Comparison

Fastyn vs VOID

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

VOID

This AI-powered coach visualizes your fasting progress, from blood sugar depletion to fat burning. Log meals instantly with photo recognition or voice commands, and receive personalized nutrition and exercise advice. Gamified motivation and smart hydration tracking help build healthy habits.

Highlights
  • AI-powered nutrition coaching
  • Visualized fasting progress
  • AI meal logging via photo/voice
  • Deep Apple Watch integration
  • Personalized nutrition advice
  • Gamified motivation and rewards
  • Smart hydration tracking
Features
Read full description

VOID isn't just another fasting app — it's your AI-powered nutrition coach. [Science-Based Fasting, Visualized] Track your fasting progress in real time — from blood sugar depletion to fat burning and cellular autophagy. Every metabolic stage is clearly displayed with dynamic breathing glow animations that let you feel your body's rhythm. [AI Photo Recognition — Log Meals in 3 Seconds] Snap a photo and AI instantly identifies food types, estimates calories, protein, carbs, and fat. Don't want to take a photo? Just say "a bowl of rice and a fried egg" — AI understands instantly. [Deep Apple Watch Integration] Everything on your wrist — fasting countdown, today's calorie rings, voice meal logging, and one-tap water tracking. 4 watch face complications keep your fasting status visible at a glance. [6 Stunning Home Screen Widgets] From cyber-punk to fresh nature, from macaron-cute to Apple Vision spatial style — there's always one to brighten your home screen. [AI Personal Coach] Based on your fasting history, diet records, and weight trends, your AI coach delivers personalized nutrition advice and exercise guidance daily — not templates, but plans truly made for you. [Gamified Motivation] Build streaks, earn "Cell Coins," and unlock achievement badges. Discipline doesn't have to be boring — every day of consistency is celebrated. [Smart Hydration Tracking] Set daily goals, log water with one tap, and watch your progress ring fill up. Staying hydrated becomes a habit. [Privacy First] All data stays on your device. We never upload, analyze, or sell your health data. Your body data belongs to you, and only you.

Screenshots

Fastyn4 screens
VOID4 screens

Verdict

The call

The clearest difference is in-app purchases: VOID at none against Fastyn's 3. VOID also leads on update cadence (every 2 weeks vs every 3 months). On price, ads, device support and iOS requirement 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. VOID asks for nothing beyond the download.

UpkeepUpdate frequency

Fastyn ships an update every 3 months, VOID every 2 weeks. The most recent releases landed on September 27, 2026 and September 3, 2026 respectively.

Scorecard2 real differences · 7 level
Fastyn versus VOID: the parameters behind the verdict, then further details
ParameterFastynVOID
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhoneiPhone, Apple Watch — better
Requires iOS17.617.0 — better
Further details — not scored
Size35 MB50 MB
Age rating17+17+
DeveloperMANUEL MATAS GALEOTE河南雀科信息科技有限公司

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
None

VOID

No in-app purchases

Questions

Is Fastyn free?
Fastyn is free to download, with in-app purchases available.
Is VOID free?
VOID is free to download, with no in-app purchases.
Do Fastyn or VOID have ads?
Neither Fastyn nor VOID shows ads.
Which is updated more often, Fastyn or VOID?
Fastyn ships an update every 3 months, and VOID every 2 weeks. Most recently, Fastyn was updated on September 27, 2026 and VOID on September 3, 2026.

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