Show HN: Horizon – GPU-accelerated infinite-canvas terminal in Rust

Tabs, splits, and tmux work fine until you have several projects open with logs, tests, and long-running shells. I kept rebuilding context instead of resuming work. Horizon puts shells on an infinite canvas. You can arrange them into workspaces and reopen later with layout, scrollback, and history intact.

Built in 3 days with Claude/Codex, dogfooding the workflow as I went. Feedback and contributions welcome.

Spatial memory is really underutilised in computing.

When libghostty[0] releases maybe you could use that so you don't have to build everything from scratch.

[0]: https://mitchellh.com/writing/libghostty-is-coming

This is great! Two things I noticed immediately:

the settings window overlaps with the minimap.

I think it'd be neat if you could zoom? The reason I'd use this over a tiling window manager is to fit more terminals on a screen at once. I think if there was a capability like the Strategic Zoom in Supreme Commander (video: https://www.youtube.com/watch?v=9hJY7exr9KU) it would be much easier to manage many terminals at once, and take advantage of the infinite canvas.

This is fun! I switched to https://github.com/manaflow-ai/cmux for a while, but had to switch back to Ghostty due to its unreliability, high memory and CPU usage and a bunch of bugs.

This makes a lot of sense, but... it'd be great to allow pulling out of a canvas into a second canvas for those of us with multiple screens (you at least end up needing one window per screen).

In general it feels like... more structure rather than less feels like it'd be the smoothest experience. I'll play with your Ctrl+K shortcut and see if it ends up feeling like I can get everywhere that I need quickly.

But... nice work!

Note for jj users like me: you need to `git lfs pull` if you want to `cargo run --release`!

Update: No luck creating any 'shell' workspaces (it looks like you use GNU-only flags to script) – I'll push a fix once I find it.

Also: the AGENTS.md is wrong JFYI - it points to portable-pty, when this is using alacritty_terminal's tty (on rustix-openpty)

Will there be any built releases available?

Maybe I’m old but this sounds like MDI (multiple-document interface) of the late 90s.

Went the way of the dodo probably because it’s hard for non power users to grok.

But this is a power user tool - seeems like a fit!

I think MDI style interfaces went out of fashion because there were a lot of programs that implemented an entire window manager and then only really needed one window. This added a ton of complexity that wasn't needed most of the time, because window management is really a job for a different program.

I was hoping this would be an infinite length terminal view, like the opening backstory in Star Wars