Get from idea to proof of concept | Codex use cases
Codex use cases
Codex use case
Get from idea to proof of concept
Explore the concept visually with ImageGen and build a first version of your idea.
Difficulty Intermediate
Time horizon 1h
Use Codex with ImageGen to turn a rough idea into a visual direction, implement the smallest useful prototype, and verify it in a browser.
Best for
- Early product ideas where a working prototype will answer more than a written plan.
- Web apps, dashboards, and tools that need visual exploration before implementation.
- Teams that want to validate a product idea with a working prototype before investing further.
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Use Codex with ImageGen to turn a rough idea into a visual direction, implement the smallest useful prototype, and verify it in a browser.
Intermediate
1h
Related links
Image generation guide Codex plugins
Best for
- Early product ideas where a working prototype will answer more than a written plan.
- Web apps, dashboards, and tools that need visual exploration before implementation.
- Teams that want to validate a product idea with a working prototype before investing further.
Skills & Plugins
-
ImageGen
Generate visual concepts, UI mockups, asset directions, and variants with
gpt-image-2before Codex implements the selected direction. -
Open the running app in a real browser, inspect the changed route, and verify each small UI adjustment before the next iteration.
-
Use the concept-first workflow for new web apps, dashboards, sites, and frontend prototypes, then verify the implementation in the browser.
-
Use Game Studio when the proof of concept is a browser game and needs a playable loop, asset workflow, HUD, engine choice, and playtest pass.
| Skill | Why use it |
|---|---|
| ImageGen | Generate visual concepts, UI mockups, asset directions, and variants with gpt-image-2 before Codex implements the selected direction. |
| Playwright | Open the running app in a real browser, inspect the changed route, and verify each small UI adjustment before the next iteration. |
| Build Web Apps | Use the concept-first workflow for new web apps, dashboards, sites, and frontend prototypes, then verify the implementation in the browser. |
| Game Studio | Use Game Studio when the proof of concept is a browser game and needs a playable loop, asset workflow, HUD, engine choice, and playtest pass. |
Starter prompt
Use ImageGen to generate a high quality UI mockup for the following idea, then use the [Build Web Apps plugin/Game studio plugin] to implement it: [describe the idea, target user, and the main workflow]
Use ImageGen to generate a high quality UI mockup for the following idea, then use the [Build Web Apps plugin/Game studio plugin] to implement it: [describe the idea, target user, and the main workflow]
Start with a visual direction
GPT Image 2 is great at generating high quality UI mockups. Instead of starting from scratch when exploring new ideas, you can leverage image generation to get a visual direction.
You can do this in two ways:
- Iterate on the visual direction using the ImageGen skill, and once you are satisfied with the proposed UI, you can ask Codex to build a prototype matching the visuals. In that case, make sure to copy the final image you want to implement in a new turn rather than continuing the conversation directly – Codex will do better when it can reference a user attachment.
- Use a plugin and simply describe your idea: the plugin will generate the visual direction for you and handle next steps.
Leverage a plugin
If you do not need to iterate on the visual direction before starting the implementation, you can use a plugin and describe your idea.
Use the Build Web Apps plugin for web apps, dashboards, creative websites, and frontend-heavy tools. Its workflow pushes Codex to generate a design first, match it in code, and use the browser to compare the result back to the concept.
Use the Game Studio plugin when the proof of concept is a browser game. That path should define the player verbs, first playable loop, engine, asset workflow, HUD, controls, and browser test before expanding the game.
Iteration workflow
A good proof of concept is scoped to an MVP that can be implemented quickly and validated with the team. If you want to make sure the MVP is working as expected, you can use Playwright interactive to let Codex verify its work.
Once you have a first version working, you can iterate on it by asking for scoped changes in the same conversation:
Add a new [feature/bug fix/etc.]. Use Playwright interactive to verify your changes. Feedback to apply: [paste comments, screenshots, or review notes]
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