in bitcoin. Users earn cryptocurrency by answering messages and completing tasks, receiving bitcoin rewards for each completed action. The app combines email management with a task-based earning system, appealing to those interested in Web3 and cryptocurrency.
written from the facts on this page · September 2026
From the sources
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.
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