100% FREE · NO ADS · NO ACCOUNT · NO SUBSCRIPTION TRAP

Hone your fast.
Zones live on your Island.

Intermittent fasting without the bloat. Metabolic zones from Fed to Deep Ketosis live on your Dynamic Island and Apple Watch complication. Precision fasting for the disciplined.

Download for iOS See the zones
5
Metabolic zones
0
Ads or trackers
$0
Core, forever
— METABOLIC ZONES

Understand every hour.

Not a countdown. Watch your body shift through five metabolic states in real time — rendered in the color the app paints onto your Lock Screen.

0h4h12h18h24h36h+
Zone · 12 — 18h
Fat Burning

The metabolic switch flips. Fat becomes your primary fuel. Energy levels stabilize.

Ring color
#F28D3C
Glow radius
40 px
Island state
Active
Hone app screen showing the current metabolic zone
— SEE IT IN ACTION

Every screen. No surprises.

Hone onboarding screen
Welcome
Hone ready-to-start screen with Begin fast button
Ready
Hone active fast in the Fat Burning metabolic zone
Fat Burning
Hone active fast reaching the Ketosis metabolic zone
Ketosis
Hone history calendar showing past fasts and streak totals
History
Hone settings screen with Precision Window guardrails
Settings
— YOUR DATA STAYS YOURS

Privacy is
the product.

Every other fasting app is a marketing machine wearing a timer. Hone isn’t. The economics of surveillance don’t apply here — there’s nothing to surveil.

No account
Open. Start fasting. That’s it. We don’t know who you are.
No tracking
Zero analytics in the free tier. No Facebook SDK. No cross-app trackers.
No ads
Not now, not ever. The economics of free apps are broken — we pick a different path.
On-device
All fasting data is written to your phone. No server calls. No cloud.
— FAQ

Questions, answered.

Hone is a privacy-first iOS 18 intermittent fasting app built for disciplined fasters. It shows metabolic zones live on Dynamic Island, runs complications on Apple Watch, and enforces hard guardrails through its Precision Window engine. There is no account, no ads, no tracking, and no bloat. The core is free forever; Hone Pro unlocks precision features for $29.99 per year.
For most healthy adults, protocols like 16:8 are generally considered safe, but Hone is not a medical product. People who are pregnant, breastfeeding, underweight, or managing conditions like diabetes or eating disorders should consult a qualified healthcare professional before changing eating patterns. Metabolic zones shown in Hone are educational estimates based on general research, not a clinical diagnosis.
Hone supports the four most common protocols: 16:8, 18:6, 20:4, and OMAD (one meal a day). All four are free — no paywall on the core. Switch protocols anytime; your history is preserved across changes.
Yes — a native watchOS 11 app. Start or end a fast, see remaining time and current zone, and pin a complication to your watch face. The complication reflects Fast Purity state (Clean or Blunted) through shape changes — solid vs dashed, not just color.
No. Zero analytics, zero ads, no account, no server calls for fasting data. Everything stays on your device. No social feeds, coaching chatbots, or Facebook SDK. This isn’t a marketing claim — it is how the app is built.
The core is free forever: all four protocols, zones, Dynamic Island Live Activity, widgets, history, streaks. Hone Pro is an optional $29.99/yr unlock for Precision Window (caffeine cutoff, training-day exceptions, sleep protection, max-fast cap), Fast Purity tracking, and Focus Filter for blocking food-delivery notifications during fasts.

Start your fast.
Hone your edge.

Free, forever. No account. No ads. No excuses.

Download Free on App Store
Not medical advice · Consult a doctor before any extended fast