The best Cloud Storage alternative to Boxcryptor is Cryptomator, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Boxcryptor and eight of them are Cloud Storage Services so hopefully you can find a suitable replacement. Other interesting Cloud Storage Service alternatives to Boxcryptor are Tresorit, Internxt Drive, Cryptsync and ODrive.
Cryptomator provides transparent, client-side encryption for your cloud. Protect your documents from unauthorized access. Cryptomator is free and open source software, so you can rest assured there are no backdoors.
End-to-end encrypted file synchronization and sharing on desktop and mobile, featuring admin controls, auditing, link-based sharing, two-factor authentication, offline access, granular permission management, and protection for sensitive workplace documents.
Open-source, privacy-focused cloud storage using zero-knowledge encryption and blockchain technology, provides secure file transfer, end-to-end encryption, free 10 GB plan, desktop and mobile support, full user control, and no data tracking or ads.
CryptSync is a small utility that synchronizes two folders while encrypting the contents in one folder. That means one of the two folders has all files unencrypted (the files you work with) and the other folder has all the files encrypted.
Crococrypt is an encryption tool which mirrors complete folders to encrypted folders. The encryption algorithms that are used are AES and Twofish (256 bits, cascading). The keyfile is secured by a password using PKCS #5 (PBKDF2) with a SHA512/Whirlpool based HMAC using 100000...
S2S is a 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.
Edelcloud is a secure cloud storage where you can store your personal files and access them from anywhere!
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Boxcryptor is proprietary and costs money. Cryptomator is open source (you can check that it's implemented correctly) and it is free. Moreover, it works on Linux, which Boxcryptor does not. Cryptomator is excellent and basically a Boxcryptor killer. Mobile versions are in beta/soon ready.