The AI app builder made for service businesses
Describe what you want. Assembly builds a working app with logins, permissions, and branding.
What AI app builders promise. What Assembly proves.
Plenty of tools can generate something that looks like an app. Assembly builds one your clients and your team can actually use.
Client apps and internal tools, one place
Describe it once. Client apps go to clients, team tools to your dashboard.
One CRM behind every app
Contacts, companies, custom fields. Clients see only what you allow.
Secure logins, permissions, billing built inSecure logins, permissions, billing built in
Maintained by Assembly. Clients see nothing until you make it visible.
New apps land already branded
Your logo and colors, not ours — every app picks them up.
How it works
Describe
Say what you want, or start from a template.
Add a shared calendar each client books their own time on.
Three ways to get a custom app. One is ready to use
All three produce an app. Only one is ready for your clients and your team on day one.
- Time to a tool
- Minutes to a working app
- Ready on day one?
- Yes
- Logins and permissions
- Built in
- Client data
- One shared CRM
- Maintenance
- Handled by Assembly
Not a builder? Start here
20+ templates made for businesses like yours. Install one, then remix it with the builder.
Browse all templatesFirms already building
“What excites me is how our partner data collected in Assembly flows directly into our internal quality control processes.”
“I’m already starting to see myself get hours back each week, because there’s less maintenance and fewer things I need to stay on top of. The apps are doing a lot of this themselves.”
“We had more tax returns in the door, ready to start being prepped, earlier than ever this year than in our entire history.”
“Assembly saves us from building custom portals from scratch. We can go fast and create lasting value for the businesses we serve.”
Frequently asked questions
No. Describe what you want, or start from a template. Assembly asks a few clarifying questions and shows a plan you approve or edit, and then it builds. Changes after launch happen the same way, by continuing the conversation, with no coding at any step.
Assembly has a free plan that never expires, and you can build and publish working apps on it. Paid plans add more apps and your own domain for the client experience. Full details are on Assembly's pricing page.
Yes. Logins and permissions on Assembly are built and maintained by Assembly's team, not generated by the AI for each app. Clients sign in with Google or a secure one-click email link, and multi-factor authentication is available on every plan, with enforced MFA on Advanced plans. Each client sees only their own data. Full details are on Assembly's security page.
Most AI app builders generate a working prototype and stop there, leaving logins, hosting, and client data for the person building it to figure out. Assembly's AI app builder comes with that layer built in: logins for your team and your clients, permissions, a CRM, your branding, and a built-in billing option. What gets built is an app your business can use right away, for your clients or your team, rather than a prototype that still needs to be finished. See Assembly's comparison pages against Lovable and Base44 for a feature-by-feature breakdown.
Nothing reaches your clients until you've approved the plan and made the app visible to them. New apps stay hidden from clients by default while you test. If something needs fixing after launch, keep chatting with the app builder to change it.
Public marketing websites. Assembly's AI app builder is built for apps people log into, meaning your team and your clients, not anonymous visitors on the open web. A public website is better built with a different tool and linked from inside your client experience.
For a service business, the best AI app builder does more than generate a prototype: it comes with the pieces that make an app usable by a team or a paying client, meaning logins, permissions, branding, and a place for client data. Assembly is built for agencies, accounting and bookkeeping practices, law offices, and consultancies. Describe the app, or start from one of its templates, and Assembly builds a working app for your team or your clients with that layer already included.
General-purpose vibe coding tools like Lovable or Replit generate a working prototype at a separate URL that still has to be secured, hosted, and connected to client data before a customer can use it. Assembly's AI app builder is built for client-facing apps: describe the app, approve the plan, and it publishes into a branded client experience that comes with Assembly, with client logins and permissions already handled.
Your next app,
built this afternoon
Skip the five-figure custom build.
Describe what you need, or start from a template.