Why Kairo exists

Fasting advice online is either a countdown timer with no guidance, or an influencer yelling absolutes. We thought there should be a third option: a calm guide that does the thinking with you — and shows its work.

The idea

Most people who try intermittent fasting quit within two weeks — not because fasting is too hard, but because nobody told them the three things that actually matter: how to place the window around their life, what to eat inside it, and how to break a fast without wrecking it. Timers count hours. They don't answer any of that.

Kairo starts from the opposite end. You tell it your goal, your schedule, and how you like to eat; it builds your plan and — this is the part we care most about — explains every recommendation. The protocol, the window, the calorie target, the first foods after a fast: each one comes with its reasoning, in plain language. If a recommendation can't justify itself, it doesn't ship.

The principles it runs on

• Show the why. No black box, no "trust the algorithm." You should finish every session a little smarter than you started.
• Consistency beats intensity. Kairo will tell you to ease off when your week says you should — a gentler plan you keep beats a heroic one you quit.
• Private by design. Your plan lives on your device. Signing in is optional and only exists to sync your program across devices. We don't sell data — we sell a product.
• Grounded, not gimmicky. Calorie targets use the Mifflin–St Jeor equation with safety floors. Guidance is practical and honest — and it's general information, not medical advice.

Who's behind it

Kairo is built by an independent maker in Oregon, USA — not a venture-funded growth machine. The website is the planning and learning home; the Kairo iPhone app (in beta) is the daily companion that tracks your fasts and recovery. Pro subscriptions are what fund development — when you upgrade, you're directly backing the roadmap.

Talk to us

Questions, feedback, something not working, or just want to say hi — email hello@kairofasting.com. A real person reads everything.

Kairo provides general information only, not medical advice. It does not diagnose, treat, or prevent any condition. Consult a qualified professional before changing your diet.