You're using SDFC
SDFC is a free tool we publish to help designers keep client projects consistent — sane defaults and enough structure to start well. It is not our framework. The frameworks we actually build on are licensed, confidential, and come with working together.
The framework hierarchy
SDFC is a free tool anyone can use. The three frameworks below it are what Stacklumen actually builds on — licensed or confidential, and progressively more capable. Access widens as we work together.
A free starter tool for keeping client projects consistent. Not a framework.
The template library. Sold under its own licence.
The agency framework. Every client project starts here.
The Stacklumen framework. Never licensed or published.
Work with us
No form yet — choose a path and we'll ask only what's relevant to it. Fixed proposals within seventy-two hours, weekly demos until launch, and full code ownership at handover.
Marketing sites, CMS-driven content, brand systems. Built on SDF, handed over editable.
Start a site brief →Portals, dashboards, billing, automation. Production applications on a modern stack.
Scope an application →Hosting, maintenance and a standing engineering partner rather than a one-off build.
See care plans →Already build for clients? Pass on the projects you don't take and earn 20% of what we collect.
Become a partner →Ownership and confidentiality
Free for unlimited personal and commercial projects. No attribution, no fee. You may not resell or redistribute SDFC itself as a template, clonable, course or component library.
The template library, sold under its own licence. Use in your projects as that licence permits. Not included with SDFC and not sublicensable.
The agency framework applied to client work. Disclosed only under the confidentiality terms of our Master Service Agreement. It is a trade secret, remains Stacklumen property, and may not be reused, extracted or shared beyond the engagement.
Stacklumen's own framework, powering our products. Never licensed, sold, published or disclosed — to clients or anyone else.
SDFC™, SDF™, SAF™, SLF™ and Stacklumen™ are unregistered trademarks of Stacklumen, claimed under common law. No trademark rights are granted by any tier — build with SDFC freely, but do not use the marks to name or promote your own product. SAF and SLF are maintained as trade secrets and are protected by contract rather than by public licence. © 2026 Stacklumen. All rights reserved. Full terms at /copyright, /legal and /msa.
