Comparison

ByteFast vs JustFast

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

Head to head
About

ByteFast

Features
Read full description

ByteFast is a premium, minimal fasting companion designed to help you reach your metabolic health goals with precision and style. Whether you're a beginner or an experienced faster, ByteFast provides the tools you need to stay consistent and informed. Key Features: Proactive Fasting Coach: Real-time insights into your body's metabolic phases—from feeding and transition to fat burning and autophagy. Live Activities & Dynamic Island: Track your progress directly from your Lock Screen or Dynamic Island without ever opening the app. Interactive Home Screen Widgets: Stay motivated with beautiful ring views and a 14-day activity heatmap that visualizes your consistency. Seamless iCloud Sync: Your fasting data is securely backed up and synced across all your devices automatically. Flexible Scheduling: Choose from proven presets like 16:8 and OMAD, or create custom fasting windows that fit your lifestyle. Premium Haptics: Feel your progress with carefully tuned haptic feedback for milestones and goal completion. Take control of your health with ByteFast—the fast, smart, and beautiful way to track your intermittent fasting journey.

About

JustFast

This app offers a straightforward intermittent fasting timer. It focuses on tracking your fast with a clear, calm interface, providing insights into metabolic stages without gamification or pressure. It prioritizes privacy with on-device data storage and no accounts.

Highlights
  • One-tap start and stop
  • Live timer with accurate timekeeping
  • Metabolic milestone tracking
  • Plain-language explanations of milestones
  • Adjustable start/stop times
  • Ongoing notification for duration
  • Simple history of past fasts
  • 18 languages and dark design
Features
Read full description

Fasting is a beautifully simple intermittent-fasting timer that does one thing well: it tracks your fast. No goals to hit. No streaks to protect. No accounts, no ads, no clutter. Just tap once to begin, and a calm live timer counts your fast while a glowing ring fills toward the next stage your body moves through. WHY IT'S DIFFERENT Most fasting apps pile on dashboards, reminders, and pressure. This one strips fasting back to its essence — a clear timer you can glance at and put away. It's designed to feel quiet and focused, not gamified. WHAT YOU GET • One-tap start and stop, with a big, satisfying button • A live timer that keeps perfect time across restarts, time-zone changes, and daylight saving • Metabolic milestones — the ring fills toward the next stage (blood sugar settling, glycogen burning, fat burning, ketosis, autophagy, and more) • Tap any milestone for an honest, plain-language explanation of what's happening in your body • Forgot to start the timer? Just tap the ring to fix your start time. Forgot to stop? End your fast at the right time after the fact. • An ongoing notification shows your current duration at a glance • A simple history of past fasts — swipe to delete • 18 languages and a clean dark design HONEST BY DESIGN The milestone descriptions are written plainly and honestly. Where the science is still early or based mostly on animal research, we say so. This app is a timer and an educational companion — not medical advice. PRIVATE BY DEFAULT Your data stays on your device. There are no accounts, no sign-ups, no tracking, and nothing is uploaded. Fasting works for 16:8, OMAD, alternate-day, extended fasts, or any schedule you like — because it never forces a schedule on you. Note: Fasting is not a medical device and does not provide medical advice. Talk to a healthcare professional before starting any fasting regimen, especially if you are pregnant, nursing, taking medication, or have a medical condition.

Screenshots

ByteFast4 screens
JustFast4 screens

Verdict

The call

ByteFast and JustFast are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

ByteFast ships an update weekly, JustFast fortnightly. The most recent releases landed on September 26, 2026 and September 28, 2026 respectively.

ScorecardNo meaningful differences
ByteFast versus JustFast: the parameters behind the verdict, then further details
ParameterByteFastJustFast
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyWeekly — betterFortnightly
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS18.018.0
Further details — not scored
Size10 MB20 MB
Age rating4+4+
DeveloperBYTESEED LLCVitalii Vyrodov

In-app purchases

None

ByteFast

No in-app purchases

None

JustFast

No in-app purchases

Questions

Is ByteFast free?
ByteFast is free to download, with no in-app purchases.
Is JustFast free?
JustFast is free to download, with no in-app purchases.
Do ByteFast or JustFast have ads?
Neither ByteFast nor JustFast shows ads.
Which is updated more often, ByteFast or JustFast?
ByteFast ships an update weekly, and JustFast fortnightly. Most recently, ByteFast was updated on September 26, 2026 and JustFast on September 28, 2026.

Other comparisons