Not a mockup enables product teams to create and test live page variants directly on their production site without building mockups or clones. By ingesting the real DOM, styles, and content, it generates multiple design variants in minutes, letting users pick a winner and deploy it to live traffic with end‑to‑end measurement.
Funding
Funding not disclosed
Founders
Product
Problem
Product teams often rely on static mockups or separate staging environments to prototype UI changes, which requires rebuilding pages and cannot guarantee that the design will look or behave the same in production. This creates a slow feedback loop and uncertainty before shipping changes to live traffic.
Solution
Not a mockup enables product managers, designers, and engineers to create and test UI variants directly on their live production pages. By selecting an element on the real DOM and issuing a natural‑language instruction, the tool uses LLMs (Claude, GPT, or Gemini) to generate DOM patches that are applied instantly, showing a true‑to‑life preview within seconds. Teams can generate dozens of style or content variations, run live experiments on the actual site, and select a winner that is shipped to production traffic with end‑to‑end measurement of impact. The workflow eliminates the need for separate mockup tools, staging builds, or manual code changes, accelerating iteration and reducing risk.
Target Audience
Primary users are product managers, UX/UI designers, and front‑end engineers who need to prototype, test, and iterate on UI changes directly within their live web applications.
Features
- Chrome extension that captures the live page’s DOM context and sends user instructions to LLMs for automatic DOM patch generation
- Real‑time rendering of edits on the actual production page, preserving true styles, scripts, and layout
- Ability to generate multiple UI variants quickly (e.g., 127 variants in 41 minutes) and preview each instantly
- Built‑in live experiment mode to run A/B tests on live traffic and measure performance end‑to‑end
- One‑click “Save & share” creates a shareable prototype with full‑page screenshots stored in Google Cloud Storage
- Integration with Anthropic, OpenAI, and Google Gemini for flexible LLM selection and privacy‑compliant inference