Bolt and OpenAI Codex both let you describe a change in plain English and have an AI do the work. But they are aimed at different people and different starting points. Bolt builds web apps in your browser. Codex is OpenAI's coding agent, offered as a command-line tool, an IDE extension and a cloud service.
The short version
| Bolt | OpenAI Codex | |
|---|---|---|
| What it is | Chat-to-app builder in the browser | Coding agent (CLI, IDE extension, cloud) |
| Best for | Going from idea to a live web app | Changing and extending a codebase |
| Where you work | Browser | Terminal, editor extension or cloud |
| Starting points | A prompt, Figma, GitHub or a team template | Your existing project and instructions |
| Free plan | Yes, with a token cap | Included with ChatGPT plans, and OpenAI's page lists a Free plan for quick tasks (check limits). Or use API credits |
| Open source | No | Yes |
| MCP support | Yes, custom MCP connectors | Yes |
| Project instructions | Chat prompts | AGENTS.md |
Pricing changes often. See Bolt and OpenAI Codex for current plans.
What they have in common
- Natural-language instructions. You say what you want and the AI writes the code.
- Real code is produced. Bolt builds a web project; Codex edits files in your own project.
- GitHub plays a part. Bolt lists GitHub as a starting point. OpenAI's docs list a GitHub integration for Codex.
Key differences
Who it is built for. Bolt assumes you may not code at all. You chat, see the result, and publish. Codex assumes you have a project and are comfortable reviewing what an agent changes.
Where it runs. Bolt lives entirely in the browser. Codex gives you a choice: the CLI (installed with npm install -g @openai/codex), an IDE extension, or Codex Cloud. Setup is more involved than opening a website.
Hosting. Bolt's homepage mentions hosting with analytics and custom domains. Codex is about writing and changing code; where you deploy it is up to you.
Instructions and extensibility. Codex reads AGENTS.md for standing project instructions and supports MCP servers (a standard way to plug extra tools into an AI). Bolt's help is built around prompting, Plan Mode and its own templates. Bolt's help centre also documents connecting custom MCP servers.
Access. Bolt has a free plan with a monthly token cap, and free tokens can run out quickly on bigger projects. Codex is included with ChatGPT plans (OpenAI's pricing page lists Free, Go, Plus, Pro, Business, Edu and Enterprise), though the Free plan is described only as a way to explore quick tasks, so check its limits. You can also use an API key.
Do they work together?
They can, if you export or sync the code from Bolt to GitHub and then point Codex at the repository. That pattern (prototype quickly in a builder, then hand the code to an agent for the harder work) is common across app builders and coding tools. Confirm your Bolt plan's GitHub options before you rely on it. See our Lovable vs Bolt page for more on that workflow.
Who should pick what
- You've never coded and want a site or app online: Bolt.
- You have a Figma design to start from: Bolt.
- You're a developer with an existing project: Codex.
- You want your agent to work from a repo's
AGENTS.mdinstructions: Codex. - Your app has outgrown a prototype and needs careful changes: Codex, or another coding agent such as Claude Code.
Our verdict
If you want a result today without setup, start with Bolt. If you're maintaining real code, Codex is the better category of tool. Don't expect one to replace the other.