Case study · Fasting & recovery
Kairo Fasting
A calm, private intermittent fasting and recovery app that learns your rhythm instead of nagging you. Built fully native for iPhone and Apple Watch.
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The daily fast is matched to today's recovery — not a fixed timer.
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A metabolic map where every stage links to its source science.
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Stages you earn from your own history — and never lose.
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Recovery is its own quiet space, not a wall of metrics.
The problem
Most fasting apps are one of two things: a blunt countdown timer, or a social feed that turns your body into content. Neither respects the person using it, and neither explains why a fast is worth doing on any given day.
The approach
Kairo treats fasting, movement, and recovery as one loop. It reads your recent training and history, then proposes a window that fits the day — a gentle 12 hours after a hard run, a longer one when you're fresh. Everything runs on device and stays private; there is no feed and no leaderboard.
The science is not decoration. Each fasting stage and every library lesson links to a real, citable source, so a curious user can always check the claim rather than take it on faith.
What shipped
A native iPhone and Apple Watch app in Swift and SwiftUI, with a Live Activity for the running fast, an adaptive daily plan, a sourced fasting-science library, and a companion marketing site at kairofasting.com. It is in beta and in active development.
Contact
Building something in this space? Let's talk.
A sentence or two about your product and timeline is plenty. I reply within two business days.