Boltin-browser projectriviera-appbrowser project, deployableStylingper-project, in the sandboxEdit: calmer headlineone more message, more tokens
Bolt 
OpenDesign Open-Source Bolt Alternative for the Design Layer: OpenDesign
OpenDesign is a free, open-source, local-first Bolt alternative for one part of what bolt.new does: the interface. Your own coding agent renders it from a brief and a portable DESIGN.md, and every version is a file in your repo. Bolt keeps the in-browser runtime and deployment. This page says who maintains the exported code, what stays in Bolt, and how to run both.
Verdict, by task04 / Bolt
OpenDesign vs Bolt, three different needs
Start in the Right Place
This page · choosing
OpenDesign or Bolt?
A verdict by situation, one brief run in both tools, a dated feature comparison and the conditions that flip the answer.
Read the verdict Already on BoltKeep the App, Own the Front End
What migrates from a Bolt project, what stays in the browser runtime, and the four steps to iterate the UI as files.
See what moves A different questionShortlisting App Builders?
Lovable, v0, Replit and the OpenBolt fork are compared in the Bolt alternatives roundup; this page is one-to-one.
Read the Bolt alternatives roundupOn this page Overview
What each one is
Bolt vs OpenDesign: What Each Tool Is
Bolt and OpenDesign overlap on prompt-to-UI, not on running the result. Bolt's job is a full-stack app booted in the browser; OpenDesign's job is the design layer as files. OpenDesign writes this comparison about its own product and is not affiliated with StackBlitz.
Short answer. OpenDesign is a free, open-source (Apache-2.0), local-first Bolt alternative for the interface: your coding agent renders and revises UI from a brief and a portable DESIGN.md, saved as files in your repo. It does not boot a dev environment, scaffold a backend or deploy; if a running full-stack app in the browser is the goal, keep Bolt.
Bolt
Bolt (bolt.new, from StackBlitz) is a hosted AI app builder that runs in the browser: describe a product and it generates and runs a full-stack web app you can deploy, with the dev environment in the browser tab. It is genuinely fast from prompt to a running app.
- RunsIn-browser dev environment, vendor cloud
- AgentVendor-managed models
- OutputA running app, plus code export
- CostSubscription plus per-token creditstiers not verified here
OpenDesign
OpenDesign is a local-first, open-source design agent you point your own coding agent at. Skills and a portable brand live as files in your repo; the desktop app renders and reviews the result.
- RunsDesktop app and local daemon on your machine
- AgentYours: Claude Code, Codex, Cursor, Gemini, OpenCode, Qwen and more
- OutputFiles in your project directory
- CostApache-2.0; you pay your own provider for API usage
Where they overlap
Prompt to interface and the front-end code behind it. That is the only part of Bolt the rest of the page compares OpenDesign with.
What this page does not claim
That OpenDesign runs your app, scaffolds a backend or deploys it, or that switching is free of loss. If instant runtime matters more than owning the design files, the verdict below says keep Bolt.
Verdict
Bolt or OpenDesign? The Verdict by Situation
Pick Bolt if…
- You want a running full-stack app from a prompt, in the browser, with zero setup.
- You want to deploy straight from the same hosted environment.
- You prefer a hosted UI and per-token credits over local files and your own key.
Pick OpenDesign if…
- You want the interface and the brand as version-controlled files next to the code.
- You want to bring your own key and keep the coding agent you already use.
- You want open source you can fork, rebrand, drive from a CLI or self-host.
- You want one DESIGN.md per brand that every skill respects without re-prompting.
Run both if…
- The app already runs in Bolt and only the front end needs a real design pass.
- You export Bolt's code anyway and want the design system to live with it.
- Designers want reviewable files; engineers still want Bolt's instant runtime.
Same brief, two results
The Same Brief in Bolt and OpenDesign
A comparison is only as honest as its inputs. The same brief and the same brand go into Bolt and into OpenDesign; what comes back, how it is edited and where it ends up is what you compare. The panels below are illustrations, not screenshots; the 20-minute test lets you run the brief yourself.
Brief · identical in both tools
Design a landing page for a small studio that books slow-travel stays. One hero with a strong headline, three featured places, a short note on how booking works, and a final call to action. Desktop and phone.
