Comparison

InterFasting vs FitLogOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

InterFasting

This app helps users succeed with intermittent fasting through scientific and systematic management. It offers AI-powered schedule and calorie recommendations, a simple timer, and comprehensive tracking of fasting hours, meals, workouts, and water intake. Users can visualize progress and receive detailed reports to build healthy habits.

Highlights
  • AI fasting schedule recommendations
  • AI food calorie calculation
  • Intermittent fasting timer
  • Customizable fasting plans
  • All-in-one health tracking
  • Fasting analysis and reports
  • Home screen widget
Features
Read full description

Ready to make intermittent fasting actually work? InterFasting is the smart fasting tracker and fasting timer that helps you stay consistent without extreme dieting. No more guessing, no complicated calorie counting — just smart tools that actually work. Why people choose InterFasting • AI Schedule Recommendations Get a personalized intermittent fasting plan based on your lifestyle — no more trial and error. • AI Calorie Counter & Food Scanner Just snap a photo of your meal. Instantly see calories and macros without manual logging. • The Easiest Fasting Timer Supports 16:8, 5:2, OMAD, and fully custom schedules. Smart alarms keep you on track. • 100% Free Customization + Ad-Free Experience Adjust your fasting windows freely and track everything in a clean, distraction-free interface. • All-in-One Health Tracker Monitor fasting hours, weight progress, meals, workouts, and water intake in one place. • Home Screen Widgets Check your fasting stage and countdown timer instantly from your home screen. • Hour-by-Hour Body Stages See what’s happening in your body during a fast (Ketosis, Autophagy, and more). • Visual Progress & Photo Diary Log meals and take progress photos to stay motivated by real results. Science-backed benefits of intermittent fasting Effective fat burning and weight loss Boosted autophagy and cellular repair Better blood sugar control Reduced inflammation Improved mental clarity and energy Perfect if you want to start intermittent fasting for the first time, stay consistent with a reliable tracker, or combine fasting with keto and healthy weight loss goals. Consistency is the key. InterFasting helps you build habits that last. Download now and start your transformation. *** Apple Health Integration *** Automatically syncs weight, steps, and workout data with the Apple Health app. ABOUT SUBSCRIPTIONS & PAYMENT • Payment will be charged to your Apple ID account at confirmation of purchase. • You can manage or cancel your subscription in your App Store Account Settings at any time. • Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Terms of Service: https://www.interfasting.app/service_en Privacy Policy: https://www.interfasting.app/privacy

About

FitLogOS

Read full description

FitLog OS は、減量期でも筋量を守りたい人のためのコンディション判定アプリです。 Apple ヘルスまたは Google Health(Fitbit)から、睡眠、心拍、活動、体重などのデータを読み取り、毎朝ひとつの判定を表示します。Fitbit Air を使う場合は、Google Health 経由で睡眠、歩数、有酸素運動負荷、消費カロリー、安静時心拍、心拍変動を同期できます。 判定は GO / NORMAL / MAINTAIN / RECOVER の4段階です。 GO: 攻めてよい日 NORMAL: 通常運転の日 MAINTAIN: 重量を守り、無理に伸ばさない日 RECOVER: 回復を優先する日 判定に合わせて、今日の筋トレ強度、睡眠アクション、カフェイン、栄養チェック、週次レビューを確認できます。 アプリ内の言語モードは、日本語、英語、簡体中国語、スペイン語、フランス語に対応しています。 FitLog OS は医療診断を行いません。健康・フィットネスの自己管理を補助する情報として利用してください。 Terms of Use: https://backend-blue-delta-79.vercel.app/legal/terms

Screenshots

InterFasting4 screens
FitLogOS4 screens

Verdict

The call

The clearest difference is in-app purchases: FitLogOS at none against InterFasting's 5. FitLogOS also leads on ads (none vs shown). InterFasting's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price and update cadence there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. InterFasting sells 5 in-app purchases, starting at $3.99 per month. FitLogOS asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 29, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 6 level
InterFasting versus FitLogOS: the parameters behind the verdict, then further details
ParameterInterFastingFitLogOS
PriceFreeFree
Rating4.8 (359 ratings) — better—
Positive reviews88.6% of reviews—
Number of ratings359 — better—
Update frequencyEvery 4 daysEvery 4 days
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPod, Apple Watch — betteriPhone
Requires iOS15.0 — better18.0
Further details — not scored
Size99 MB3 MB
Age rating4+4+
DeveloperLivietTaisuke Goto

In-app purchases

5 purchases

InterFasting

Subscriptions4
  • Intermittent Fasting Monthly$3.991 Month
  • Intermittent Fasting Monthly$6.991 Month
  • Intermittent Fasting Annual$12.991 Year
Show 1 more
  • Intermittent Fasting Annual$34.991 Year
One-time1
  • Premium User$12.99
None

FitLogOS

No in-app purchases

Questions

Is InterFasting free?
InterFasting is free to download, with in-app purchases available.
Is FitLogOS free?
FitLogOS is free to download, with no in-app purchases.
Do InterFasting or FitLogOS have ads?
InterFasting shows ads; FitLogOS does not.
Which is updated more often, InterFasting or FitLogOS?
InterFasting ships an update every 4 days, and FitLogOS every 4 days. Most recently, InterFasting was updated on October 29, 2026 and FitLogOS on October 5, 2026.

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