S2S is described as 'Free iPhone/iPad app that enables you to not only encrypt files and store them in Dropbox, but also to share these encrypted files with your friends without disclosing your encryption password' and is an app in the file sharing category. There are nine alternatives to S2S for a variety of platforms, including Windows, Mac, Android, iPhone and Linux apps. The best S2S alternative is Encrypto, which is free. Other great apps like S2S are Boxcryptor, S.S.E. File Encryptor, SecurStick and Unicode Crypter.
Encrypto lets you encrypt files before sending them to friends or coworkers. Just drop a file into Encrypto, set a password, and then send it however you normally would — but this time with added security. It’s free for both Mac and Windows.
Encrypto is the most popular Windows & Mac alternative to S2S.
Encrypto is the most popular free alternative to S2S.
Boxcryptor is an easy-to-use encryption software optimized for the cloud. It allows the secure use of cloud storage services without sacrificing comfort.
Boxcryptor is the most popular Android, iPhone, iPad & Android Tablet alternative to S2S.
S.S.E. File Encryptor is a cross-platform encrypter/decrypter of files and folders.
S.S.E. File Encryptor is the most popular Linux alternative to S2S.
S.S.E. File Encryptor is the most popular Open Source alternative to S2S.
SecurStick is a free portable application that lets you carry encrypted files on your USB drive. You can use the drive on any computer to access and modify those files WITHOUT needing any administrator privileges.
Unicode Crypter is a portable tool that encrypts and decrypts any Unicode character from 1 to 1114111!
Perfecto Encryptor will encrypt your data fast and securely! This unique program will help you to keep any of your files and folders in encrypted form. And only you will can decrypt your files.
Perfecto Encryptor is the most popular commercial alternative to S2S.
Encrypts and protects your files on your machine, before they hit your disk and the cloud: Collaborate with others, end to end encrypted.
nCrypted Cloud is a Privacy, Security, and Collaboration solution that gives users full control over their personal and corporate Dropbox data. nCrypted Cloud adds client side encryption to your Dropbox existing data, and does not require you to migrate or move your files.
nCrypted Cloud is the most popular Web-based alternative to S2S.
DigiVault is a portable, file-based encryption software for Windows. It helps you create and manage encrypted file containers or repositories for storing confidential files. Repository files are not bound to its storage device, making it portable.
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