About

Paul Calver, Precision Nutrition Certified Master Health Coach and iOS developer

I'm Paul Calver. I've been building iOS apps for 15 years, and I'm a certified health coach. I now build health apps that take both crafts seriously.

Coaching credentials

All certifications are from Precision Nutrition, one of the most widely respected coaching-certification bodies in the industry:

Precision Nutrition Certified L2 Master Health Coach
Precision Nutrition Certified L1 Nutrition Coach
Precision Nutrition Certified L1 Sleep, Stress Management & Recovery Coach

You can verify my listing in the official Precision Nutrition certified coach directory.

Engineering

Fifteen years of professional iOS development. Current app work spans HealthKit, the Screen Time API, and complex on-device analysis: the plumbing that health apps depend on and most coaching businesses can't touch.

How I build

The behaviour-change science I trained in is mostly ignored by the apps people actually use. Streaks, guilt loops, and dashboard anxiety are engagement mechanics, not coaching. My apps follow a different set of rules: no streaks that reset to zero, no shame-based copy, honest uncertainty when the data is thin, and evidence from your own life over gamified abstractions.

Elsewhere

I write about agentic coding, health, sleep, stress, and behaviour change on LinkedIn, and canonical versions of everything live in Articles.