Highwind vs Emdash
Dev server workspace vs open-source agent app on worktrees
Quick summary
Emdash is a free, Apache-licensed app that runs coding agents in parallel on git worktrees. It detects 35 agent CLIs, starts tasks from issue trackers, and has a diff view, a file editor and pull request tools. It runs on macOS, Windows and Linux.
Highwind is a native Swift app built around the servers a project runs. It restarts crashed servers, starts required services first and starts servers again at launch. It also has a browser with DevTools that agents can use, and iOS and Android device panes.
Choose Emdash for parallel agents on worktrees from your issue tracker. Choose Highwind to run a project’s servers, agents, browser and phone simulator in one Mac window.
Who should choose Highwind, and who should choose Emdash?
Choose Highwind if
- You want dev servers restarted on crash and started in the order they need.
- You want servers running again after a reboot.
- You want agents to use a browser pane with DevTools.
- You build for iOS or Android and want a simulator or emulator pane your agent can use.
- You want a native Mac app rather than Electron.
Choose Emdash if
- You want a free, open-source app.
- You want each agent on its own git worktree, with diffs, commits, PRs and CI checks in the app.
- You want to start tasks from Linear, Jira, GitHub, Notion or Asana.
- You want a file editor with language servers.
- You need Windows or Linux.
Feature comparison
| Feature | Highwind | Emdash |
|---|---|---|
| What it is | A Mac app for dev servers, CLI agents, browsers and phone simulators, grouped by project | An open-source app running coding agents in parallel worktrees |
| Runs your dev servers | Each service has a command, a folder and a port | A run script in project settings starts your app |
| Restarts a server when it crashes | Per service, up to 3 attempts, 2 seconds apart | Not documented |
| Starts the services a server needs first | Starts each required service and waits until its port accepts connections | Setup, then run; no dependencies documented |
| CLI agents from several vendors | Claude Code, Codex, Gemini, OpenCode, Copilot and pi, plus any CLI added with a JSON file | 35 agent CLIs detected automatically |
| Agent conversations resume after a restart | Each agent pane resumes its own session at launch | 26 of 35 agents can continue previous sessions |
| Servers run again after you quit or reboot | Services that were running start again at the next launch, agents resume and browser tabs reopen. Launch at login is optional | With tmux turned on, sessions keep running; a reboot ends them |
| Built-in browser with DevTools | WebKit pane with the Chrome DevTools frontend beside the page | In-app browser; DevTools only in development builds |
| Agents can use the built-in browser | 21 browser tools over MCP, with an approval policy per action | Not documented |
| Phone simulator or emulator in a pane | iOS simulator, Android emulator or Android phone in a pane. No physical iPhones. Needs Xcode tools or the Android SDK installed | Not documented |
| Agents can use the simulator or emulator | 13 device tools over MCP: tap, swipe, type, screenshot, UI tree, logs and crash reports | Not documented |
| MCP server that controls the app | More than 70 tools for services, logs, views, tasks, the browser and devices. Off until you turn it on | Not documented; its docs cover MCP client configuration |
| Shell commands as buttons | Per project, run in their own pane | Not documented |
| Split panes | Views with split panes, layout presets and floating windows | Not documented |
| Task board | Kanban board per workspace that agents can read and update | Pulls issues from Linear, Jira, GitHub, Notion and Asana |
| Git worktrees and diff review | No worktree management or diff view | Worktree per task, diff view, commit, push, PR and CI checks |
| Code editor | Plain text editor and sidebar, no syntax highlighting | File editor with syntax highlighting and language servers |
| Configuration as plain files | Plain files in a .highwind folder | .emdash.json for shared settings; the rest in project settings |
| Built with | Native Swift | Electron (TypeScript), open source (Apache-2.0) |
| No account needed | No account | No account needed for local use |
| Platforms | macOS 14 and later | macOS (Apple silicon, Intel), Windows x64, Linux x64 |
| Price | Free during the public beta | Free; team cloud in version 2.0 is on a waitlist with no price |
“Not documented” means we found no mention of it in Emdash’s documentation.
Dev servers in Emdash and Highwind
Emdash has lifecycle scripts per project: setup prepares the environment and run starts the app. Its documentation doesn’t describe restarting a crashed server or starting one service before another. Highwind restarts a service up to three times, two seconds apart, and starts the services it requires first, waiting until each port accepts connections.
Emdash’s optional tmux mode keeps sessions running, and its documentation says tmux doesn’t keep processes alive through a host reboot. Highwind’s processes stop when you quit, and it starts the services that were running at the next launch, including after a reboot.
Where Emdash is ahead
Emdash is free and open source, runs on three operating systems, detects more agents out of the box, starts tasks from five issue trackers, and has worktrees, a diff view, pull requests, CI checks and a file editor with language servers. Highwind has none of these, runs only on macOS and will charge after the beta.
Frequently asked questions
Is Highwind an Emdash alternative?
For Mac users whose work centres on dev servers, a browser and phone simulators, yes. For parallel agents on worktrees from an issue tracker, Emdash does that and Highwind doesn’t.
Do I need an account for Emdash or Highwind?
No. Emdash’s documentation says you can use it locally without signing in or connecting GitHub. Highwind needs no account.
Try Highwind
A native Mac app for your dev servers, CLI agents and browser panes. Requires macOS 14 or later.
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Last reviewed November 2, 2026. Product features and prices change; tell us on the contact page if something here is out of date.