About
Under-promise, over-deliver. Still.
Celsius Software has been building business software in the UK for more than twenty-five years — from some of the country's largest FileMaker solutions to the AI automations and websites we build for Oxfordshire businesses today.
What has changed, and what has not
The tools have changed enormously. We started with bespoke databases, added web development, and now build AI-driven automations that would have been science fiction when we began. What has not changed is the approach: understand the business first, deliver something usable early, and be straight about what things cost and how long they take.
We are deliberately small. You deal with the person doing the work, not an account manager relaying messages. That is also why we turn work down — we would rather say no than deliver badly.
Everything we build belongs to you. No rented websites, no proprietary frameworks only we understand, no reason to stay with us other than wanting to.
25+ years
Building business systems for UK clients.
Bicester based
Oxfordshire work face to face; UK work remotely.
Three disciplines
AI automation, search-first websites, Claris FileMaker.
One point of contact
The person you speak to is the person who builds it.
Coverage
Where we work
Automation and website clients are concentrated around Bicester and the surrounding Oxfordshire and Buckinghamshire towns. FileMaker development runs nationwide.
- Bicester
- Oxford
- Banbury
- Kidlington
- Buckingham
- Brackley
- Witney
- Aylesbury
- Woodstock
- Thame
- Milton Keynes
- Abingdon
Start with a conversation, not a proposal.
Tell us the problem. If we can help, we will say how. If we cannot, we will usually know someone who can.
Talk to us