What is Cryptgeon used for?

Cryptgeon is a secure note and file sharing service with client-side encryption and in-memory storage, inspired by PrivNote and built with Rust and Svelte. It is a good fit for sharing passwords or secrets that self-destruct, sending files that expire after one view and hosting a private secret-sharing service.

Is Cryptgeon open source?

Yes. Cryptgeon is open source under the MIT licence. Its source code is on GitHub at cupcakearmy/cryptgeon and is written mainly in Svelte.

Yes. Cryptgeon is open source, so the software itself is free to use. A managed cloud version is also available.

Can I self-host Cryptgeon?

Yes. Cryptgeon can be self-hosted on your own server or infrastructure.

What are some alternatives to Cryptgeon?

Similar open-source tools in the Security category include Password Pusher, Cryptomator and VeraCrypt. SaaS products in the same category include ADM Guard, AIBlurWeb and Aura.

Is Cryptgeon actively maintained?

Yes. The most recent commit to Cryptgeon was on 26 September 2026, and the latest release is v2.9.3, published on 25 June 2026. The project has 1.5k stars on GitHub.

Cryptgeon: open-source security

About Cryptgeon

Cryptgeon is an open-source service for sharing secret notes and files, inspired by PrivNote. It includes a server, a web page and a command-line client, and the idea is that you send sensitive text or files through a link that stops working after it has been viewed or after a time limit.

Each note gets a generated id and key. The note is encrypted in the browser with XChaCha20-Poly1305 before it is sent, the id is used to store and retrieve it, and the server never sees the key, so it cannot read the content. Data lives only in memory and is never written to disk. Views and expiry can be limited, dark mode is supported, and a Raycast extension exists.

The backend is written in Rust and the front end in Svelte, and the project is licensed under MIT. You can try the live service on the project website or self-host it, using a Redis or Valkey cache as the store. The README notes that view counts are only guaranteed when running a single instance, which matters for larger deployments.

Key features

Client-side encryption of notes and files
In-memory storage with no disk persistence
View-count and time limits
Web interface and CLI client
Raycast extension
Dark mode support

Good fit for

→Sharing passwords or secrets that self-destruct
→Sending files that expire after one view
→Hosting a private secret-sharing service

Built with: Svelte
Tags: secure-notes; file-sharing; encryption; privnote; rust; svelte; self-destruct; privacy; self-hosted

Cryptgeon: questions and answers

What is Cryptgeon used for?: Cryptgeon is a secure note and file sharing service with client-side encryption and in-memory storage, inspired by PrivNote and built with Rust and Svelte. It is a good fit for sharing passwords or secrets that self-destruct, sending files that expire after one view and hosting a private secret-sharing service.
Is Cryptgeon open source?: Yes. Cryptgeon is open source under the MIT licence. Its source code is on GitHub at cupcakearmy/cryptgeon and is written mainly in Svelte.
Is Cryptgeon free?: Yes. Cryptgeon is open source, so the software itself is free to use. A managed cloud version is also available.
Can I self-host Cryptgeon?: Yes. Cryptgeon can be self-hosted on your own server or infrastructure.
What are some alternatives to Cryptgeon?: Similar open-source tools in the Security category include Password Pusher, Cryptomator and VeraCrypt. SaaS products in the same category include ADM Guard, AIBlurWeb and Aura.
Is Cryptgeon actively maintained?: Yes. The most recent commit to Cryptgeon was on 26 September 2026, and the latest release is v2.9.3, published on 25 June 2026. The project has 1.5k stars on GitHub.