Nimbalyst: Open-source visual workspace for building with Codex, Claude Code, OpenCode, and other coding agents.

https://github.com/user-attachments/assets/bfd89552-61f4-4db1-8301-cc2495423b89

What you get

• Visual editing of the agent's work. WYSIWYG editors for markdown, mockups, Mermaid, Excalidraw, CSV, data models, and code in Monaco. You and the coding agent edit the same files.
• Red/green diff review. Step through the agent's proposed edits in the rendered document and accept or reject each one.
• Parallel agent sessions. Run several coding agents at once, each isolated in its own git worktree.
• Session kanban. Track every session on a board. Search, resume, and link sessions to the files they touched.
• Task tracking. Plans, bugs, features, and todos in trackers your agents read and update alongside you.
• Heterogeneous agents. Codex and Claude Code side by side, plus OpenCode and GitHub Copilot in alpha and a Gemini provider.
• Git built in. Branch and worktree management, staging, AI-drafted commits, and an embedded terminal.
• MCP client and servers. Connect any MCP server, with tool results rendered as visual widgets rather than raw JSON.
• Extension SDK. Every editor, including the built-in ones, goes through the same EditorHost contract, so an editor you build is first-class. Ask your agent to build one for a file type we do not ship.
• Plain files on disk. Content and status in markdown, workflows in slash commands, everything in your git repo. No proprietary store to migrate out of.
• iOS companion. See which agents need you, reply by text or voice, swipe through diffs, queue the next task, and get a push when an agent is waiting.

Features

Visual Editors: Built-in WYSIWYG editors where you and your coding agents collaborate visually. Approve agent changes as red/green diffs, edit, annotate, and iterate. - Markdown - Mockups with annotations - Mermaid - Excalidraw - CSV - Data Models - Code with Monaco

Session Management: Manage coding agents' work across parallel sessions in a UI - Link sessions to files and files to sessions - Open files in your sessions. Group files touched by a session - Run parallel sessions - Search and resume sessions - Manage in a Kanban board

Task Tracking: Keep track of your plans, bugs, features, todos etc. - Have the agent edit tasks, add them, move them, and execute them - Humans view and edit them too

For Developers - Manage git state - Use AI to git commit - Use the embedded ghostty terminal - Leverage worktrees

Mobile App - Session dashboard: see which agents need you and which are still working - Reply to questions via text or voice, agents resume immediately - Visual diff review: swipe through changes, tap to approve - Queue next tasks: keep the pipeline full, don't let agents sit idle - Push notifications: agents tell you when they need you

Extension System - Pluggable editors for any file type. Every editor (including built-ins) goes through the same EditorHost contract, so custom editors are first-class. - Current extensions include an Astro website editor, visual git log, mindmap, slides, and a 3D object editor.

Supported Coding Agents - Codex - Claude Code - Opencode (alpha) - Copilot (alpha)

Download

Download the latest version for your platform:

Getting Started

1. Create or open a document — click "New" or press Cmd/Ctrl+N
2. Write in markdown — write/edit in the WYSIWYG editor
3. Use the AI assistant — ask AI to research, edit the document, work across your files
4. Accept/reject AI changes — step through suggested AI edits and accept or reject
5. Work in Agent Manager — switch to the agent manager view and run multiple agent sessions in parallel
6. Search/resume sessions — search and resume sessions, manage your work

Auto-Updates

Nimbalyst automatically checks for updates and notifies you when a new version is available. You can also manually check via Help → Check for Updates.

By default, fresh installs are on the stable release channel and only receive promoted releases. If you want early-access builds, switch to the alpha channel under Settings → Advanced → Release Channel. Alpha builds are rougher and may break; revert to stable any time.

Telemetry

Nimbalyst sends anonymous usage analytics to PostHog so we can understand how the app is used and prioritize improvements. We never collect:

• Usernames, emails, or IP addresses (no PII)
• File contents or file paths (categorized buckets only)
• API keys or authentication tokens
• Document, session, or chat content

A randomly-generated anonymous ID is used to correlate events from the same install. You can opt out at any time in Settings → Advanced → Analytics.

For the complete list of every event we send and its properties, see POSTHOG_EVENTS.md. For the privacy rules our analytics code follows, see ANALYTICS_GUIDE.md.

Building from Source

Nimbalyst is a TypeScript / Electron monorepo using pnpm workspaces. It needs Node 24 (see .nvmrc); pnpm is pinned by the packageManager field and provided by corepack.

# One-time: enable corepack (ships with Node 24)
corepack enable

# Install dependencies
pnpm install

# Start the Electron app in dev mode
cd packages/electron && pnpm run dev

# Build a local Mac binary
cd packages/electron && pnpm run build:mac:local

See CONTRIBUTING.md for notes on allowBuilds and the release-age cooldown.

Major workspaces:

• packages/ios — Native iOS app (SwiftUI)
• packages/electron — Desktop application (Electron)
• packages/runtime — Cross-platform runtime services (AI, sync, Lexical editor)
• packages/collab-protocol — Wire-format types for the collaboration sync protocol (shared with the sync server)
• packages/extension-sdk — Extension development kit
• packages/extensions — Built-in extensions

The collaboration sync server (talked to at wss://sync.nimbalyst.com) is a separate project.

For deeper architecture and contributor guidance, see CLAUDE.md and the docs under docs/. For contribution rules and the DCO sign-off requirement, see CONTRIBUTING.md.

Community

• Documentation — watch videos and read the docs
• Discord — join the discussion
• Website — learn more about Nimbalyst

License

• This repository is licensed under the MIT License — see LICENSE.
• The collaboration sync server (the Cloudflare Worker that powers wss://sync.nimbalyst.com) is a separate project. Clients in this repo talk to it over the wire protocol defined in packages/collab-protocol/.
• For licensing context and contact information, see LICENSING.md.

Contributing

• 💡 Have a vague idea or question? → Join the discussion
• 🐛 Found a bug? → Report it in-app with Send Feedback (left rail or Help menu). Your agent helps draft the report, and you approve everything before it goes to GitHub.
• 🗺️ Curious what we're building? → See the roadmap
• 🤝 Want to help with roadmap work? → Community view
• ✨ Have a concrete feature request? → Send it in-app with Send Feedback (left rail or Help menu) and your agent will help draft it.
• 🌱 Looking for a smaller place to start? → Good first issues

We rank features and bugs by 👍 reactions. Don't comment "+1" — react with 👍 instead. Sort issues by reactions →

Acknowledgments

Built with: - Electron - Lexical by Meta - React - Monaco Editor - Excalidraw