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Emdash

Open-source agentic development environment (YC W26): run coding agents like Claude Code and Codex in parallel,

Emdash preview

About

Run agents in parallel, schedule repeat work, preview apps in the built-in browser, and manage prompts, skills, and MCP tools from one place.

Pull from Linear, Jira, GitHub, Notion, Asana, and more. The agent gets full context.

Parallel tasks across separate Git worktrees — each keeps its branch, terminal, conversation, and review state together.

Inspect changes, commit, push, open pull requests, and monitor CI without switching tools.

Features

  • Open-source parallel agent development environment
Pricing
Open Source
Pricing detail
Free open-source ADE
Platforms
macOS, Windows, Linux

Alternatives from our catalog

Tools on the same shelves as Emdash, ordered by shared tags and our own comparisons. Not vendor endorsements.

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  • CrushOpen Source · CLI/TUI (cross-platform terminals)

    HN darling for beautiful TUI UX from the Bubble Tea team; underrated vs Claude Code clones

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  • ClaurstOpen Source · CLI/TUI + ACP editors

    Underrated 2026 Rust Claude Code alternative on HN/GitHub; ACP-ready for Zed and friends

    also in Agents & MCP

  • OpenAI CodexFreemium / plan-tied · CLI + IDE extensions + Codex Web

    Apache-2.0 CLI with ChatGPT plan auth; strong Terminal-Bench showings; cloud+local split (CLI vs chatgpt.com/codex)

    also in Agents & MCP

  • Copilot AgentSubscription · GitHub.com + VS Code agent modes

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