- Brand
- Paper background, Albert Sans, one green accent, 8px radius
- Breakpoints
- 1440 desktop, 390 mobile; no horizontal scroll
- Edit test
- After the first result: "make the headline calmer, swap the second place"
- Record
- Model, date, time to first result, edits needed, export format
Boltin-browser projectOpenDesign + your agentfiles in the reporiviera-landing.htmlnew · v2DESIGN.mdboundEdit: calmer headlinepoint at the element, agent revises
IllustrativeBoth panels are illustrations drawn for this page, not screenshots of either tool, and the verdict does not rest on them. Run the brief yourself with the 20-minute test below and note the points listed here so the two results can be compared fairly.
What to note · both tools
Model and version, run date, time to first usable result, number of edits to reach "done", what the export contained.
What to note · Bolt
Plan and tokens spent, whether styling persisted to a second page, what the code export contained, what still needed the browser sandbox.
What to note · OpenDesign
Agent and key used, whether DESIGN.md was respected without re-prompting, both breakpoints checked, versions kept as files.
Feature by feature
OpenDesign vs Bolt, Feature by Feature
Nine dimensions where OpenDesign and Bolt differ in practice: primary job, license, runtime, agent, cost, design system, ownership, self-hosting and automation. Bolt facts were checked against public sources on 2026-09-06; plan prices are deliberately not stated.
| Dimension | OpenDesign | Bolt |
|---|---|---|
| Primary job | Design artifacts and a portable brand | Prompt to running full-stack app |
| License | Apache-2.0, full source on GitHub | Closed-source, hosted product |
| Runtime | Desktop app and local daemon on your machine | In-browser sandbox, vendor cloud |
| Agent | Bring your own: Claude Code, Codex, Cursor, Gemini, OpenCode, Qwen and others | Vendor-managed models |
| API spend | Bills to your own provider account | Per-token credits on top of a subscriptiontiers not verified |
| Design system | Portable DESIGN.md in your repo, respected by every skill | Per-project styling |
| Artifact ownership | Files in your project directory, versioned with your code | Hosted project; code export available |
| Self-host | Yes; runs anywhere Node 24 runs | No (the OpenBolt / bolt.diy fork is a separate project) |
| CLI / CI | Yes, via the od CLI and HTTP daemon | Web UI first |
Where Bolt wins
An instant, running full-stack app in the browser with the dev environment wired for you. If that is the goal, Bolt does it out of the box and OpenDesign does not.
Where OpenDesign wins
The design layer as files you maintain, produced by the agent you already pay for, with a brand that survives the next project and nothing you cannot fork.
Decision
When OpenDesign Is the Right Bolt Alternative
Prototype by tonight
A working app in the browser, shown to a customer tomorrow
BoltThe instant runtime is the feature. Adding a desktop app and a repo to that deadline is a cost this page will not pretend away.
Not a fit when the same prototype needs a consistent brand across five more screens.
Team maintaining exported code
Bolt's export is now a real codebase
Run bothExtract the brand into DESIGN.md and let your agent iterate the front end as files in that repo; keep Bolt for quick spikes of new features.
Not a fit when nobody wants to leave the browser sandbox.
Engineer with a backend
The API exists; the interface is the missing half
OpenDesignBrief the agent with the brand and the API shape; the interface lands in your repo as code, reviewed at both breakpoints.
Not a fit when you also want the tool to scaffold and host the backend.
Design-heavy product
Ten screens that must look like one product
OpenDesignOne DESIGN.md; every screen, deck and dashboard renders in it without re-prompting. See the design system solution.
Not a fit when the screens are throwaway and the runtime is what you are testing.
Move a design across, or run both
How to Move a Design from Bolt to OpenDesign
There is no automatic import from Bolt into OpenDesign today. What moves is the brand and the brief, through a one-time extraction; the browser project, its runtime and its deployment stay in Bolt.
| Moves across | |
|---|---|
| The brand | Point your agent at the running app or a screenshot; it extracts colours, type, spacing and voice into DESIGN.md. |
| Briefs and prompts | Plain text. Paste the prompts that built the Bolt project into an OpenDesign project as-is. |
| Exported front-end code | Bolt's export can serve as a structural reference; the agent re-renders rather than patches it. |
| Stays in Bolt | |
| The browser runtime | OpenDesign does not boot a dev environment; the app keeps running where it is. |
| Backend scaffolding and deploy | Deployment stays one click in Bolt; OpenDesign leaves deploy to you. |
| Project history | Messages and versions in the sandbox do not come across; OpenDesign starts its own version trail. |
-
Install OpenDesign and open a project
Download the desktop app and create a project in the repo where the design should live. The quickstart covers the source-build path separately.
