Comparison

Fastly vs Just Fasting

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

Head to head
About

Fastly

This app provides a clean and distraction-free timer for intermittent fasting. It tracks your fasting periods in real-time, offers various popular fasting plans, and automatically monitors fasting phases like fat burning and ketosis. View your history with clear statistics and receive smart reminders.

Highlights
  • Clean fasting timer with real-time tracking
  • Multiple intermittent fasting plans
  • Automatic fasting phase tracking
  • Fasting history with statistics
  • Smart reminders for goals
  • Minimalist interface
  • Dark mode support
Features
Read full description

Fastly is a clean, private fasting timer for 16:8, 18:6, OMAD, and custom schedules—without ads, accounts, or distractions. Start a fast with one tap, adjust your start or end time when needed, and see your elapsed time, remaining time, and planned finish at a glance. Fastly keeps the experience focused while giving you the tools you need to understand your routine and track your progress. FOLLOW YOUR FAST See estimated fasting phases based on your elapsed fasting time, including digestion, fat burning, ketosis, and autophagy. Upcoming phase markers make it easy to see what comes next during your fast. TRACK YOUR PROGRESS Review your complete fasting history through clear statistics, charts, and progress insights. Set weight and body fat goals, and optionally connect Apple Health to keep your measurements organized. STAY ON TRACK EVERYWHERE Follow your fasting status from your iPhone, Apple Watch, Home Screen widgets, and complications. Smart reminders help you stay aware of fasting goals and eating windows without unnecessary interruptions. KEY FEATURES • Real-time fasting timer with elapsed and remaining time • Planned fasting end time displayed at a glance • 14:10, 16:8, 18:6, 20:4, OMAD, and custom plans • Estimated fasting phases for digestion, fat burning, ketosis, and autophagy • Upcoming fasting phase markers • Complete fasting history with statistics and charts • Weight and body fat goals with progress benchmarks • Apple Health integration for weight and body fat • Apple Watch app and complications • Home Screen widgets for quick progress checks • Smart fasting and eating-window reminders • Optional private iCloud synchronization • Dark mode and a clean, focused interface PRIVATE BY DESIGN No ads. No third-party analytics. No developer data collection. Your fasting and health information stays on your devices and, when optional synchronization is enabled, in your private iCloud account. IMPORTANT NOTE Fasting phases are estimates based on elapsed time and can vary from person to person. Fastly is intended for general wellness and fasting tracking only. It does not provide medical advice, diagnosis, or treatment. Consult a qualified healthcare professional before making medical or dietary decisions.

About

Just Fasting

Features
Read full description

ust Fasting is built to stay out of your way. Open the app and start fasting—no clutter, no noise. Start fasts your way • 16-hour fast — one tap, last meal is now (adjust if you need to). • Custom fast — pick hours (1–72) or longer fasts in days (4+), with no upper limit on days in the picker. • Last meal time defaults to now but you can change it if you finished eating earlier. Stay oriented A large countdown and an arc show how far you’ve come through your fast. When you hit your goal, wrap up with a tap. See your progress Statistics include total fasts, total time fasted, average length, longest fast, current streak, and best streak. The app remembers your last fast length so starting the same routine again is quick.

Screenshots

Fastly4 screens
Just Fasting3 screens

Verdict

The call

The clearest difference is in-app purchases: Just Fasting at none against Fastly's 4. Just Fasting also leads on update cadence (every 2 days vs every 10 days). Fastly's advantage is iOS requirement (17.6 vs 26.4). On price, 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. Fastly sells 4 one-off in-app purchases. Just Fasting asks for nothing beyond the download.

UpkeepUpdate frequency

Fastly ships an update every 10 days, Just Fasting every 2 days. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

Scorecard3 real differences · 7 level
Fastly versus Just Fasting: the parameters behind the verdict, then further details
ParameterFastlyJust Fasting
PriceFreeFree
Rating4.8 (92 ratings) — better—
Positive reviews94.1% of reviews—
Number of ratings92 — better—
Update frequencyEvery 10 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, Apple WatchiPhone, iPad
Requires iOS17.6 — better26.4
Further details — not scored
Size9 MB2 MB
Age rating12+4+
DeveloperCollweb LLCMatthew Clark

In-app purchases

4 purchases

Fastly

One-time4
  • Coffee$1.99
  • Lunch$4.99
  • Become a Supporter$4.99
Show 1 more
  • Dinner$9.99
None

Just Fasting

No in-app purchases

Questions

Is Fastly free?
Fastly is free to download, with in-app purchases available.
Is Just Fasting free?
Just Fasting is free to download, with no in-app purchases.
Do Fastly or Just Fasting have ads?
Neither Fastly nor Just Fasting shows ads.
Which is updated more often, Fastly or Just Fasting?
Fastly ships an update every 10 days, and Just Fasting every 2 days. Most recently, Fastly was updated on September 23, 2026 and Just Fasting on September 18, 2026.

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