B12

b12.io ↗

AI website builder for sites, stores, and web apps.

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SI Score: 80/100
Pricing: Not confirmed
Free plan: Not confirmed
Sign-up required: Not confirmed

Ask SI about B12

Answers use saved listing facts and recorded sources.

Homepage screenshot

SI REVIEWBased on the site's own pages, in a directory managed by people

What it does

B12 is an AI website builder. It builds websites, online stores, portfolios, blogs, and web apps from a prompt. Users can refine the result by chatting with the AI Agent or using a visual editor. The site also lists tools for client intake, contact management, email marketing, commerce, contracts and eSignatures. A free start and signup are available.

The home page shows a limited time offer to try B12 for $1 for 7 days. The signup page says users can generate a free site, store, or app with AI. The about page states B12 launched in 2016 and has powered more than 4 million sites. It also describes an Expert Marketplace connecting users with B12-vetted designers, copywriters, and SEO specialists.

Best for

Building websitesOpening online storesCreating web appsPublishing blogs

SI Score

80/100

#1 in Coding & AI Platforms

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 28, 2026Score ceiling for this evidence: 84/100.

Product usefulness 80

Evidence

B12 documents describing a site/app, receiving a draft, changing it through chat or a visual editor and publishing. The pricing page distinguishes a free B12 subdomain and limited AI credits from custom-domain plans. These inputs, controls, output and launch boundaries support80; generated app correctness was not tested.

Limits: Source-researched AI assessment reviewed by a separate native AI worker. No hands-on product test or human verification is claimed.

Source links and check dates are in Sources and checks below.

Separate website checks

These checks do not add points to the SI Score. They inspect the website's HTML, not the product in use.

Basic website checks100/100

HTTPS: yes
Homepage answered with HTTP 200
Privacy policy link: found
Terms link: found
Contact or about page: found

We check that these pages exist, not what they say. Ownership and company details are not verified.

Checked Oct 18, 2026.

HTML accessibility checks88/100

Page language set: en
Mobile viewport: yes
Images with a text alternative: 48 of 72
Main heading (h1): yes

Automated checks on the homepage HTML only. This is not a full accessibility audit.

Checked Oct 18, 2026.

Homepage HTML response100/100

First byte after 24 ms
Homepage HTML loaded in 0.0 s
HTML size 406 KB

Measured once from our server. Images, scripts and your own connection are not included.

Checked Oct 18, 2026.

Trackers in homepage HTML76/100

Third-party trackers in the homepage code: Google Analytics, Google Tag Manager

Only the homepage HTML is checked. Trackers loaded later by scripts, and what the service does with your data, are not covered.

Checked Oct 18, 2026.

Page date hints100/100

A copyright year is a weak sign of upkeep. It does not prove the content is current.

Checked Oct 18, 2026.

Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

How the SI Score works →

Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

www.b12.io/
- Product usefulness evidence
- Basic website checks (separate check)Checked Oct 18, 2026
- HTML accessibility checks (separate check)Checked Oct 18, 2026
- Homepage HTML response (separate check)Checked Oct 18, 2026
- Trackers in homepage HTML (separate check)Checked Oct 18, 2026
- Page date hints (separate check)Checked Oct 18, 2026
www.b12.io/pricing
- Product usefulness evidence
www.b12.io/privacy-policy/
- Basic website checks (separate check)Checked Oct 18, 2026
www.b12.io/glossary-of-web-design-terms/
- Basic website checks (separate check)Checked Oct 18, 2026

Checks without a source link

PricingUnknownChecked Oct 18, 2026
Free planUnknownChecked Oct 18, 2026
Sign-up requiredUnknownChecked Oct 18, 2026
PlatformsUnknownChecked Oct 18, 2026
APIUnknownChecked Oct 18, 2026
Open sourceUnknownChecked Oct 18, 2026

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