Your Files. Your Cloud.
Your Rules.
An open source, privacy-first cloud file sync service.
Self-host for free, or let us handle the infrastructure.
Cloud storage you can actually trust
No black boxes. No data mining. No surprises in the terms of service. Every security claim is verifiable in the source code.
Zero-Knowledge Architecture
Files are encrypted client-side before upload. The server never sees your encryption keys or plaintext data.
Your Infrastructure, Your Rules
Deploy on your own servers with Docker. S3-compatible storage backends. PostgreSQL database. No vendor lock-in.
Auditable Codebase
Every line of the server and client is open source under the MIT license. Verify the security claims yourself.
Modular by design
Citadel is split into an open-source server and client core, each independently deployable and auditable. Plug in your own S3-compatible storage, use your own PostgreSQL database, run it anywhere.
Fastify API with pluggable storage backends
TypeScript + Rust acceleration for native performance
Optional managed hosting, same privacy guarantees
Take back control of your files
Citadel is free, open source, and built for people who believe their data should remain their own. Get started today.