Fast smarter.
Not harder.

A safety-first fasting companion for timers, check-ins, nutrition logging, manual glucose trends, and AI guidance within clear boundaries.

What Fastng supports today

Real app direction

Built for fasting decisions, not medical promises.

Core app

Timers, check-ins, food logging, and completed-fast correction are in the current app scope.

Glucose

Manual trends use values you enter. No CGM or platform glucose read is claimed here.

Voice preview

Local recording lifecycle only; transcription, TTS, and realtime voice are not connected.

Product visuals

Product visuals will keep updating as the mobile app moves through launch preparation.

This preview highlights the product experience without overstating what is available today.

Everything you need to fast safely

Eight tools, one pocket-sized companion.

Smart Timer

Track fasting time, stages, and safe correction flows without implying medical monitoring.

Fasting Science

Your body at every stage

You've been fasting for 18h
How am I doing?
Review symptoms before pushing longer.

AI Coach

Quota and safety boundaries

Mon
Tue
Wed
Thu
Fri
Sat
Sun

Logged Pattern Insights

Logged patterns can help you review fasting rhythm without promising outcomes.

Weight Tracking

Trends and goal progress

Food Logger

Manual log plus scan/search helpers

Safety First

Check in when symptoms show up. Fastng helps you choose safer next steps and does not replace medical care.

Health Sync

Apple Health / Health Connect support for signals like sleep, steps, heart rate, weight, and active energy where available.

Manual glucose

User-entered trends only

Health signals

Supported signals where available

Product visuals

Launch imagery coming soon

A clear preview of Fastng today

See the tools Fastng supports now, plus clear boundaries for platform-specific features that depend on device permissions and availability.

Coming soon

Product visuals

Public app visuals will be refreshed as the mobile experience moves through launch preparation.

Manual only

Manual glucose

Users can enter glucose values and review neutral trends. Fastng does not claim CGM or platform glucose reads.

Supported signals

Health signals

Apple Health / Health Connect support is scoped to available sleep, steps, heart rate, weight, and active energy signals.

Local capture

Voice preview

Voice capture is currently local-only. Transcription, TTS, uploads, and realtime voice are not connected.

Multi-year

Track history

Track can review fasting history across months and years without seeding or inventing production data.

Correction path

Completed fasts

A bounded "forgot to stop earlier" correction flow is implemented for completed fasts.

Conservative

Refeed guidance

Post-fast guidance stays educational and protein-aware, with fallback behavior when richer data is unavailable.

Store truth

Payments

Pricing and Pro access are shown through app/store flows. No fixed trial or unlimited AI promise is made here.

Product visuals: this page uses product-status cards while launch-ready mobile imagery is being prepared.

The metabolic pathway

Every fast moves through broad metabolic phases. This is an educational guide, not medical advice.

0–4h

Anabolic

Nutrients absorbed, glycogen stored

4–16h

Catabolic

Stored energy runs out, metabolism shifts

16–24h

Fat Burning

Fat use can increase as the fast continues. This is where most intermittent fasters aim to reach.

Common target

24–72h

Ketosis

Ketones may rise during longer fasts. Your body produces ketone bodies for sustainable energy.

72h +

Deep Ketosis

Long fasts deserve extra care and clear stop signals. Avoid pushing through symptoms or extending aggressively.

✨Extended fasts

Guidance from logged patterns

Ask for fasting guidance with quota and safety boundaries. The coaching layer can use available app context without claiming diagnosis, treatment, or persistent memory.

Context-Aware Guidance

Logged fasts, check-ins, meals, and supported health signals can help shape relevant educational guidance when available.

🎯

Choose your next fast

Logged-context guidance

Guide

Plan Guidance

Helps you decide, does not auto-change

All clear
Monitor
Take action
🛡️

Safety Escalation

Check-in, caution, safer next step

🌙Meal timing notes stay visible
😴Sleep context can inform review
📈Fast history shows patterns over time

Pattern Recognition

Surfaces logged patterns across meals, sleep, and fast history without promising outcomes or medical interpretation.

Context-Aware Coaching

Uses recent app context

✓
✓
W
✓
✓
✓
S

Weekly rhythm review

Based on logged fasts

Weekly Review

Rhythm, not fake social proof

16:818:620:4

Safer Plan Review

Guidance can help you choose a safer next fast. Fastng does not automatically change your protocol.

Readiness Guidance

Sleep, last meal, symptoms, and weight trend can frame a cautious readiness review before tougher fasts.

Meal Timing

Eating-window planning

😊
😐
😴
💪

Check-In Patterns

Compare notes over time

Simple pricing

Start free. Upgrade when you're ready.

Free

$0/ forever
  • Basic fasting timer
  • Starter fasting plans
  • Weight tracker
  • Daily check-in
  • Fasting zones display
Start Free

PRO

STORE AVAILABILITY VARIES
Shown at checkout

monthly or yearly when available

  • Everything in Free
  • Expanded AI Coach limits
  • Logged pattern insights
  • Food logging helpers
  • Extended fasting plans
  • Manual glucose trend support
  • Data export support
  • Restore and manage access in app
See Pro Options