Use an AI app builder such as Lovable, Bolt.new or v0 when people need to log in, save data or pay inside what you're building. Use an AI website builder when you need pages that explain an offer and get visitors to act: a homepage, a pricing page, a portfolio, a launch site. Plenty of products need both, usually a marketing site on the main domain and the app on a subdomain, and it's fine to build them with different tools.
FNJ publishes this blog and makes an AI website builder, so it sits on one side of this comparison; weigh our view with that in mind. Competitor facts come from each vendor's own website or docs. Checked October 2026; plans and features change, so confirm on each vendor's site.
The difference in one table
| AI app builders | AI website builders | |
|---|---|---|
| Examples | Lovable, Bolt.new, v0 | FNJ, Framer, Webflow, Squarespace, Wix |
| What you get | A software project: front end, server code, database, log-ins | Designed pages: a design system, layouts, copy, SEO settings |
| How you shape it | Mostly chat, plus code | Chat plus a visual editor |
| What you maintain | Code, packages, database, authentication, environment variables | Content and design |
| Hosting | A host that runs your app, plus a backend | The builder's hosting, or exported files on your own host |
| Strong at | Log-ins, dashboards, stored data, custom logic | Visual polish, responsive layouts, quick content edits |
What AI app builders actually produce
App builders generate a codebase. That's their strength, and it's the thing to plan for.
- Lovable builds websites and web apps from chat. Apps created since May 2026 use TanStack Start, which runs server code, and its built-in backend can be moved to managed or self-hosted Supabase. Its docs set out what you own and how to move it, including that the database and uploaded files export separately from the code.
- Bolt.new builds apps and websites from chat, and its Bolt Cloud supplies hosting, databases and user authentication. You can download any project as a ZIP and run it locally with Node.js.
- v0 by Vercel describes itself as a platform for production-ready, full-stack web apps built with Next.js, React, TypeScript, Tailwind CSS and shadcn/ui. Its FAQ says you can export the code and deploy elsewhere, though previews and deployments are designed around Vercel.
All three can make a landing page, and v0 lists landing pages among its examples. The question isn't whether they can. It's whether you want to own an application to get one.
Owning an app means a few ongoing jobs:
- Security is yours. Log-ins and stored data need correct access rules. Generated code can have the same gaps as hand-written code, so someone should check who can read and change what.
- Running costs follow usage. An app's hosting, database and storage bills grow with its users and data, whoever hosts it.
- Updates never stop. Frameworks and packages change, and a server-rendered app needs a host that runs server code, not just a folder of files.
None of that is a reason to avoid app builders. It's a reason not to use one for a job that doesn't need it.
What AI website builders produce
Website builders aim at a different result: a set of designed pages that look right on every screen and are easy to change.
- Framer's AI agent generates editable pages, sections, copy and visuals on its design canvas, with CMS, hosting and analytics included.
- Webflow's AI site builder turns a prompt into a site plus a design system you can customize.
- Squarespace's Blueprint AI builds a multi-page site from a description of your business, which you refine in its drag-and-drop editor.
- FNJ designs a complete marketing site from your description plus a reference (a screenshot, a link to a site you like, or your brand files), at desktop, tablet and phone widths, then exports Next.js or static HTML for you to host.
Framer, Squarespace and Wix keep your site on their hosting; Webflow (for static pages) and FNJ let you export it. Either way, there are fewer moving parts than in an app. A marketing site has no user accounts to secure and no database to back up. Exported static pages can sit on a free static hosting tier; Cloudflare Pages' free plan, for example, publishes no bandwidth cap for static assets.
The limit is just as clear: a website builder is the wrong tool for anything with logic. FNJ in particular has no forms, store checkout, log-ins, databases or CMS. You link a form, booking or store tool from a button instead.
