# KETHOS — Extended Fasting, Done Right > Extended fasting companion with live timeline, education, and guided refeeding. (iPhone/iPad app by Strategic Services Group, LLC.) - Source: https://appshunter.io/ios/app/kethos/id6761673720 (this page in markdown: same URL + `.md`) - Developer: [Strategic Services Group, LLC](https://appshunter.io/developer/1405602576) - Category: Health & Fitness, Productivity - Price: Free - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 3 MB - Languages: American English - Released: 2026-05-06 - Data updated: 2026-06-26 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/kethos/id6761673720/reviews.md ## What is KETHOS? Kethos is the extended fasting companion built for people who are serious about going beyond 16:8. Whether you're chasing fat loss, deep autophagy, an immune reset, or longevity, Kethos guides you through every hour of your fast — from the metabolic switch at 12 hours to stem cell activation past day five — with a clean, focused timer and education grounded in the latest research. Powered by American Fitness. THE FASTING TIMELINE, LIVE Watch your body move through six distinct phases as you fast: • Fed State (0–12h) — Glycogen depletion • Fat Burning (12–24h) — The metabolic switch • Ketosis (24–48h) — Autophagy activates • Deep Ketosis (48–72h) — Brain on ketones • Autophagy (72–120h) — Peak cellular cleanup • Stem Cells (120h+) — Deep regeneration Each phase shows your estimated ketone levels, growth hormone response, autophagy activity, and what's happening in your body — so you always know why you feel the way you do. BUILT FOR EXTENDED FASTS Most fasting apps stop at 24 hours. Kethos starts there. Choose a custom fast anywhere from 24 hours to 10 days, or pick a preset for your goal: • Fat Loss — 16–24h fasts, 2–3× per week • Cellular Repair — 24–48h fasts every 2 weeks • Immune Reset — 72+ hour quarterly fasts • Metabolic Health — Daily 16:8 • Longevity — Mixed protocol with periodic extended fasts GUIDED REFEEDING Breaking an extended fast matters as much as the fast itself. Kethos walks you through a structured refeeding protocol so you reintroduce food safely and protect the work you put in. LEARN AS YOU FAST A built-in education library covers what every extended faster should know: • What autophagy actually is • Why electrolytes make or break a long fast • Understanding ketosis and BHB • Refeeding syndrome and how to avoid it • Sleep changes during fasting • When exogenous ketones help — and when they don't CHECK IN WITH YOURSELF Log how you feel during your fast with quick symptom check-ins. Track energy, hunger, mental clarity, and any side effects so you can fine-tune future fasts. YOUR FASTING JOURNEY • Streaks and completion tracking • Full history of every fast you've completed • Shareable summary cards for milestone fasts • Phase milestone notifications so you never miss the moment your body shifts gears Kethos is powered by American Fitness. Learn more at american.fitness. Kethos is for educational and tracking purposes only. Extended fasting is not appropriate for everyone. Consult a qualified healthcare provider before beginning any fasting protocol, especially fasts longer than 24 hours, or if you are pregnant, breastfeeding, taking medication, or have a medical condition. ## Key features - Extended fasting timer - Live fasting timeline with 6 phases - Customizable fasts up to 10 days - Guided refeeding protocols - Educational library on fasting science - Symptom and feeling check-ins - Fasting streaks and history ## Frequently asked questions about KETHOS ### What is KETHOS? KETHOS is a health and fitness application designed to guide users through extended fasting periods. It provides a detailed timeline of bodily changes during a fast, educational content, and structured refeeding advice. ### What are the benefits of using KETHOS? KETHOS helps users understand their body's response to fasting, from glycogen depletion to stem cell activation. It supports goals like fat loss, autophagy, immune reset, and longevity by providing research-backed guidance. ### Can KETHOS be used for short fasts? While KETHOS is built for extended fasts (24 hours to 10 days), it also supports daily 16:8 fasting for metabolic health. Users can choose custom fast durations or select presets based on their goals. ### How does KETHOS educate users? KETHOS includes a built-in educational library covering topics such as autophagy, electrolytes, ketosis, refeeding syndrome, and sleep changes during fasting. This helps users understand the science behind their fasting journey. ### Does KETHOS track user progress? Yes, KETHOS tracks fasting streaks, completion history, and provides shareable summary cards for milestone fasts. It also offers phase milestone notifications to keep users informed of their progress. ### What devices does KETHOS support? KETHOS is available on iPhone and iPad, making it accessible to a wide range of Apple users interested in health and fitness tracking. ### Is KETHOS suitable for all users? Extended fasting is not appropriate for everyone. KETHOS advises users to consult a qualified healthcare provider before beginning any fasting protocol, especially fasts longer than 24 hours, or if they have specific health conditions. ### How often is KETHOS updated? The latest version of KETHOS is 1.1.3, and it was last updated on May 8, 2026. This indicates a commitment to ongoing development and improvements. ## Version history (last 2 releases) ### 1.1.3 — 2026-05-08 updated logo ### 1.1.2 — 2026-05-06 No release notes. ## More apps by Strategic Services Group, LLC - [Vet Emojis](https://appshunter.io/ios/app/vet-emojis/id1394501339) - [Highest Vote](https://appshunter.io/ios/app/highest-vote/id1532096499) - [Smokey Maps](https://appshunter.io/ios/app/smokey-maps/id1607041633) - [Dr. Economy](https://appshunter.io/ios/app/dr-economy/id6760091185) All apps by Strategic Services Group, LLC: https://appshunter.io/developer/1405602576 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-26.*