Comparison

FastKit vs Aayu

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

Head to head
About

FastKit

Features
Read full description

Take control of your health and embrace simplicity with FastKit: Fasting Timer!  Designed to make intermittent fasting effortless, this clean and intuitive app helps you track your fasting windows, monitor progress, and stay motivated on your journey to better health. Why Choose FastKit: - Simple to Use: Minimalist design ensures easy navigation and setup. - Customizable Plans: Tailor your fasting schedules to fit your lifestyle. - Progress Tracking: See your fasting streaks and milestones. - Gentle Reminders: Stay on track with friendly notifications. Whether you’re a beginner or an experienced faster, FastKit is your ultimate companion for mindful fasting and a healthier life. Simplify your fasting journey! Terms of Use: https://www.fastkit.app/tos Privacy Policy: https://www.fastkit.app/privacy-policy

About

Aayu

Track your body's metabolic zones in real-time during fasting to understand progress beyond simple timers. Offers personalized plans, hydration tracking, and curated meal ideas to support your weight loss journey. Advanced features are available through an optional subscription.

Highlights
  • Real-time metabolic zone tracking
  • Personalized fasting plans
  • Curated break-fast meal suggestions
  • Hydration and step tracking
  • Metabolic discipline score
  • Learn library of fasting articles
Features
Read full description

Lose weight with intermittent fasting — and see when your body actually switches to fat burning. Most fasting apps show you a countdown. Aayu tracks six metabolic zones in real time, from the drop in glucose through fat burning, autophagy, and renewal. Fasting stops feeling like waiting and starts feeling like progress toward your goal weight. From the moment you begin a fast, Aayu tracks your body's journey through six metabolic zones in real time — from the early transition away from glucose, through the metabolic shift, into fat burning, autophagy, and renewal. At every stage, you'll see where you are, what your body is doing, and what comes next. Fasting stops feeling like waiting and starts feeling like progress. YOUR METABOLIC DISCIPLINE SCORE Aayu distils your fasting practice into a single score built from what genuinely matters: how long you fast, how consistently you show up, how well your fasts align with your natural overnight rhythm, how often you reach the deeper zones, and the momentum of your streak. PLANS THAT MEET YOU WHERE YOU ARE Start gently with 12:12 and progress to 14:10, 16:8, or 18:6 — free, forever, with no hidden limits. Aayu builds your starting plan around your profile, activity, and last-meal time, and includes safety guardrails: gentler plans are recommended for younger users and those at lower body weights. BREAK YOUR FAST PROPERLY How you end a fast matters as much as the fast itself. Aayu includes 30 curated break-fast meals — from steamed idli with coconut chutney to overnight oats and miso soup — each chosen for being gentle on a fasting gut, with an explanation of why it works and protein-forward options to help protect muscle. EVERYTHING ELSE YOU NEED, FREE - Real-time fasting timer with live zone tracking - Hydration tracking with one-tap quick-adds - Automatic step counting - Weight logging with trends - Personalised coaching cards for your first week and beyond - "Does it break my fast?" — a searchable reference for coffee, tea, sweeteners, supplements and more - A Learn library of clear, practical fasting articles - Smart reminders for fast start, milestones, and hydration - Cloud sync and full account deletion, anytime GO DEEPER WITH AAYU PRO When you're ready, Aayu Pro adds: - 30-day and all-time insight ranges - Smart Weight Projection based on your real fasting, weight, and activity data - Monthly PDF reports with score breakdown and next-month plan - Apple Health integration — see how fasting relates to your resting heart rate, HRV, sleep, and body composition - Advanced metrics including fat-burn estimates, deep autophagy hours, and gut rest - Advanced plans: 20:4, OMAD, 36-hour, 5:2, and 4:3 - Custom plans with weekday and weekend variation Pro is available as a monthly or annual auto-renewing subscription, managed through your App Store account. Cancel anytime. PRIVATE BY DESIGN Your health data is yours. Aayu runs on EU-based infrastructure, shows no ads, never sells your data, and lets you delete your account and data from within the app. A NOTE ON YOUR HEALTH Aayu provides general wellness information, not medical advice. Advanced metrics are estimates based on published research, not clinical measurements. Fasting isn't suitable for everyone — if you are pregnant, under 18, underweight, diabetic, or managing a medical condition, consult your doctor before fasting. Always take prescribed medication on schedule. Begin your first fast tonight — and for the first time, watch what your body does with it. Terms of Use : https://www.aayuwellness.app/terms Privacy Policy: https://www.aayuwellness.app/privacy

Screenshots

FastKit4 screens
Aayu4 screens

Verdict

The call

The clearest difference is in-app purchases: Aayu at none against FastKit's 6. On price, update cadence, ads and device support 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. FastKit sells 6 in-app purchases, starting at $1.99 per 7 days. Aayu asks for nothing beyond the download.

UpkeepUpdate frequency

FastKit ships an update every 5 days, Aayu every 4 days. The most recent releases landed on October 7, 2026 and October 18, 2026 respectively.

Scorecard1 real difference · 9 level
FastKit versus Aayu: the parameters behind the verdict, then further details
ParameterFastKitAayu
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 5 daysEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Freemium
DevicesiPhoneiPhone
Requires iOS17.616.4 — better
Further details — not scored
Size10 MB77 MB
Age rating17+17+
DeveloperAnatoli NiculeacAayu Wellness Ltd

In-app purchases

6 purchases

FastKit

Subscriptions6
  • 3-Day Trial3 Days trial$1.997 Days
  • Premium Weekly$2.997 Days
  • Monthly$2.991 Month
Show 3 more
  • Premium Monthly$9.991 Month
  • Yearly Plan$14.991 Year
  • Premium Yearly$34.991 Year
None

Aayu

No in-app purchases

Questions

Is FastKit free?
FastKit is free to download, with in-app purchases available.
Is Aayu free?
Aayu is free to download, with no in-app purchases.
Do FastKit or Aayu have ads?
Neither FastKit nor Aayu shows ads.
Which is updated more often, FastKit or Aayu?
FastKit ships an update every 5 days, and Aayu every 4 days. Most recently, FastKit was updated on October 7, 2026 and Aayu on October 18, 2026.

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