Rhombus ◈

The CTF framework for busy hackers

Extensible, lightweight, and feature-rich platform that lets you focus on challenges, not infrastructure.

Host Anywhere

As a single static binary, Rhombus runs on any cloud, in stateful VMs, ephemeral containers, or on a Raspberry Pi. Then choose from multiple options for databases, file uploads, and email.

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Batteries Included

Deeply integrated with Discord, CTFtime, and more to meet your players where they are. Get started with the defaults and incrementally add in features with simple configuration.

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Ticket System

Let users report problems with challenges and continue the conversation in Discord. Authors can provide templates to get higher quality issues with less back-and-forth.

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Open Source

Complete transparency and control over your platform. Contribute new features and bug fixes, or fork and maintain your own version.

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Extendable

Create powerful plugins in Rust to implement custom functionality, and easily share it with others.

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Scalable

Serve 1000s of req/s on a single core and less than 100MB RAM. Give Rhombus more CPU and saturate your network bandwidth.