Check:
https://securemessagingapps.com
and rate the security
🟩=3 🟨=1 🟥=0
Results:
1. Threema = 85
2. Session = 79
3. Signal = 77
4. Wickr (Amazon) = 62
5. Element / Matrix = 59
6. WhatsApp = 34
7. Telegram = 29
8. Apple iMessage = 25
9. Facebook Messenger = 25
Threema over 11 Mio. (clever) Users
Does not need a phone number (like Signal a.o.)
Threema does not store metadata and IPs
Threema can be purchased wiht Bitcoins and costs only a one-time amout of $5
Read more at: https://www.Threema.ch/en