Privacy

This page describes how the Echo project site and related project mail handle information. Echo is an open-source compiled language. xo.run is its public documentation site.

The site

xo.run publishes language documentation, the Echo 2026 spec, install instructions, and an in-browser checker. Modoterra Corporation maintains the site. These pages have no sign-in.

Hosting logs

The site is a static site served from a CDN. The host may record ordinary request data such as IP address, user agent, requested URL, and time. This site does not run a first-party analytics product.

Mail

If you write to hello@modoterra.xyz, security@modoterra.xyz, or oss@modoterra.xyz, we receive the address and message you send so we can reply.

GitHub

Issues, pull requests, and other activity on the public Echo repository are public on GitHub and follow GitHub's terms.

Try Echo

The Try page runs the compiler frontend in your browser. Source you type there stays in that browser session. Playground source is not uploaded to a Modoterra server.

The compiler

xo is a local toolchain. It reads source on the machine where you run it. This site is not a hosted compile service.

Contact

Questions about this page go to hello@modoterra.xyz. Report security issues to security@modoterra.xyz.

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