Mega

Filen

Filen is a German cloud storage provider built around AES 256-bit client-side encryption and a zero-knowledge architecture, meaning the company itself cannot read stored files. Alongside standard file sync and storage, it offers a network drive that mounts cloud storage as a local drive, encrypted notes with markdown support, and end-to-end encrypted chat. Filen's applications are open source, and the service supports WebDAV and S3 protocols along with a headless CLI for developers and automation. It is positioned as a security-focused alternative for individuals and small teams who want full encryption without losing everyday usability.

NordLocker

NordLocker provides end-to-end encrypted cloud storage using AES-256, xChaCha20-Poly1305, and Ed25519 algorithms, built on a zero-knowledge architecture so the company itself cannot access stored files. It functions as both a local encrypted vault and a syncing cloud drive, letting users secure files locally and back them up to the cloud simultaneously.

SpiderOak One

SpiderOak One is a secure cloud backup and file sharing service designed to prioritize user privacy through a zero-knowledge encryption architecture. This means that encryption keys are derived entirely from your master password, ensuring that no one other than you—not even SpiderOak employees—can access your stored data. The platform provides robust file versioning, automated background backups, and easy sharing capabilities across multiple operating systems. It is engineered for individuals and businesses seeking a high-security alternative to mainstream cloud storage providers without sacrificing convenience or reliability.

Tresorit

Tresorit is a cloud storage solution designed for businesses that require high levels of security and data protection. It uses zero-knowledge encryption, which ensures that only the user has access to the data, and not even Tresorit's employees can access it. This makes it an ideal solution for businesses that handle sensitive data, such as financial information, personal data, or confidential documents.

Sync.com

Sync.com provides end-to-end encrypted cloud storage that keeps your files private while allowing seamless syncing across devices. Its zero-knowledge architecture ensures only you can access your data, making it ideal for individuals and teams that prioritize security. The service includes collaboration tools such as shared folders, link permissions, and real-time file versioning, all accessible via web, desktop, and mobile apps. Sync.com offers a free tier with limited storage and paid subscription plans for expanded capacity and advanced admin controls.