What is Open CoDesign?
Open CoDesign is an open-source desktop app, from the OpenCoworkAI group, positioned as a local alternative to Claude Design and v0. You describe a landing page, dashboard, mobile app or slide deck; a local agent plans it, writes HTML or React files into a workspace folder, previews them in a sandboxed frame and checks its own work before handing over. You can click an element to leave a comment and have only that region rewritten, or adjust sliders the model exposes for colour, spacing and type.
It works with your own key for Anthropic, OpenAI, Gemini, DeepSeek, OpenRouter, SiliconFlow and others, a ChatGPT subscription sign-in for Codex models, local Ollama, or any OpenAI-compatible gateway, and imports existing Claude Code or Codex provider settings. Exports cover HTML, PDF, PPTX, ZIP, Markdown and, from v0.3.0, PNG.
The repository was created on 18 April 2026, is MIT-licensed and has about 8,100 GitHub stars. v0.3.0 shipped on 31 October 2026. Installers are not yet signed or notarised.
Is Open CoDesign worth it?
Open CoDesign is a serious attempt at a local, model-neutral prompt-to-prototype tool, and its documentation is unusually honest about what it does not do. Each design is a workspace folder and a session log on disk; the agent reads and writes files through permission-gated tools, previews the result, exercises up to 16 scripted interaction steps, and reports which journeys it actually tested. The README says plainly that output is an interactive prototype with simulated data, not a production service, and that its contract tests do not establish visual quality.
The editing loop is the part that saves time. Comment mode rewrites only the element you pin, so a revision does not regenerate the whole page; the tweaks panel binds model-chosen values to the source; and a DESIGN.md file keeps brand tokens as editable text rather than model memory. v0.3.0 added a reusable design-system library, editable PPTX objects, DOCX, PPTX and XLSX attachments read as text, layout and accessibility checks, and a guard that stops a run repeating the same tool call.
The catch is trust and polish. Installers are neither notarised nor Authenticode-signed; on macOS 15 and later the README's fix is to strip the quarantine flag with xattr, and signed builds with auto-update are planned for v0.5. The README still describes v0.2.0 on release day for v0.3.0, the README's WeChat QR code is marked valid only until 16 May, and about 95 issues and pull requests are open. The agent loop is built on Mario Zechner's pi libraries, so the project inherits their direction.
Against Open Design, which drives the coding agent you already run, Open CoDesign is a self-contained app with its own agent and export pipeline: easier for a designer who does not live in a terminal, heavier for a developer who already has Claude Code open. Against Claude Design itself, the trade is the model choice and local files for a less finished interface.
Where it earns its place
A solo founder preparing an investor meeting
Turn a product idea into a clickable prototype and a pitch deck in an afternoon
Pick the pitch-slide and mobile-app demos, describe the product, pin comments on what is wrong, then export PPTX and PDF. With an existing ChatGPT Plus sign-in there is no extra API bill.
A product designer at a 25-person agency
Explore three layout directions for a client dashboard without hand-building each
Keep the client's tokens in DESIGN.md, generate variants, and use the tweaks panel for density and type scale. Decompose to UI Kit emits components and tokens a developer's coding agent can pick up.
A developer at a company that bans cloud design tools for client work
Prototype screens without sending briefs to a third-party design service
Point it at a local Ollama model or an internal OpenAI-compatible gateway; designs and credentials stay on the laptop. Expect weaker results from small local models than from frontier APIs.
Before you commit
- Setup
- brew install --cask opencoworkai/tap/open-codesign, Scoop on Windows, or a DMG, EXE, AppImage, deb or rpm from the release page; add a provider and pick one of fifteen demos. The README puts first artifact at about 3 minutes.
- Integrations
- Anthropic, OpenAI, Gemini, DeepSeek, OpenRouter, SiliconFlow, Atlas Cloud, LiteLLM, Ollama and OpenAI-compatible gateways; one-click import of Claude Code and Codex configs; optional Tavily web research for slides; an agent-native CLI for diagnostics and HTML export.
- Data and privacy
- Credentials sit in ~/.config/open-codesign/config.toml and the app's token store; designs are local workspace folders. Prompts go to the model route you choose. Releases ship SHA256 checksums and a CycloneDX SBOM. MIT licence.
- Cost at scale
- No paid edition. Cost is model tokens per generation, shown per run in the sidebar, or an existing ChatGPT subscription's Codex allowance.
- Limits
- Installers unsigned until the planned v0.5; about 95 open issues and pull requests; preview checks cap at 16 steps; Figma export is listed as post-1.0.
What’s good
- Any model by key, ChatGPT sign-in or local Ollama
- Comment mode rewrites only the pinned element
- Exports HTML, PDF, editable PPTX, ZIP, Markdown and PNG
- Designs live as files in a local workspace
What’s not
- Unsigned installers; macOS needs an xattr workaround
- Prototypes only: simulated data, no real back end
- Fast-moving beta; docs lag releases
- Output quality depends heavily on the model you bring
Best for
Designers, founders and product managers who want prompt-to-prototype on their own machine with a model they already pay for.
Open CoDesign alternatives
Open CoDesign: common questions
- Is Open CoDesign worth it?
- Open CoDesign gives you a credible Claude Design workflow on your own laptop and model, provided you are comfortable running an unsigned beta that changes every release. We rate it 3.7 out of 5.
- How much does Open CoDesign cost?
- Free and open source (MIT). You pay your model provider or use an existing ChatGPT subscription; local Ollama costs nothing.
- What are the downsides of Open CoDesign?
- Unsigned installers; macOS needs an xattr workaround; prototypes only: simulated data, no real back end; fast-moving beta; docs lag releases; output quality depends heavily on the model you bring.
- Who is Open CoDesign best for?
- Designers, founders and product managers who want prompt-to-prototype on their own machine with a model they already pay for.
- How much does Open CoDesign cost for a team or in production?
- No paid edition. Cost is model tokens per generation, shown per run in the sidebar, or an existing ChatGPT subscription's Codex allowance.
- Is Open CoDesign safe for company data?
- Credentials sit in ~/.config/open-codesign/config.toml and the app's token store; designs are local workspace folders. Prompts go to the model route you choose. Releases ship SHA256 checksums and a CycloneDX SBOM. MIT licence.
- What are the best Open CoDesign alternatives?
- The closest alternatives we have reviewed are OpenDesign and Impeccable.
Answers checked Oct 31, 2026.