About Vellum
The people who shape the built environment deserve tools worthy of the work.
Every road, building, site plan, utility layout, permit set, and field revision carries real weight. Behind every drawing are decisions that affect budgets, schedules, communities, safety, and trust.
Yet too often, the professionals doing this work rely on tools that feel slower than their thinking, heavier than their process, or disconnected from the way design actually happens.
Vellum was created to change that.
We are building a modern workspace where plans, drawings, annotations, measurements, and ideas come together with the speed of a sketch, the discipline of engineering, and the polish of a product people actually enjoy using.
Vellum is built for the moments when ideas need to move clearly: from markup to decision, from review comment to action, from early design thinking to finished documentation.
Mission
To equip people with tools to communicate design intent with precision, accuracy, and speed.
Vision
We see a world where design moves at the speed of thought, not the speed of the revision cycle, and nothing is lost between the idea and what's built.
Purpose
Because the decisions engineers make shape the communities we all live in, we're here to give them tools worthy of that responsibility.
What we value
Clarityover complexity
Craftover clutter
Trustover shortcuts
Serviceover ego
Progressover perfection
Courageover comfort
Who's building Vellum
Ross Tsantoulis, P.E., Founder
Vellum is founded by Ross Tsantoulis, P.E., an engineer with 19 years of experience across infrastructure design, drawing review, and construction.
After years of working inside the gap between drawings, decisions, and field outcomes, Ross started Vellum to build the review tool he always wanted: precise enough to trust, fast enough to think in, and designed for the way AEC professionals actually work.
Drawing Review, Reimagined.
Vellum brings clarity, speed, and precision to design review.