AI Mockup Generator

An AI mockup generator you can actually iterate on.

Describe a screen in plain English and get an editable UI mockup in your workspace. Draw on it, ask the agent to revise it, review the visual diff, then use the same context to implement the real interface.

Download

Works with your existing Claude Code and Codex subscription or API key

Other downloads: Apple Silicon Mac Intel Mac Windows Linux
Nimbalyst AI mockup generator showing a before and after editable UI mockup diff

Mockups are better when they stay editable

Nimbalyst mockups are real workspace files. Describe a dashboard, settings page, onboarding flow, or feature screen, and the agent creates a rendered `.mockup.html` file you can open, edit, annotate, and keep with the rest of the project.

That makes the mockup useful after the first draft. You can compare before and after, draw directly on the screen, ask for a revision in chat, turn the result into specs, and keep the same context when Claude Code or Codex implements the interface.

Why Nimbalyst

From text prompt to editable UI mockup to shipped code

Generate a rendered UI mockup

Generate a rendered UI mockup

Ask for a dashboard, onboarding flow, settings page, or landing page and Nimbalyst opens the result as a rendered `.mockup.html` file.

Draw feedback directly on the mockup

Draw feedback directly on the mockup

Circle an area, sketch an arrow, or mark the exact component that needs work. Your agent receives the annotation as visual context.

Revise conversationally

Revise conversationally

Keep the mockup open while you ask for tighter spacing, a different state, new copy, or a variant layout. The chat and mockup stay together.

Review visual changes

Review visual changes

Mockup edits are not hidden in raw HTML. You see the rendered result and can compare the before and after before accepting the change.

Turn mockups into specs

Turn mockups into specs

Generate implementation notes, acceptance criteria, and tickets from the mockup while preserving the design context that produced it.

Implement with Claude Code or Codex

Implement with Claude Code or Codex

The same workspace can run Claude Code and Codex against your repo, so the mockup can become a real component instead of a separate handoff.

Comparison

AI image mockups vs editable mockups in Nimbalyst

Feature Typical AI mockup generator Nimbalyst
Output Static image or isolated prototype Editable `.mockup.html` file in your workspace
Prompt workflow Prompt again and hope the new version is close Keep the mockup open and revise it conversationally
Visual feedback Describe changes in text or export comments elsewhere Draw annotations directly on the rendered mockup
Version review Manual comparison between screenshots Review the generated change before accepting it
Implementation handoff Export image, then explain intent to engineering Generate specs, tickets, and implementation work from the same file
Code context Disconnected from your repo Claude Code and Codex can build against your actual project
Best fit Inspiration and quick visuals Product, design, and developer workflows that continue after the mockup

FAQ

Frequently asked questions

What are the best AI mockup generators?
The best AI mockup generator depends on what you need after the first visual. If you only need a static concept image, image-first tools can work. If you need an editable UI mockup that you can annotate, revise, turn into specs, and eventually implement in your repo, Nimbalyst is built for that loop.
Can AI turn a text prompt into an editable UI mockup?
Yes. In Nimbalyst, you describe the screen in natural language and the agent creates an editable `.mockup.html` file that renders inside the workspace. You can then keep prompting, draw annotations on the mockup, and review the result visually.
Is Nimbalyst a wireframe generator?
Nimbalyst can generate wireframes, UI mockups, dashboard concepts, settings pages, onboarding flows, and prototype screens. It is broader than a wireframe generator because the mockup stays connected to specs, tasks, agent sessions, and code implementation.
Can I annotate an AI-generated mockup?
Yes. Nimbalyst includes drawing annotations for mockups. You can circle a region or mark a change directly on the rendered mockup, then ask the agent to use those annotations in the next revision.
Can the same AI agent implement the mockup?
Yes. Nimbalyst runs Claude Code and Codex in the same workspace, so after the mockup looks right you can ask an agent to implement it against your actual repo and review the code diff before it lands.
Is Nimbalyst only for designers?
No. Product managers use it to turn ideas into screens, designers use it for fast iteration, and developers use it to make visual intent concrete before coding. The important part is that the mockup is editable and connected to the rest of the work.

Learn More

Related guides and comparisons

Mockup Editor

Generate, annotate, and iterate on interface mockups with an agent.

UI Mockups & Wireframes

The full workflow: describe a UI, get a mockup, iterate, then implement it.

Best AI Mockup Tools (2026)

A comparison of AI mockup and UI generation tools.

Best AI Mockup Tools for Developers

Which tools work when the mockup needs to turn into code.

Prototyping

Turn mockups into working HTML/CSS prototypes with hover states and responsive layouts.

Design Handoff

Generate specs, implementation tickets, and review notes from mockups.

Claude Code for Product Managers

Plan, mock up, run agents, and review every change in a visual workspace.

Nimbalyst is the open-source visual workspace for building with Codex, Claude Code, and more

Download

Works with your existing Claude Code and Codex subscription or API key

Other downloads: Apple Silicon Mac Intel Mac Windows Linux