Tools and websites for a select few.

Cold Harbor is an AI-native design agency. Sebastian Selling runs it. We take on a handful of clients and build things that ship.

How we work

Simple rules. No mystery process.

We work with a handful of clients at a time. That means your project gets attention, not a queue.

Tools and websites people actually use. Not decks, not prototypes that collect dust.

Sebastian Selling runs Cold Harbor and leads every engagement. You always know who is on the hook.

A few things we have built or are building now.

Proactive stewardship for high-value property portfolios. Invite-only. Live and in use.

Inspect in the field. Follow up in the portal. Live defect lists, not PDF email chains.

Building inspections for construction and property in Sweden. Live and in use.

Technical property management for Stockholm housing associations. Live and in use.

We are selective. A short note helps us decide if there is a fit.