HackerReposA FIELD GUIDE TO OPEN SOURCE
ProSponsor the shelf♧ 0
← Back to top all-time
manaflow-ai
cmux
Swift2025–2026
manaflow-ai / cmux

cmux

Open source Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents. Built for multitasking, organization, and programmability.

Command LineAI & Machine LearningMobile & DesktopCommunication & Social
Explore on GitHubRead Hacker News discussions
8Distinct people
17Mentions
0Explicit recommenders
28.8KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Open source Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents. Built for multitasking, organization, and programmability.

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by month17 dated mentions

Observed mentions: 2025-10-30 14:21:58 UTC to 2026-08-07 10:05:19 UTC.

02462025-10-01 00:00:00 UTC to 2025-11-01 00:00:00 UTC (exclusive): 6 mentions; 1 submissions, 5 commentsOct 20252025-11-01 00:00:00 UTC to 2025-12-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-12-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-01-01 00:00:00 UTC to 2026-02-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-02-01 00:00:00 UTC to 2026-03-01 00:00:00 UTC (exclusive): 5 mentions; 1 submissions, 4 comments2026-03-01 00:00:00 UTC to 2026-04-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 commentsMar 20262026-04-01 00:00:00 UTC to 2026-05-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-05-01 00:00:00 UTC to 2026-06-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-06-01 00:00:00 UTC to 2026-07-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-07-01 00:00:00 UTC to 2026-08-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2026-08-01 00:00:00 UTC to 2026-09-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 commentsAug 2026

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
Oct 20252025-10-01 00:00:00 UTC2025-11-01 00:00:00 UTC615
Nov 20252025-11-01 00:00:00 UTC2025-12-01 00:00:00 UTC101
Dec 20252025-12-01 00:00:00 UTC2026-01-01 00:00:00 UTC000
Jan 20262026-01-01 00:00:00 UTC2026-02-01 00:00:00 UTC000
Feb 20262026-02-01 00:00:00 UTC2026-03-01 00:00:00 UTC514
Mar 20262026-03-01 00:00:00 UTC2026-04-01 00:00:00 UTC303
Apr 20262026-04-01 00:00:00 UTC2026-05-01 00:00:00 UTC000
May 20262026-05-01 00:00:00 UTC2026-06-01 00:00:00 UTC000
Jun 20262026-06-01 00:00:00 UTC2026-07-01 00:00:00 UTC000
Jul 20262026-07-01 00:00:00 UTC2026-08-01 00:00:00 UTC101
Aug 20262026-08-01 00:00:00 UTC2026-09-01 00:00:00 UTC101

What Hacker News says

17 sources
pecheny·Aug 7, 2026
Oh wow :) thank you for cmux, it's a great project! The code is here: https://code.pecheny.me/pecheny/cmux or if you prefer github, https://github.com/alexander-pecheny/cmux I think I only added two features, pasting images over mosh (ssh already worked but not mosh) and a compact version of sidebar. The story behind the fork is: I had a bug with raycast, filed a PR that fixed it for me https://github.com/manaflow-ai/cmux/pull/2435, a different fix made it into next release that for me didn't work. Maybe the problem was on my side, but at this point it was easier to fork the working version than debug further.
In Herdr is joining Y Combinator. The runtime stays open
tekacs·Mar 17, 2026
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 AGENT
Read the rest
S.md is wrong JFYI - it points to portable-pty, when this is using alacritty_terminal's tty (on rustix-openpty)
In Show HN: Horizon – GPU-accelerated infinite-canvas terminal in Rust
lawrencechen·Feb 20, 2026
Thanks for the feedback! Mitchell Hashimoto is awesome. Have a PR for fixing devtools here: https://github.com/manaflow-ai/cmux/pull/117 > hotkey overrides - I have some things explicitly unmapped / remapped in my ghostty config that conflict with some cmux keybindings and weren't respected We need to be better about this; right now you can modify keyboard shorcuts with cmd+, in the GUI. Planning on making it a config file in the spirit of ghostty though, not sure if we want to reuse ghostty's config file though since it might become a maintenance burden for them... > command palette (cmd-shift-p) for less-often-used actions + discoverability yes > cmd-z to "zoom in" to a pane is enormously useful imo Thinking of the right way to design this. Like hypothetically we can expand it, but what happens if you make a vertical/horizontal split, o
Read the rest
r cmd+t to make a new tab? I guess we could just "merge" it back into the original space which would be pretty cool.
In Show HN: cmux - Ghostty-based terminal with vertical tabs and notifications
lawrencechen·Feb 19, 2026Submission

