FitFast - 간헐적 단식, 체중 감량 기록 타이머

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About this app

■ Timers are free forever

Fasting timers, a 6-step metabolic zone timeline, records and calendars, weekly achievement rates, weight and water tracking, and export and backup features.

FitFast does not lock down any of these features that other apps sell for a fee.

It is a promise that we will not hold your body's records hostage.

■ If a company dinner is scheduled, we will move the window for you.

Try entering "Company dinner tonight at 7:30 PM."

We will tell you where to move the meal window to ensure you can sit there while staying on time,

why we calculated it that way, and even how to get back to your normal rhythm over the next few days.

Overtime, lunch appointments, weekend brunches, travel, workouts—we calculate based on actual schedules.

If the schedule is longer than the meal window, we also suggest alternatives such as "Lower your goal for today" or "Eat only for the latter part of the schedule."

■ It doesn't drop to zero even if you miss a day

FitFast does not have consecutive days. It views achievement rates on a weekly basis.

We recognize it as an achievement even if you only meet 92% of your goal.

If you miss the target the next day, we will show you how to get back on track, such as, "If you delay your first meal by one hour, this week's average will return to normal." This is to ensure you don't overexert yourself trying to stick to the numbers.

■ So, What Should You Eat?

We will tell you what is best to eat first after finishing your fast.

You need to start differently for 16-hour and 24-hour fasts.

We guide you toward foods you actually reach for, such as seaweed soup, porridge, and soft tofu, and we also explain why you should eat slowly after exceeding 24 hours.

■ We Will Show You Why We Make These Suggestions

We will review your records from the past two weeks and suggest whether to raise or lower your goal for the following week.

We will then lay out the basis for that decision—achievement rate, average fasting time, and fluctuations in your start time—exactly as it is.

Please apply it only after you have understood and accepted it.

The weekly report identifies recurring patterns, such as, "Friday is the weak link."

It is often a scheduling issue, not a matter of willpower.

■ Safety First

Fasting isn't good for everyone.

If you are pregnant or breastfeeding, under 18, have a history of eating disorders, Type 1 diabetes, or are underweight

FitFast automatically turns off goal time suggestions and coaching. You can continue using your timer and records.

You can also read about signs to stop and precautions for fasting for more than 24 hours right within the app.

It displays a warning if you lose more than 1% of your body weight in a week.

■ Records Only on This Device

Fasting time, weight, hydration, and health status—they are not sent to a server.

No account is required. All features work perfectly fine even in airplane mode.

You can export your entire record as CSV or JSON at any time. It doesn't prevent you from moving to another app.

You can set your start and end times to past times at any time.

To prevent situations like, "I ate last night, but the timer shows 30 hours,"

the app notifies you first if the timer goes significantly past your goal.

■ Key Features

· 6 Metabolic Zones — Digestion · Glycogen · Fat Metabolism Switch · Ketones · Cell Recycling · Deep Fasting

· 12:12 / 14:10 / 16:8 / 18:6 / 20:4 / OMAD / 5:2 / Every Other Day / Custom

· Freely adjust start and end times, add past fasts

· 90-day calendar with weekly progress, rhythm stability

· Weight trend line (EMA) with speed loss warnings, water and condition logs

· Schedule Rescheduler · Adaptive Plan Coach · Weekly Reports · Zone Stay Analysis

· FitFast Score — Consistency · Goal Reach · Rhythm · Resilience

· Device Notifications — Entering Zone, 1 Hour to Goal, Goal Achieved, End Confirmation

· First Meal Guide, CSV/JSON Export, Backup & Restore

· Dark Screen Default · Bright Screen Support

■ FitFast Pro

Unlimited Schedule Rescheduler, Adaptive Plan Coach, Weekly Reports, Zone Stay Analysis,

Weight-Fasting Correlation Analysis, Ad Removal.

Even if you cancel your subscription, your accumulated records remain intact, and viewing, editing, and exporting continue to be free.

The only features locked by Pro are interpretation and coaching functions.

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FitFast is not a medical device and is not intended for the diagnosis, treatment, or prevention of any disease.

The information provided by the app is based on generally known facts and is not medical advice for individuals.

Please consult a medical professional regarding any health decisions.

Developer: Xrabbit

Contact: mingtoki@gmail.com

Privacy Policy: https://fitfast.justgets.com/privacy
The intermittent fasting timer is free forever. It moves the meal window if a company dinner is scheduled, and brings it back even if you miss a day.
Updated on
Aug 17, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • No data collected
    Learn more about how developers declare collection

What’s new

FitFast 첫 출시입니다.

· 단식 타이머와 6단계 대사 구간 — 영원히 무료
· 회식·야근이 생기면 식사창을 어디로 옮길지 계산해 드립니다
· 연속일수 대신 주간 달성률 — 하루 놓쳐도 0이 되지 않습니다
· 공복을 마친 뒤 무엇부터 먹으면 좋은지 안내
· 시작·종료 시각을 지난 시각으로도 자유롭게 수정
· 체중 추세선·수분·컨디션 기록, CSV·JSON 내보내기
· 기록은 이 기기 안에만 — 계정도, 서버 전송도 없습니다

임신·수유 중, 만 18세 미만, 섭식장애 이력, 1형 당뇨, 저체중이신 경우 목표 제안과 코칭을 자동으로 끕니다. 타이머와 기록은 그대로 쓰실 수 있습니다.