When an app builder wins
Pick an app builder when the thing you're building does work for the visitor, not just tells them something:
- A client portal where customers log in to see their files or invoices
- An internal tool, such as an inventory tracker or an approval queue
- A SaaS MVP that people sign up for and use every day
- A calculator, quiz or configurator that saves results to an account
- A dashboard over your own data
When a website builder wins
Pick a website builder when the job is to explain, persuade and earn a click:
- A small-business site: services, about, location, contact
- A portfolio for a photographer, designer or developer
- A restaurant site with the menu, opening hours and a booking link
- A campaign or launch page (FNJ's AI landing page builder covers this case)
- The marketing site for a software product: home, features, pricing, changelog
For that last one, our list of the pages a SaaS website needs at launch helps you scope it before you build.
Search and link previews: check how pages are delivered
Marketing pages have to be found and shared, so check how a page reaches the browser before you launch. Pages whose content arrives as ready HTML are the simplest case for search engines. Google can render JavaScript, but its JavaScript SEO basics describe extra steps and pitfalls for sites that depend on it, and link previews in chat and social apps generally read the page's HTML tags rather than running scripts.
A quick test for any builder: open the published page, use your browser's "view page source" (not the element inspector), and confirm your headline, title tag, description and preview image tags are there. App builders vary. v0 uses Next.js, which can render pages on the server, and Lovable's newer apps run server code, while Lovable's older React and Vite apps build to static files that typically fill in content with JavaScript in the browser.
On FNJ's side, every page gets its own search title and description and a real heading structure, and the exported code includes Open Graph and Twitter tags, a canonical link and structured data when you set them.
Using both: the common split
Many software products keep the marketing site and the app apart: example.com for marketing, app.example.com for the product. The reasons are practical:
- Whoever writes the marketing copy can change a headline without touching app code or waiting for a release.
- An app deploy that breaks something doesn't take the homepage down with it.
- Each part sits on hosting that suits it: static hosting for pages, a server and database for the app.
In practice, you build the product in an app builder, build the marketing site in a website builder, and point the "Log in" and "Sign up" buttons at the app. Our page on AI websites for SaaS products shows how FNJ handles the marketing half.
Decide in five questions
- Will anyone log in? If yes, that part needs an app builder or a platform feature built for it.
- Does a visitor's input need to be stored? If it's only a contact form, a hosted form service may be enough. See how to add a contact form to a static website.
- Who maintains it next year? An app needs someone who can update packages and fix a broken build. A static site mostly needs someone who can edit copy.
- What matters more, look or logic? Design-first builders give you finer visual control; app builders give you behavior.
- Where will it run, and who pays for that? Static pages are cheap to host. An app's backend grows with its users.
Where FNJ fits
FNJ is a website builder, not an app builder. It designs marketing sites from your references and exports code you host yourself; it doesn't build forms, log-ins or databases. If you're launching a product, a sensible pairing is an app built in a tool like Lovable, Bolt.new or v0 and a marketing site built with the FNJ AI website builder, joined by a sign-up button.
Frequently asked questions
What is the difference between an AI app builder and an AI website builder?
An AI app builder generates a software project with server code, a database and log-ins, which you then run and maintain. An AI website builder generates designed pages for explaining and promoting something, with far less to maintain.
Can Lovable, Bolt.new or v0 build a marketing website?
Yes. All three can generate websites and landing pages, and v0 lists landing pages among its examples. You end up with an application codebase to host and maintain, which is more than a simple marketing site needs.
Do I need an app builder to add a contact form?
Usually not. A hosted form service such as Formspree or Tally can be linked or embedded from a static page, which keeps the site itself simple.
Should a software company build its marketing site and app with the same tool?
It doesn't have to. Many teams keep the marketing site on the main domain and the app on a subdomain, built and deployed separately, so marketing changes never wait on an app release.
Is a marketing site cheaper to run than an AI-built app?
Usually, because a static marketing site needs no database or server and can run on a static host's free tier, such as Cloudflare Pages. An app adds a backend and hosting that grow with use.