Assembly.com

Assembly is an AI app builder for businesses that serve clients. Describe the app you need, approve the plan, and Assembly builds it into your workspace with client sign-in, permissions, payments and your branding already handled. Keep refining it by chat after it goes live.

Every workspace also includes a built-in CRM, a branded client portal and 30+ ready-made apps for intake, onboarding, proposals, payments and project tracking, each of which can be remixed to fit your workflow. Agencies, consultants, accountants and other service firms use Assembly to give every client one branded place to message the team, share files, sign contracts and pay invoices.

Sign-in, permissions and data isolation are platform infrastructure rather than AI-generated code, every app runs in its own sandbox, and Assembly is SOC 2 Type II certified. There is a free forever plan, with paid plans that add custom domains, more apps and monthly build credits.