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I built (but never released) a project for this: an end-to-end encrypted "slow" chat app, where you'd send long-form rich-text letters to friends and they'd take a configurable amount of time to deliver, backed either just by client business logic or optionally with timelock encryption (this one [1], not this one [2]).

I've been meaning to clean it up and open source it.

[1] https://eprint.iacr.org/2023/189

[2] https://people.csail.mit.edu/rivest/pubs/RSW96.pdf

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There is an app called Slowly [0] that kind of does that, you send open letters and people can respond to you. They take time to arrive, the longer you physically are from each other, the longer they take.

I've found it very cool, got a few responses to my open letter and responded to some letters. People were cool and writing long form stuff is great. Unfortunately I struggle to have a long term relationship through this, I feel too shallow. But the experience has been great.

[0] https://slowly.app/

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