-
Point your agent at the Bolt app
Use the preview URL or a screenshot of the screen whose look you want to keep as a reference.
-
Ask the agent to extract the brand into DESIGN.md
Review the file by hand: one accent, the right fonts, the right radius. This is the only migration step that needs judgment.
-
Render the screen you want to improve
Pick a skill and render the original brief against the new brand; iterate by pointing at elements. Bring the accepted UI back into the Bolt project or the exported codebase when it is done.
Running both
Keep Bolt for the runtime and quick full-stack spikes; use OpenDesign for the interface and the brand. Treat DESIGN.md as the source of truth for styling. Nothing syncs automatically.
Fallback and loss
If you stop paying for Bolt, export the code first: the hosted runtime and deployment are the parts OpenDesign cannot recreate. If an OpenDesign render fails, the last version stays on disk and the brief is unchanged.
A 20-minute test
Try OpenDesign on a Screen from Your Bolt App
Take a screen you built in Bolt and rebuild it in OpenDesign with your own agent. If the result is not usable in twenty minutes, this comparison has told you something worth knowing.
1The task
Here is a screenshot of a page from my Bolt app. Extract its brand into DESIGN.md, then rebuild the same page from this brief using my design rules. Check it at desktop and mobile widths.
- 01Screen inA screenshot or the preview URL of the Bolt page you want to improve.
- 02DESIGN.md outYour brand extracted into a file in the repo — review it by hand.
- 03Same page, renderedDesktop and phone, then one edit made by pointing at an element.
2It worked if…
- DESIGN.md exists in the repo and you would sign off on its tokens.
- The page renders at 1440 and 390 with no horizontal scroll.
- One edit ("calmer headline") applied by pointing at the element, not by rewriting the brief.
- Two versions sit side by side as files; nothing was overwritten silently.
If it did not work: check that your agent is connected and authenticated for your chosen mode, then retry with a smaller brief before judging the tool.
Other options
Other Bolt Alternatives
FAQ
Bolt Alternative: FAQ
Is OpenDesign a drop-in Bolt alternative?
No. Bolt ships running full-stack apps in the browser; OpenDesign is design-first and produces interface artifacts you own. They overlap on prompt-to-UI, not on running a backend. The verdict lists the conditions for each.
Is there an open-source bolt.new?
bolt.new itself is proprietary; OpenBolt (bolt.diy) is the community open-source fork you can self-host. OpenDesign is a separate open-source, local-first tool focused on the design layer, not a hosted app builder.
Can OpenDesign build a full app like Bolt?
No. OpenDesign focuses on interfaces, prototypes, decks and brand systems as files. For an instant in-browser full-stack app, Bolt is the better fit.
bolt.new vs Lovable vs v0 — which should I use?
Bolt runs a full-stack app in the browser from a prompt; Lovable is aimed at building full apps for non-technical makers; v0 generates React and Next.js UI. Pick OpenDesign when you want to own the design artifacts as version-controlled files rather than state inside a hosted project.
Can I keep using Bolt alongside OpenDesign?
Yes. Iterate the interface in OpenDesign as files and keep the runtime and deployment in Bolt. Migration is manual today; see what moves and what stays.
Which coding agent does OpenDesign use?
Yours: Claude Code, Codex, Cursor, Gemini, OpenCode or Qwen, with your own key. API spend bills to your account and credentials are never proxied.
Is OpenDesign really open source?
Yes. It lives at github.com/nexu-io/open-design under Apache-2.0 and is self-hostable.
Is OpenDesign affiliated with Bolt or StackBlitz?
No. OpenDesign is an independent open-source project. Bolt and bolt.new are trademarks of their owner; this is an unaffiliated comparison written by the OpenDesign team.
Try OpenDesign on One Real Screen
Rebuild a page from your Bolt app with your own coding agent, judge the round trip, then decide. Choose the situation that matches you; the page does not detect your setup.