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Each of @heyhey@twitter.com @ProtonMail@twitter.com @TutanotaTeam@twitter.com @SpikeNowHQ@twitter.com come with their own apps *and* servers. By contrast, Delta Chat apps use the e-mail server of *your* choice and have provider-independent e2e-encryption through https://autocrypt.org - implemented also by other e-mail apps.
@delta I've tried Delta Chat with Vivaldi email and it works.
@delta By the way: @Tutanota is also planning to implement/support Autocrypt: https://github.com/tutao/tutanota/projects/2#column-4291537
To be clear, we welcome these other efforts and startups. They all contribute to a lively e-mail ecosystem. It didn't all end with GMail :) There is a wild variety and diversity around e-mail. But please press for interoperability to avoid lock-in schemes and sustain competition!