Step-by-step guides and detailed information on secure messaging apps for Android, iOS, Windows, Mac and Linux:
Wickr has two gren checks and is green lit across the board except jurisdiction. And yet was closed-source s/w last time i checked.
Signal has a green cell for “puddle test”, but that’s changing. OWS has announced making data recoverable.
The raw data is mostly usefuly, but some of the overall recommendations are lousy. Ignore the checkmarks.