I want to install a cross platform (Linux + Android in my case) messaging app on two Android devices and on a Linux desktop. Please suggest one.
- 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. - 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. 
 
 
- 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. 
- 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). 
- Beeper https://www.beeper.com/ Available on all OS 






