Comparison

Fastyn vs ZenithFast

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

Head to head
About

Fastyn

Features
Read full description

Fastyn is the fastest and most elegant way to track your fasts. Forget complicated menus and manual setup: just choose how many hours you want to fast, tap “Start”, and let the app handle the rest. Designed with a modern glassmorphism style, smooth animations, and thoughtful personalization, Fastyn turns intermittent fasting into a clear, visual, and motivating experience you can rely on every day. What makes Fastyn different is its smart logic. The app doesn’t just start a timer, it helps you start at the right moment. Smart Start suggestions - Based on the current time and your habits, Fastyn suggests the best moment to begin your fast, such as “Tonight” or “Tomorrow morning”. - You also get clear, persuasive reasons like “Ideal for relaxing before sleep”, so it’s easier to stay consistent without overthinking. Live physiological phases - During your fast, Fastyn shows your estimated fasting stages in real time, such as fat burning, ketosis, or autophagy, directly on the home screen and widgets. - You always know where you are in your fasting journey at a glance. What you can do with Fastyn - Free duration: set any number of hours (for example, 8 h, 12 h, 20 h…) and start your fast instantly. - Live timer: track elapsed time, estimated calories burned, and fasting progress with an intuitive visual chart. - Estimated calories: see an estimate of how many calories you may have burned during your fast. - Smart cards: keep your key metrics (fasting phase, BMI, streaks, goals, and more) always visible on the main screen. - Weight log: record your measurements, explore interactive charts, and project your progress toward your goals. - Fasting calendar: review your daily and multi-day fasting history to understand your consistency over time. - Smart notifications: receive end-of-fast alerts, hydration reminders, and motivational tips to stay on track. - Customizable widgets: monitor your progress from your Home Screen without opening the app. Set your hours, tap “Start”, and experience fasting in a simple, intelligent, and visual way. Privacy Policy: https://sites.google.com/view/fastikk-privacidad/home Terms of Service: https://sites.google.com/view/fastikk-terminos

About

ZenithFast

Features
Read full description

Reach Your Peak with Fasting & Hydration. ZenithFast is the clean, distraction-free fasting and water tracker designed to help you achieve peak energy, mental clarity, and lasting results. Whether you practice intermittent fasting for weight loss, water fasting, or simply want to optimise your health, ZenithFast delivers a simple yet powerful experience — with beautiful visual tools that keep you focused and motivated. WHY FAST WITH ZENITHFAST? • Burn fat more efficiently while boosting natural energy and recovery — no restrictive diets or intense workouts needed. • Support your body's natural processes: elevated growth hormone, sharper brain function, and better overall wellness. • Stay hydrated effortlessly during fasting windows to avoid fatigue and maximise benefits. • Skip complicated calorie counting — just focus on clean fasting with intuitive timers and smart water tracking. Fasting done right with proper hydration is one of the most natural ways to lose weight, simplify your routine, and feel your best every day. ZenithFast makes it effortless. KEY FEATURES Beautiful Fasting Timer — Watch your fasting window flow smoothly with our elegant visual countdown. Every fast feels intentional and motivating. Personalised Fasting Plans — Choose from 12:12, 14:10, 16:8, 18:6, 20:4, 5:2, OMAD, 36-Hour, and Warrior Diet protocols — or build a fully custom schedule to fit your lifestyle. Integrated Water Tracker — Gentle reminders to hydrate during your fast. Proper hydration unlocks better energy, focus, and fasting results. Smart Reminders & Notifications — Never miss your fasting start, fasting end, or water intake with subtle, non-intrusive alerts. Insights & Progress Analytics — Beautiful charts showing your fasting streaks, hydration consistency, weight trend, and long-term improvements. Health Metrics — Connect Apple Health to track resting heart rate, HRV, sleep, and energy alongside your fasting data. Ad-Free & Minimalist Design — A sleek, focused interface with zero distractions. Perfect for beginners and seasoned fasters who want simplicity. FASTING PLANS INCLUDED Beginner: 12:12, 14:10, 16:8 Intermediate: 18:6, 20:4, 5:2 Expert: OMAD, 36-Hour Fast, Warrior Diet Custom: Build your own daily or weekly fasting schedule ZENITHFAST PREMIUM Unlock the full power of ZenithFast Premium: • All fasting plans including OMAD, 5:2, and Expert protocols • Unlimited history and advanced analytics • Custom fasting plan builder • Priority support Premium subscription options: • Monthly subscription • Yearly subscription (best value) Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. Manage your subscription in your Apple ID Account Settings. Any unused portion of a free trial will be forfeited upon purchase of a subscription. Terms of Use: https://zenithfast.app/terms Privacy Policy: https://zenithfast.app/privacy-policy Reach your zenith. Fast clean. Hydrate deep. PRIVACY POLICY: https://zenithfast.app/privacy-policy LICENSE AGREEMENT By downloading this app you agree to the Apple End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Fastyn4 screens
ZenithFast4 screens

Verdict

The call

The clearest difference is ads: Fastyn at none against ZenithFast's shown. ZenithFast's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.6). On price and in-app purchases 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. Fastyn sells 3 in-app purchases, starting at $1.99 per 7 days and ZenithFast sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Scorecard3 real differences · 3 level
Fastyn versus ZenithFast: the parameters behind the verdict, then further details
ParameterFastynZenithFast
PriceFreeFree
Update frequencyEvery 3 months—
AdsNo — betterYes
In-app purchasesYesYes
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size35 MB56 MB
Age rating17+4+
DeveloperMANUEL MATAS GALEOTELunar Pixel

In-app purchases

3 purchases

Fastyn

Subscriptions3
  • Fastyn Plus Weekly$1.997 Days
  • Fastyn Plus Monthly$3.991 Month
  • Fastyn Plus Annual7 Days trial$17.991 Year
2 purchases

ZenithFast

Subscriptions2
  • Premium Monthly3 Days trial$4.991 Month
  • Premium Annual3 Days trial$39.991 Year

Questions

Is Fastyn free?
Fastyn is free to download, with in-app purchases available.
Is ZenithFast free?
ZenithFast is free to download, with in-app purchases available.
Do Fastyn or ZenithFast have ads?
ZenithFast shows ads; Fastyn does not.

Other comparisons