Any opinions on an IM solution to send notifications to?

Something which can show push notifications on my phone would be ideal.

This is for my personal stuff which isn't critical or public. I would like E2EE if for no other reason then why not.

Top options:

• Matrix
• XMPP

Middle:

• Jami (No API?)
• Zulip (no EE2E)
• Google Chat (no EE2E?, dealing with Google APIs)

No:

• Briar (no iOS client)
• Signal (no API)
• Session (no API)
• Whatsapp (API cost)
• Threema (cost)
• Wire (bot API in beta, cost?)
• Telegram (sus)
• Slack