Apps like Tessercube

Here are some great alternatives to Tessercube by Dimension HQ :
OpenKeychain: Easy PGP
OpenKeychain: Easy PGP
★4.0
K-9 Mail
K-9 Mail
★3.4
Conversations (Jabber / XMPP)
Conversations (Jabber / XMPP)
★4.1
Android System Key Verifier
Android System Key Verifier
★3.6
Privacy Keyboard : Secure text
Privacy Keyboard : Secure text
★4.0
Enigma Machine
Enigma Machine
★4.4
Biocoded
Biocoded
★3.5
aTalk (Jabber / XMPP)
aTalk (Jabber / XMPP)
★4.1
RubyGram
RubyGram
★4.7
Cryptool
Cryptool
★4.3
ArmorText
ArmorText
★4.3
Messenger - SMS Short Messages
Messenger - SMS Short Messages
★4.4
Amharic Keyboard
Amharic Keyboard
★3.7
Bluegram | بلوگرام بدون فیلتر
Bluegram | بلوگرام بدون فیلتر
★4.5
Mopogram
Mopogram
★4.6
TG Connect
TG Connect
★3.3