You're about to find out how much of your life was built around avoiding it.
Open any of them and you will find a timer marching toward autophagy at 16 hours. There is no primary human source for that hour. Not a weak one — none. Here is where it actually came from:
And the human studies point somewhere between ambiguous and the wrong way. A 72-hour fast raised one autophagy marker 30% — and raised p62 10% at the same time, which is the signature of blocked flux, not active. A 36-hour study saw all three markers fall. The authors of the first one said outright they could not interpret it.
Sample blood ketones every six hours through a long fast and the curve is not a ramp. It is flat, and then it is not.
That flat stretch — hour 12 to 18 — is exactly where the industry puts its "ketosis begins" badge. 16:8 is a perfectly good protocol. It is not a ketosis protocol, and we think saying so is more interesting than a fake milestone.
The last number is the one nobody in this category prints. We are not selling you weight loss, because the evidence will not carry it, and you would find out in eight weeks.
Each stage carries a visible confidence chip — how good the evidence actually is, shown to you rather than hidden behind a progress ring. Nothing below grade B ships. There is no autophagy hour and no autophagy gauge, because we cannot put a number on it honestly.
Hour 14 is built deliberately as the moment the app tells you what the other apps are doing.
Hunger arrives in waves of 20 to 60 minutes, locked to the times you habitually eat. It is not a fuel gauge. It is a schedule you learned.
That is the thing fasting is genuinely best at, and it is what this app is built around: you find out how much of your day is running on triggers you did not choose. Every crash in our research corpus happened during idleness, not exertion — one man sailed through twenty hours and cracked the second he sat down in a restaurant. So the hunger tool is a twenty-minute walk, not a motivational quote.
Bodyweight, hours in, sweat and keto adaptation — answered in teaspoons of table salt, because that is the unit you can act on. Deliberately lower than what you will read online, and it shows you why.
A twenty-minute tool for the moment you want to quit. Walking is the intervention, because walking is what actually worked in the corpus.
Put the phone down for ten hours and it tells you what you crossed while you were away, instead of pretending it never happened.
Six breaths a minute and a physiological sigh — the two that won their head-to-heads. Box breathing and 4-7-8 lost theirs, so they are not here.
Get the hard part over with before the fast. Sodium loss peaks on days one to four and settles by about day fourteen — so it happens on a Tuesday instead of during hour 30.
Which week you are most likely to finish the fast you planned — framed as difficulty, never as chemistry. No trial has ever fasted women in one phase and compared it to another, and the tool says so.
Everything stays on your device. There is nothing you have to sign up for, no analytics, and no third-party SDK watching you fast. If you ever want your history on a second phone, an account is there to switch on — and the app works exactly the same without one. You can export the whole history to a file whenever you want, and import it back.
It installs to your home screen and works with no connection at all.
Every word exists twice, written natively in English and Spanish to the same intent — not run through a translator. Where Spanish has the better idea, the Spanish wins and the English gets rewritten to match. A brand whose whole claim is honesty cannot ship calqued sentences.
The research behind it is public inside the app: 13 documents, roughly 97,000 words, around 500 sources, and five long-form articles that show their work.
Not a trial, not a demo, not a teaser with the good parts locked. The timer, all twelve stages, the safety gate, the electrolyte doses, the coach, the cycle tool, the planning, the breathing, every article, both languages, and your data exported whenever you want it.