Comparison

Fastly vs Vasten

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 helps you track intermittent fasting with a clean interface, customizable plans, and motivational features. Monitor your body's response through different fasting zones and visualize progress with charts and widgets. Your data remains private, stored locally or optionally via iCloud.

Highlights
  • Customizable fasting plans (16:8, OMAD, etc.)
  • Real-time circular timer and zone tracking
  • Motivational streaks, badges, and calendar heatmap
  • Weight tracking with trend visualization
  • Home screen widgets and Live Activities
  • Optional iCloud sync and CSV export
Features
Read full description

Intermittent fasting, without the clutter. Fastly is a clean, private fasting timer built for people who want to stick to 16:8, OMAD, or any plan they choose — with beautiful widgets, real-time zone tracking, and zero ads or accounts. Start a fast in one tap. Watch your body move through five fasting zones — from catabolism to deep autophagy. Build streaks, earn badges, and see your progress in charts that actually make sense. FASTING, YOUR WAY • Pick from 16:8, 18:6, 20:4, OMAD, 5:2, or build a custom plan • Live circular timer with elapsed, remaining, and target • Edit past fasts or log a forgotten one manually • End a fast by voice with the Siri shortcut SEE YOUR BODY'S RESPONSE • Five fasting zones: Anabolic, Catabolic, Fat Burning, Ketosis, Autophagy • Clear guide explains what's happening at each stage • Gentle notifications when you enter a new zone STAY MOTIVATED • Streaks and weekly summaries • 20 unlockable badges for consistency and milestones • Calendar heatmap shows every fast at a glance • Full history with notes on each session TRACK YOUR WEIGHT • Log in kg or lbs in one tap • Visualize trends over weeks, months, or years • Combined timeline of fasts and weight changes WIDGETS + LIVE ACTIVITIES • Home Screen widgets in Small, Medium, and Lock Screen sizes • Live Activity keeps your fast visible on the Lock Screen and Dynamic Island • Real-time countdown and zone status — no need to open the app YOUR DATA STAYS YOURS • Optional iCloud sync across iPhone and iPad • No account, no ads, no tracking • CSV export anytime (Pro) FASTLY PRO Unlock the full experience: • Unlimited history (free tier shows last 30 days) • Widgets • Trend, Eating Window, Fasting Pattern, and Weight charts • 30-day and yearly insights • CSV export of all your data PRIVACY FIRST Your data lives on your device (and optionally your private iCloud). We don't collect, sell, or share anything. Ever. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://23apps.org/privacy/fastly

About

Vasten

Features
Read full description

Vasten does one job well: it keeps an accurate record of your fast. Start in one tap, see elapsed time and your goal on the main screen, and keep the timer visible through a Home Screen widget, Lock Screen Live Activity, and Dynamic Island. Reaching the goal never ends the fast automatically—you decide when it ends. Your history remains useful and under your control. Correct start and end times, review simple totals, import Vasten JSON or Zero history, export everything as JSON or CSV, or delete any record. Features: • One-tap start with an adjustable start time • Custom fasting goals from 1 to 168 hours • Clear widget goal progress and goal end times • Lock Screen and Dynamic Island Live Activity • Small and medium Home Screen widgets • Separate timer and 12-week fasting-activity widgets • Custom accent colors shared across the app and widgets • Editable history and summary statistics • Configurable local goal-time notification • Vasten JSON and Zero fasting-history import • Private device storage with private iCloud synchronization • JSON and CSV export • English and Dutch • No account, ads, analytics, or subscription Stage labels are general educational time ranges. They are not measurements of your body or medical advice.

Screenshots

Fastly4 screens
Vasten4 screens

Verdict

The call

The clearest difference is in-app purchases: Vasten at none against Fastly's 1. Vasten also leads on update cadence (every 2 days vs every 3 months). Fastly's advantage is device support (3 vs 1) and iOS requirement (17.0 vs 26.5). 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 1 in-app purchase, starting at $2.99 per year. Vasten asks for nothing beyond the download.

UpkeepUpdate frequency

Fastly ships an update every 3 months, Vasten every 2 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 5 level
Fastly versus Vasten: the parameters behind the verdict, then further details
ParameterFastlyVasten
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS17.0 — better26.5
Further details — not scored
Size6 MB2 MB
Age rating4+4+
DeveloperTejas PatelDennis Van Dalen

In-app purchases

1 purchases

Fastly

Subscriptions1
  • Fastly Pro$2.991 Year
None

Vasten

No in-app purchases

Questions

Is Fastly free?
Fastly is free to download, with in-app purchases available.
Is Vasten free?
Vasten is free to download, with no in-app purchases.
Do Fastly or Vasten have ads?
Neither Fastly nor Vasten shows ads.
Which is updated more often, Fastly or Vasten?
Fastly ships an update every 3 months, and Vasten every 2 days. Most recently, Fastly was updated on October 24, 2026 and Vasten on October 6, 2026.

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