Show HN: cmux - Ghostty-based terminal with vertical tabs and notifications

I run a lot of Claude Code and Codex sessions in parallel. I was using Ghostty with a bunch of split panes, and relying on native macOS notifications to know when an agent needed me. But Claude Code's notification body is always just "Claude is waiting for your input" with no context, and with enough tabs open, I couldn't even read the titles anymore. I tried a few coding orchestrators but most of them were Electron/Tauri apps and the performance bugged me. I also just prefer the terminal since GUI orchestrators lock you into their workflow. So I built cmux as a native macOS app in Swift/AppKit. It uses libghostty for terminal rendering and reads your existing Ghostty config for themes, fonts, colors, and more. The main additions are the sidebar and notification system. The sidebar has vertical tabs that show git branch, working directory
Read the rest
, listening ports, and the latest notification text for each workspace. The notification system picks up terminal sequences (OSC 9/99/777) and has a CLI (cmux notify) you can wire into agent hooks for Claude Code, OpenCode, etc. When an agent is waiting, its pane gets a blue ring and the tab lights up in the sidebar, so I can tell which one needs me across splits and tabs. Cmd+Shift+U jumps to the most recent unread. The in-app browser has a scriptable API ported from agent-browser [1]. Agents can snapshot the accessibility tree, get element refs, click, fill forms, evaluate JS, and read console logs. You can split a browser pane next to your terminal and have Claude Code interact with your dev server directly. Everything is scriptable through the CLI and socket API – create workspaces/tabs, split panes, send keystrokes, open URLs in the browser. Demo video: https://www.youtube.com/watch?v=i-WxO5YUTOs Repo (AGPL): https://github.com/manaflow-ai/cmux [1] https://github.com/vercel-labs/agent-browser
198 points · Open discussion
lawrencechen·Oct 30, 2025
Public repos shouldn't require being signed in. Just tested these example links in incognito and seemed to work? https://0github.com/manaflow-ai/cmux/pull/666 https://0github.com/stack-auth/stack-auth/pull/988 https://0github.com/tinygrad/tinygrad/pull/12995 https://0github.com/simonw/datasette/pull/2548 > you've disabled logging issues on the repo Sorry, wasn't aware. Turning it on right now. EDIT: https://github.com/manaflow-ai/cmux/issues seems to be fine?
In Show HN: I made a heatmap diff viewer for code reviews
lawrencechen·Oct 30, 2025
Yeah, heatmapping the diff before creating a PR would need tighter IDE integration. We're working on cmux for this purpose. It's kinda an IDE, and it lives in the same repo: https://github.com/manaflow-ai/cmux. After we add the heatmap diff viewer into cmux, I expect that I'll be spending most of my time in between the heatmap diff and a browser preview: https://github.com/manaflow-ai/cmux/raw/main/docs/assets/cmu...
In Show HN: I made a heatmap diff viewer for code reviews
lawrencechen·Oct 30, 2025
Happy to hear! > Is this using some sort of measure of distance between the expected token in this position vs the actual token? The main implementation is in this file: https://github.com/manaflow-ai/cmux/blob/main/apps/www/lib/s... EDIT: yeah it's just a LLM prompt haha Just a simple prompt right now, but I think we could try an approach where we directly see which tokens might be hallucinated. Gonna try to find the paper for this idea. Might be kinda analogous to the "distance between the expected token in this position vs the actual token."
In Show HN: I made a heatmap diff viewer for code reviews

Showing the 15 most recent of 17 sources. Enable JavaScript to search and browse every indexed mention.

MAKE YOURSELF AT HOME

A few shortcuts

/
Search the collection
?
Open this guide
Esc
Close dialogs and navigation

Your saved repositories and interests stay in this browser.