FNJ

AI website builder for SaaS

Your SaaS website, designed by AI and shipped as code

FNJ's AI website builder designs SaaS and startup websites from your product description and a site you admire: a hero with a specific promise, features, how it works, pricing, FAQ and supporting pages, at desktop, tablet and phone widths. Export it as a Next.js project or static HTML and deploy it next to your app.

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The pages a product site needs

Describe the product and the builder plans the site, typically:

  • A hero with one promise, one primary call to action and product visuals you upload.
  • Features and how it works, in scannable sections.
  • Pricing with your tiers, and an FAQ that answers objections.
  • Pages such as about, changelog, customers or careers, if you ask for them.

Lives next to your app

Export the marketing site as Next.js and put it in your monorepo, or as static HTML on its own domain. It's plain code your engineers can read, with no FNJ dependency to maintain.

Iterate like a product team

Ask for a sharper headline, a new pricing tier or a comparison section in plain words, or edit by hand. Each prompt can be undone. When the positioning changes, the site changes in minutes, not sprints.

FNJ's AI website builder at a glance

Starts from
Your description plus up to 3 references: screenshots or links of sites you like
Designs
Every page at desktop (1440px), tablet (810px) and phone (390px) widths
Editing
Ask for changes in plain words, or edit any element by hand on the canvas
Export
A Next.js project, static HTML, or a push to your own GitHub repository
Hosting
Yours: Cloudflare Pages, Vercel, Netlify or any static host. No FNJ runtime in the code
Price
From $25/month, or $29 once for 50 credits. Every site you build is yours to keep
AI account
None needed: FNJ runs the AI for you, no API key or AI subscription

How it works

  1. 01

    Show and tell

    Add up to 3 screenshots or links of sites you'd like yours to look like, then say what the business is and which pages you need.

  2. 02

    Watch it build

    The AI builder plans the pages, palette and type, then builds each page on the canvas, section by section, while you watch.

  3. 03

    Refine and ship

    Ask for changes in plain words or edit by hand, then download the code or push it to your GitHub.

Built with FNJ's AI builder

Look at this beautiful site our AI builder built in 10 minutes

One prompt and a screenshot of a site we liked, recorded as it happened. The builder designed a portfolio, built every page on the canvas for desktop, tablet and phone, and handed over the code. The video skips the waiting.

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SaaS & startups: questions

Can I put the site in my existing Next.js monorepo?
Yes. The Next.js export is a standard App Router project with plain CSS; copy its routes into your app or deploy it as its own project.
Can it build a sign-up flow or dashboard?
No. It builds the marketing website. Point its sign-up and log-in buttons at your app.
Can I show product screenshots?
Yes. Upload your screenshots or product images anywhere an image is used.
How fast can we ship a first version?
A first version of a multi-page site builds in minutes while you watch. Refinement is up to you; most teams iterate over a handful of prompts.

Design inspiration

SaaS, app and AI website design inspiration

13 real designs in our design library, each with a prompt that opens the builder with the design as your reference. Landing pages for SaaS tools, AI products, fintech and mobile apps. They sell the product by showing it: dashboards, phone mockups and floating stat cards sit in the hero, and the page below follows a familiar order from features to pricing.

Browse software designs

Related guides

More from the AI website builder

See the AI website builder and a live demo

Show it a site you love. Get yours.

Start buildingWatch a demo