gpg4o is described as 'OpenPGP Plugin for Outlook 2010/13/16' and is an app in the office & productivity category. There are three alternatives to gpg4o for a variety of platforms, including Windows, Linux, Android, Flathub and Microsoft Outlook apps. The best gpg4o alternative is GPG4Win, which is both free and Open Source. Other great apps like gpg4o are Lock GnuPG and RotorCrypt X.
Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.
Native Windows encryption app combining Rotor logic, AES-256-GCM and Perfect Forward Secrecy — offline, no account needed.
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