B12 review
8.7The fastest route from a description to a working website: an AI builder that drafts a complete site, store or simple web app from one prompt, then lets you edit it by chatting or clicking.
| Ease of use | 9.4 | |
|---|---|---|
| Design | 8.6 | |
| Flexibility | 8.4 | |
| Value | 8.6 | |
| Support | 8.8 |
What's good
- A complete site, store or web app drafted from one prompt in about two minutes
- Edit by chatting with the AI Agent, clicking any element or uploading a screenshot of what you want
- Commerce, backends, logins and analytics included from the $24 Website plan
What's not
- Less pixel-level design control than Webflow or Framer
- For a large catalogue or complex app code, Shopify or a code-first AI app builder goes further
B12 is an AI website builder that goes further than most: describe what you want, whether that is a website, an online store, a web app or a small business tool, and about two minutes later you have a complete first draft with pages, copy, layout and working features built around what you described. B12 says more than four million sites have been generated this way.
What sets it apart is what happens after the draft. You keep editing with the same AI, by chatting with its agent, clicking the element you want to change or uploading a screenshot of what you have in mind, and the result can include real logins, payments, bookings and a database rather than just pages. Among the builders we score, it is the shortest route from an idea to something that works.
One prompt, a whole site
B12's first draft is meant to be a finished starting point, not a template. You describe the business or project in a sentence or two, and the AI builds the whole thing around it: if you ask for an online store for handmade ceramics, you get product pages, checkout and copy about ceramics, not a generic template to strip back. B12 puts the time from prompt to complete draft at about two minutes.
That matters because the draft is where most builders lose people. A finished structure with relevant pages and copy turns the job from building a site into editing one, which is a much smaller task for someone who is not a designer.
Editing by talking to the AI
After the draft, you edit with B12's AI Agent the way you would brief a designer: "make the hero darker", "add a pricing page", "write a launch post about our new collection". You can click an element to focus the change on it, upload a screenshot to show what you mean, and generate images and text without leaving the editor. The visual editor is there for direct changes, and in practice most people switch between the two.
The AI runs on credits: five a day on the free plan (up to 30 a month), 100 a month on Website and 300 on Website + Client Engagement. Small copy changes use little; asking for a new section or a redesign uses more, so the higher allowance matters mainly if you rebuild often.
More than pages: stores, web apps and backends
This is where B12 moves out of the website-builder category. From the Website plan up, projects include commerce and backends, so a site can take payments, handle bookings, put pages behind a login or store data in a database. B12 also builds small web apps and business tools, such as trackers, generators or a loan calculator with lead capture, from the same prompt box.
It is not trying to be a code-first app builder. Lovable, Replit and Bolt start from code and hand you a codebase; B12 starts from a finished, hosted website and adds the working parts a business needs. For most small businesses and founders that is the more useful starting point.
The client tools on the higher plan
The Client Engagement plan adds tools most builders leave to third parties: client intake forms, contracts with e-signature, email marketing, a contact manager and file uploads. They are useful if your business serves clients, and they can replace a separate e-signature or email tool, but they are an extra on top of the builder rather than the reason to choose it.
Where it is weaker
B12 favours speed and a guided result over total design freedom: the AI and editor produce well-structured pages quickly, but a designer who wants to place every element by hand will be happier in Webflow or Framer. Commerce is included, yet a store with a large catalogue, complex inventory or multi-channel selling will find more depth on Shopify. And if you are building a software product and want to own and extend the codebase, the code-first AI app builders are designed for that.
Pricing
From US$20/mo · B12 pricing
Who it's for
Anyone who wants to go from a description to a finished, working site without assembling it: small businesses, founders, freelancers and teams who need a website, a store or a simple web app live this week, and would rather talk to an AI than learn a design tool.
Who it isn't for
A designer who wants pixel-level control over every layout, where Webflow or Framer fit better, or a merchant with a large, complex catalogue, where Shopify's commerce depth wins. If you need to own and hand-edit an app's codebase, a code-first AI app builder such as Lovable or Replit is the better home.
Limits worth knowing
- Less pixel-level layout control than a design tool such as Webflow or Framer
- Commerce is included but shallower than a dedicated store platform
- AI credits are metered per plan, so heavy rebuilds use them faster
- The client tools (intake, contracts, email marketing) are on the Client Engagement plan, not the entry plan
Questions people ask
What can B12 build?
Websites, online stores, portfolios, blogs, web apps and small business tools such as quote calculators, all from one prompt. Web apps can include logins, dashboards and a database, and stores get product pages, checkout and invoicing.
How do you edit a B12 site after the AI builds it?
Either by chatting with the AI Agent, for example "make the hero darker" or "add a pricing page", or by clicking an element in the visual editor. You can also upload a screenshot to show the AI what you want, and generate images and text inside the editor.
Is the AI-generated site usable as-is?
As a first draft, yes: it is built around what you described, with relevant pages, copy and features rather than a generic starter site. Like any AI output it improves with your own words, especially on the pages customers read most.
How does B12 compare with Lovable or Bolt?
B12 starts from a finished website and adds app features such as logins, payments and databases. Lovable and Bolt start from code and are built for apps first. For a business site, store or simple tool, B12 gets you further with less effort; for a product whose codebase you want to own and extend, the code-first builders fit better.
The bottom line
B12 is the AI builder we would point most people to first: one prompt gives you a complete site, store or simple web app, and you keep improving it by talking to the same AI. Start on the free plan to see the draft, and move to the $24 Website plan when you want your own domain, commerce and backends.
Choose Webflow or Framer if pixel-level design control matters more than speed, Shopify for a large store, and Lovable or Replit if you need an app's codebase in your own hands.
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