Assembly

What it is

Assembly is an AI app builder for authenticated applications rather than public products. You describe an internal tool or a client portal to its AI, and it builds a working app that your team uses in a dashboard while each client gets their own view inside your branded client experience. The home page pitches it as "The AI app builder for real businesses, not weekend projects", and the FAQ states the focus plainly: "Assembly builds apps for authenticated experiences", meaning your team and your logged-in clients. The site speaks to professional and service firms, accounting practices and agencies among them, and its blog describes Assembly as a client portal and CRM built for service businesses.

The company says every app has 2 sides. That model, a team side and a client side in one product, is the core of what Assembly sells: apps "with secure client logins, permissions, and per-client personalization", ready to use with clients from day one, with "No code, no hosting, no auth to wire up."

What you build and how

Building by conversation. The home page describes 4 steps: describe, plan, publish and iterate. The FAQ says the builder asks a few product questions, shows you a plan you approve or edit, and then builds. The demo on the home page shows the builder asking whether a new time tracking app will be visible to clients or stay internal-only, which is the 2-sided model at work from the first question. Changes happen the same way, by conversation, and apps are not frozen at publish: you keep chatting with the app builder to refine anything whenever your workflow changes, such as adding color-coded approval statuses or a weekly total.

What you can build. The FAQ answers "What can I actually build?" with 2 kinds of apps: client-facing apps and internal tools. The examples it lists are onboarding wizards, document collection, project trackers, approval workflows and client dashboards. Apps can use AI too, and the example given is an assistant that answers client questions from your firm's own docs. The home page gallery adds a client help desk, a time tracker, a document collector, a proposal builder with pricing and e-signature, and a new client intake app. The company says client-facing apps are where Assembly is strongest.

Templates. The FAQ says there are 30+ app templates covering common workflows and specific industries, from accounting document collection to agency approval flows. Start from one and it is yours: you reshape it by chat until it fits how your firm works.

The platform underneath. The home page argues that "Generation is the easy part." Every workspace comes with a branded client experience on your own domain, and apps ship straight into it, "with no URLs to wrangle, no hosting, no downtime." Each app appears in a sidebar next to the others you have built or installed, so clients move between small, focused apps in one place instead of one large app. Around the builder, Assembly lists an integrated CRM, the client experience, authentication, roles and permissions, notifications, workflows, ready-made apps, an API and MCP, integrated payments and security. The company's blog adds that client records hold custom fields, internal notes and a private team chat, that Storefronts let you sell services or subscriptions through a branded checkout, and that the Assembly Assistant summarizes client conversations, notes and files before a meeting.

Integrations. The FAQ says apps can connect to any third-party service. When you build an app that needs one, the app builder prompts you to authenticate the tool or provide an API key, and it is wired in from there. The company's client dashboard guide says Assembly integrates with tools like Airtable, Calendly and ClickUp, with more connections through Zapier and Make, and the footer links an API reference.

Sign-in and permissions. The company says security on Assembly is "platform infrastructure, not something the AI generates." Clients sign in with magic links or Google, with MFA on top, and authentication is "powered by Assembly, never generated by AI." Roles and permissions are maintained by the platform, and a structural boundary separates what your team sees from what your clients see, so "no prompt can cross it." For anyone worried that a prompt could widen access by accident, that design choice is the main selling point. Per-client personalization goes further: the white-label guide says you can adjust layout and app visibility per client using custom field tags.

Ownership. The FAQ says you own what you build, meaning your data, your logic and your workflows, and that the company never uses your apps, your data or your clients' data to train AI models and does not share them with anyone.

Plans, security and proof

Pricing. The FAQ says "Start free, stay free": the free plan never expires and lets you build and publish real apps, and the closing banner repeats "Free forever" and "No credit card required." Every plan includes a set number of apps and monthly build credits for creating and editing them, and you upgrade for more apps, more credits and more capability. The company's client dashboard guide says paid plans start at $29 per month billed annually, and its white-label guide says the portal runs without any Assembly branding on Advanced plans.

Compliance. The company's white-label guide says "Assembly maintains SOC 2 Type II compliance and supports GDPR, CCPA, and HIPAA compliance." The footer also links a Trust center, a status page, an AI policy and a page of information for language models.

Customer proof. The home page features Garrett Advertai Marketing, quoted as saying "We've built out apps within weeks that I doubt we could have done within five to ten years before," with 5 weeks from development to launch, 200+ clients using the applications and 5+ tools consolidated. Those are one firm's figures.

Support and learning. You can book a demo or start directly. Resources include a blog, a guide, an API reference, a "What's new" log and a community, and there is a desktop app.

Who it suits and who it does not

Assembly suits a professional firm, an agency or a service business whose clients need to log in to hand over documents, approve work, follow a project, pay an invoice or see a dashboard, and whose team wants a private side to manage it. The conversation-first build means a non-technical founder or an operations lead can describe the workflow without hiring a developer, and the 30+ templates give a starting point for common cases such as document collection or approval flows. The free plan never expires, so a firm can build and publish a first portal before deciding whether to pay.

It is the wrong tool for a public site. The company says so itself: "Marketing websites, public directories, and consumer apps are better built elsewhere." And because plans meter apps and monthly build credits, a firm planning many client portals should match its plan to the number of apps it expects to run.