Assembly vs B12
Assembly
assembly.com
B12
b12.ioSide by side
| Figure | Assembly | B12 |
|---|---|---|
| Price from | $29/mo | $24/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 5 | 3 |
| Spec score · Legal Client Portal Software | 9.3 (#1) | 9.2 (#3) |
| Documentation | The documentation includes getting-started guides, built-in app references, custom-app building, API reference, MCP and support sections. | The Help Center is organized into getting started, AI Agent, built-in features, integrations, publishing/domains, troubleshooting, billing and support sections. |
| Integrations | Assembly supports embedded third-party tools and connects to more than 1,000 apps through Zapier, Make and similar no-code services. | Listed integrations include Calendly, Shopify, Ecwid, PayPal, Google tools, Eventbrite, WhatsApp, WordPress, YouTube and custom HTML or scripts. |
| Praise: support | Software Advice reviewers describe customer support as responsive and say the product is regularly improved. | GetApp reviewers repeatedly describe B12 support as friendly, knowledgeable, personal and quick to resolve issues. |
| Product | Assembly combines an AI app builder with a CRM and branded client experience for building client-facing apps and internal tools. | B12 builds websites, online stores, portfolios, blogs, web apps, and internal business tools from a prompt. |
| Rating on Capterra | 4.8 out of 5 from 35 reviews for the client-portal listing. | 4.1 out of 5 from 113 reviews. |
| Rating on G2 | 4.7 out of 5 from 344 reviews. | 4.2 out of 5 from 30 reviews. |
| Rating on Software Advice | 4.8 out of 5 from 35 reviews. | 4.1 out of 5 from 113 reviews. |
| Support | Support ranges from community support on Free to email support on Starter and priority email support on Professional and Advanced. | Paid Website plans include email and chat support; B12 also advertises scheduled calls and an expert marketplace. |
| What it does | Assembly combines CRM, a branded client portal, ready-made workflow apps and an AI app builder for professional-service firms. | B12 generates websites, stores, portfolios, blogs, web apps and business tools from prompts, then provides commerce, contacts, email marketing, forms and analytics. |
Plans
Assembly
- FreeFree
- Starter$29 a month
- Professional$99 a month
- Advanced$499 a month
- EnterprisePriced on request
In their own words
Assembly
Assembly combines an AI app builder with a CRM and branded client experience for creating client-facing apps and internal tools. Users describe an app in plain language, review a proposed plan, publish it, and refine it in conversation. More than 30 templates cover workflows such as document collection, project tracking, proposals, and client support. Apps can connect to third-party services through authentication or an API key, and an MCP connector links the workspace to AI tools including ChatGPT and Claude. Workspaces include a branded client experience where published apps appear together. Assembly's platform handles client authentication, roles, permissions, and data scoping. The maker says it is SOC 2 Type II certified, stores customer data in the United States, encrypts it in transit with TLS and at rest with AES-256, and does not use workspace or client data to train AI models. It is not suited to public-facing websites, directories, or consumer apps. A free plan is available; Starter costs $29/mo billed annually.
B12
B12 builds websites and online business tools from a prompt, including stores, portfolios, blogs, web apps, and internal tools. It says a complete site can be drafted in about two minutes, then edited through an AI Agent or visual editor. The platform can draft web pages, blog posts, product descriptions, and emails; sites include SEO structure and built-in analytics. Client features include lead forms, contact management, email campaigns, announcement banners, and exit-intent pop-ups. For commerce, B12 supports online credit card and ACH payments, automated invoice reminders, and branded invoices. Listed integrations include Calendly, Google Calendar, Google Forms, Google Tag Manager, PayPal, Shopify, Typeform, WhatsApp, and WordPress blogs. It also offers access to designers, copywriters, and SEO specialists through a marketplace. B12 runs on the web and requires no software installation; it can be accessed from desktop, mobile, or tablet. A free plan and 7-day trial are available, with paid plans starting at $24/mo. B12 Commerce is available only in the United States; non-US users can use third-party payment tools such as PayPal, Ecwid, or Shopify.