Castlefile is described as 'CastleFile is an innovative file encryption tool that uses chess moves as unique keys for secure, client-side file encryption. It uses the SHA-256 hashing algorithm and AES encryption to ensure top-notch data protection, combining chess with cryptography' and is a file encryption software in the security & privacy category. There are more than 25 alternatives to Castlefile, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Castlefile alternative is VeraCrypt, which is both free and Open Source. Other great sites and apps similar to Castlefile are Cryptomator, TrueCrypt, Picocrypt and LUKS.