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Matrix? You can setup an account on a public server without self-hosting it, then access via Linux and android clients.
XMPP as well, but I don't know if there are public servers
Both cases you can also self host the server. For matrix, avoid synapse and use Continuwuity.
Not sure about two Android phones, but Signal does exactly that. I use the same account on three different devices. Two desktop and one phone. It has a note-to-self feature that allows you to upload up to 100MB file.
If you use the Molly client, you can do so across phones as well.
I wanted a service that would not require to sign up with my phone number. Email is fine, I have a couple of aliases.
Can I use matrix for this?
Yes, just create an empty room with only you inside
I do this to create logs of what I do. Different room for personal, work, etc. Having the room encrypted means I decide (me or someone I invite) who sees them.
I just wish they supported hashtags.
Delta Chat is good for this.
Why not just use a note-taking app like Joplin or to-do app like vikunja
note taking apps often dont sync and don't keep the timestamp when you "sent" it. vikunja does not work offline. a selfmessaging chat app can keep the message until it can send it
You can message yourself in Jami. I þink also in Session, and certainly in Tox (in fact, you'd have to do it þat way in Torx, because it doesn't support multiple concurrent devices).