Comparison

Fastly vs Zazen· Fasting Tracker

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

Head to head
About

Fastly

Features
Read full description

Track your intermittent fasting journey with precision and ease. Fastly helps you achieve your weight loss goals through intelligent fasting tracking, comprehensive analytics, and motivating insights. CORE FEATURES Real-Time Fasting Timer • Precision tracking with circular progress display • Live updates showing elapsed time • See exactly how long you've been fasting • Track remaining time to your goal Fasting Stage Indicators • Digesting (0-4h) - Processing your last meal • Fat Burning (8-12h) - Body burns stored fat • Ketosis (12-16h) - Peak fat burning and mental clarity • Deep Ketosis (16h+) - Maximum benefits and autophagy • Understand what's happening in your body at each stage Weight Loss Tracking • Set your goal weight and track progress • Log daily weight entries • See weekly and monthly changes • Visual progress charts and trends • Motivation through visible results Comprehensive Analytics • Current and longest streaks • Success rate percentage • Week-over-week comparisons • Total hours fasted • Interactive charts (week, month, year views) • Achievement celebrations FASTING PLANS Choose from 6 scientifically-backed fasting schedules: • Circadian (13h) - Align with your body's natural rhythm • 16:8 (16h) - Most popular, beginner-friendly • 18:6 (18h) - Advanced fasting for experienced users • 20:4 (20h) - Warrior diet protocol • 23:1 (23h) - OMAD (One Meal A Day) • 36-hour fast - Extended fasting for advanced practitioners Each plan includes detailed descriptions and recommendations for best results. BEGINNER FRIENDLY • "What can I have?" guide - Know what won't break your fast • Eating window countdown - See exactly when you can eat • Educational onboarding - Learn the science of fasting • Progress celebrations - Stay motivated with achievements • Stage indicators show what's happening in your body ADVANCED FEATURES • Complete fasting history with personal notes • Edit and review past fasting sessions • Customizable reminder system • One-tap weight logging • Session details with stages reached • Smart validation prevents accidental short fasts DESIGNED FOR SUCCESS • Beautiful dark mode interface optimized for OLED displays • Smooth animations and transitions • Intuitive 4-tab navigation (Timer, Weight, History, Profile) • Clean, distraction-free design • Professional health & fitness aesthetic PRIVACY & SECURITY • Your data stays private and secure • GDPR compliant with EU data protection • Secure authentication • Full data control • No data sold to third parties Whether you're starting your first fast or you're an experienced faster, Fastly provides the tools and insights you need to succeed with intermittent fasting and weight loss. Download Fastly and start your journey to better health today. Terms of Use: https://fastlyapp.co/terms Privacy Policy: https://fastlyapp.co/privacy

About

Zazen· Fasting Tracker

Features
Read full description

Zazen· is a mindful fasting tracker built for clarity and intention. Track your intermittent fasting sessions with a beautiful live timer, see exactly which metabolic phase you're in — from Blood Sugar Drop to Autophagy - and get notified at every milestone. FEATURES • Live Activity on your Lock Screen — see your fast progress without opening the app • 8 fasting phases with detailed explanations • Preset fasting plans: 12:12, 16:8, 18:6, 20:4, 36h, 48h and more • Full history with charts and stats • Hydration reminders • Daily fasting reminders • CSV export of your fasting history • Beautiful dark minimal design

Screenshots

Fastly4 screens
Zazen· Fasting Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: Zazen· Fasting Tracker at none against Fastly's 3. Fastly's advantage is device support (3 vs 1) and iOS requirement (13.4 vs 17.0). On price and ads 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. Fastly sells 3 in-app purchases, starting at $14.99 per month. Zazen· Fasting Tracker asks for nothing beyond the download.

Scorecard3 real differences · 3 level
Fastly versus Zazen· Fasting Tracker: the parameters behind the verdict, then further details
ParameterFastlyZazen· Fasting Tracker
PriceFreeFree
Update frequency—Monthly
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.4 — better17.0
Further details — not scored
Size30 MB1 MB
Age rating17+4+
DeveloperZF Solutions ABAshish Minocha

In-app purchases

3 purchases

Fastly

Subscriptions3
  • Fastly Premium - Monthly3 Days trial$14.991 Month
  • Fastly Premium - 3 Months$24.993 Months
  • Fastly Premium - Yearly$59.991 Year
None

Zazen· Fasting Tracker

No in-app purchases

Questions

Is Fastly free?
Fastly is free to download, with in-app purchases available.
Is Zazen· Fasting Tracker free?
Zazen· Fasting Tracker is free to download, with no in-app purchases.
Do Fastly or Zazen· Fasting Tracker have ads?
Neither Fastly nor Zazen· Fasting Tracker shows ads.

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