Why we built CalCoach
Jack was coaching Mike. They were looking for a simple way for coaches to see what clients were eating and where they struggled, but nothing truly fit. So they built it. Mike brought the client perspective and technical know-how, and Jack brought the coach perspective and got the Northern UK fitness community behind the mission. And CalCoach was born.
Calorie trackers track. They don't coach. Every food tracking app was built for individuals who are already motivated — not for a personal trainer keeping 30 clients accountable, or a gym improving member retention without a full-time nutritionist.
The real problem isn't the calories. It's the gap between the client's behaviour and the coach's visibility. We built CalCoach to close that gap: a food diary the client actually uses, a dashboard the coach can actually see, and an AI nutrition coach available 24/7 when the human coach isn't.
Founders
Jack Slinn
CEO & Co-Founder
Former fitness coach, semi-pro footballer, and serial founder with an elite fitness network. Jack is a lifelong fitness enthusiast who brought the coach perspective and the Northern UK fitness community to CalCoach.
Jack leads the go-to-market, coaching community, and fitness product at CalCoach. He uses the platform with his own clients — everything he ships gets tested in the real world first.
Mike Fort
CPO & Co-Founder
Mike struggled with his weight from a young age, reaching nearly 118kg at his heaviest. After years of stop-start dieting, the breakthrough came when he stopped chasing willpower and found a better fuel: accountability. The support of a good friend solidified the lifestyle change — and losing 35kg (5st 7lbs) gave him a clear mission.
Not everyone has the good fortune of living with a PT. Mike set out to use technology to provide that same round-the-clock accountability. He brought a decade of product experience to making his idea for CalCoach a reality. Mike's mission is to help anyone who's let themselves down time and again — we're built to do hard things together; we just weren't taught how.
Where we're based
CalCoach Ltd is based in Manchester, United Kingdom. We work with people trying to get and stay in shape, as well as personal trainers, online coaches, and gyms — worldwide.
What CalCoach does today
CalCoach is live on the App Store and Google Play. It is used by personal trainers and online coaches across the UK, primarily as a nutrition layer alongside existing training platforms like Trainerize and Everfit. Gyms use it to run member-wide nutrition challenges and provide 24/7 AI nutrition accountability.
Features include: Cal nutrition coach, voice and photo food logging, coach dashboard, PDF reports, client nudges, challenges, meal plans, recipe library, Apple Health / Garmin / Whoop / Apple Watch integration, and a free coach-finder listing for every coach on the platform.
How to get in touch
For general enquiries: hello@calcoach.com
For coaching or gym demos: book a call here.
We're also on Instagram: @calcoachforcoaches for coaches and @calcoachapp for clients.