Feel Safe Again

Most people don't care about privacy. We do. Zero Knowledge cloud solutions for collaboration and backup.

Discover Semaphor SpiderOakONE Backup

For over ten years spideroak has been committed to Zero Knowledge solutions for people and teams that care about privacy.

Download a free trial of our backup, password, or collaboration tools.

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Zero Knowledge

Our systems have Zero Knowledge of your data. In non-technical terms it means that your data is 100% private and only readable by you. No plaintext data, no keys, or file meta data is ever stored on our servers. All this ensures absolute confidentiality of your data.

10 Years of Privacy

We've been the leader in privacy solutions for users just like you since before most people started worrying about online privacy. And we plan to keep true to our principles long into the future. Read more on our blog.

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Something to Protect

Privacy online seems to get a bad rap. We're told, "the only people who care about privacy are those who have something to hide." Well, we emphatically disagree. The notion we should not care about privacy is largely promoted by companies who depend on you being their product. It's not about what people want to hide, it's really about being able to choose that your life's work is worth protecting.

Real-time Collaboration

Secure, private communications for ideas that matter. Protect them with Semaphor, the world's first Zero Knowledge collaboration tool.


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Private Backup

SpiderOakONE is the leading private backup solution and is 100% Zero Knowledge. Get a ton of space for only $12 a month. Groups and enterprise solutions available.


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