About
Why we built this
The internet runs on thousands of small tools that millions of people rely on every day. Many are poorly maintained or full of ads, but people use them because they have to. Casomo exists because of that gap — instead of building ever larger systems, we build focused tools that solve specific problems and stand on their own.
NHS financial tools came first because we hit the problem ourselves. Working out what an NHS pension is worth — and how it changes under different scenarios — turned out to be genuinely difficult. The information is spread across multiple documents. The assumptions behind most online calculators aren't shown, so you can't tell whether the answer applies to your situation. We started building the tools we wanted to use ourselves.
Who we are
David Mohamad
Founder
I founded Casomo. My background spans physics R&D, medical robotics, defence systems, and fintech — the common thread is building software where getting it wrong has real costs. I now apply the same rigour to tools ordinary people use every day.
Hannah Paten
Contributor
I lead communications and stakeholder engagement at a major NHS trust, spanning healthcare, academia, and the wider public sector. My work focuses on shaping strategic messaging and building relationships with key stakeholders to support organisational priorities.
Our promise
No ads, no data sales, no affiliate commission. We track how people use the tools so we can improve them, but that data stays with us — no third-party tracking, no advertising pixels, no analytics services reselling your behaviour. If we can't verify a number, we don't publish it. If we get one wrong, we fix it and say so.
Contact
Spotted a mistake? Want a tool we haven't built? Disagree with how we've modelled something?
Email us