About ONE Intermittent Fasting App

What ONE is

ONE is a mobile app for iOS and Android that supports common intermittent fasting routines. Depending on the account tier, it includes:

• A fasting timer with Quick Start durations of 16, 19, 24 and 36 hours, plus a Custom Timer for any duration you choose.
• Fasting history for completed sessions longer than 12 hours.
• Streak tracking and daily consistency signals.
• Water tracking and weight tracking over time.
• Apple Health integration on iOS and Health Connect integration on Android.
• Protein tracking with natural-language food entry (Premium).
• An AI Coach powered by OpenAI that provides weekly and monthly analysis of your logged fasting patterns (Premium).

For a fuller product overview, see the ONE Intermittent Fasting App page.

ONE is a lifestyle and wellness tracking tool. It is not medical software, it is not a diagnostic device, and it does not measure your biological state directly.

Who is behind ONE

ONE Intermittent Fasting App is operated and published by Create Rush LLC, a company registered in Delaware, United States.

Educational articles and guides on fastingtime.co are written and maintained by the ONE Editorial Team, the editorial identity Create Rush LLC uses for fasting information published on this website.

How we approach fasting information

Fasting research is evolving and biological responses vary between individuals. We try to reflect that honestly in everything we publish. Our guiding principles are:

• Base educational content on established medical institutions, public-health resources, and peer-reviewed research where appropriate.
• Use hedged language ("may", "some people", "varies between individuals") where the underlying biology is genuinely variable.
• Distinguish evidence-based claims from simplified educational explanations designed to make progress easier to follow.
• Treat the hour-based stages, phases, and progress signals in the app as educational estimates, not measurements of a user's biology.
• Avoid guarantees about health outcomes, weight loss, or precise physiological timing.

ONE does not measure insulin, glucose, glycogen, ketosis, autophagy, or fat oxidation. It does not diagnose or treat health conditions, and it does not prescribe how long you should fast.

Our editorial approach

Articles on fastingtime.co are prepared by the ONE Editorial Team using guidance from established medical institutions (such as Johns Hopkins Medicine, Mayo Clinic, and Cleveland Clinic), major public-health resources, and peer-reviewed research (typically indexed via PubMed) when the topic warrants primary evidence.

In practice this means we:

• Prioritise established scientific and clinical sources over popular blogs or forums.
• Cite sources inline where a specific factual claim relies on them.
• Review and update articles when meaningful new evidence or product behaviour changes.
• Aim to correct factual errors when readers or reviewers identify them.

We do not claim that every article is reviewed by a physician. Where medical judgement is required, we point readers toward qualified healthcare professionals rather than trying to substitute for them.

AI Coach transparency

ONE Premium includes an AI Coach powered by OpenAI. It analyses the information you have already tracked inside the app — fasting sessions, patterns, and logged data — and surfaces weekly and monthly insights to help you stay consistent.

The AI Coach is not a doctor, dietitian, or other medical professional. Its responses are informational only. It should not be used for diagnosis, treatment decisions, medication changes, or emergency guidance. If something about your health feels wrong, contact a qualified healthcare professional rather than the AI Coach.

Health information disclaimer

Information provided by ONE Intermittent Fasting App and on fastingtime.co is for general educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.

Please talk to a qualified healthcare professional before starting or changing an intermittent fasting routine, especially if you have a medical condition, are taking medication affected by food intake, are pregnant or breastfeeding, or have a history of an eating disorder.

See our Terms of Service for the full health disclaimer and our Privacy Policy for how personal data is handled.

Get in touch

For product support, privacy questions, corrections to published articles, or general inquiries, contact the ONE team through our contact page.