Comparison

Fast & Slim vs Vasten

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

Head to head
About

Fast & Slim

Read full description

Fast & Slim is a simple intermittent fasting timer and weight-loss tracker designed to help you build healthy habits, stay consistent, and feel more in control of your daily routine. Whether you want to lose weight, follow an intermittent fasting plan, create better structure in your day, or simply feel lighter and more balanced, Fast & Slim gives you a calm and easy way to track your progress. Fasting does not have to feel complicated. With Fast & Slim, you can start your fast in seconds, follow your fasting window, check your progress at a glance, and stay connected to your wellness goals with a clean and friendly design. Fast & Slim helps you: - Build a simple intermittent fasting routine - Track your fasting window with ease - Stay consistent with your fasting schedule - Support your weight-loss goals - Follow your daily progress clearly - Create healthier habits over time - Feel more in control of your wellness routine Whether you are just getting started or already following a fasting plan, Fast & Slim gives you a clean and motivating space to stay on track. Use it as your daily fast tracker to follow your fasting time, review your progress, and make each day feel more intentional. Free version includes: - Easy fasting timer - Clear daily tracking - Simple and beautiful interface Premium unlocks: - Ad-free experience - Full fasting history Fast & Slim is perfect for anyone looking for a simple way to stay consistent, feel better, and support healthy weight loss through intermittent fasting. Start gently, stay steady, and make progress one day at a time.

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 automaticallyβ€”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: β€’ One-tap start with an adjustable start time β€’ Custom fasting goals from 1 to 168 hours β€’ Clear widget goal progress and goal end times β€’ Lock Screen and Dynamic Island Live Activity β€’ Small and medium Home Screen widgets β€’ Separate timer and 12-week fasting-activity widgets β€’ Custom accent colors shared across the app and widgets β€’ Editable history and summary statistics β€’ Configurable local goal-time notification β€’ Vasten JSON and Zero fasting-history import β€’ Private device storage with private iCloud synchronization β€’ JSON and CSV export β€’ English and Dutch β€’ No account, ads, analytics, or subscription Stage labels are general educational time ranges. They are not measurements of your body or medical advice.

Screenshots

Vasten4 screens

Verdict

The call

The clearest difference is in-app purchases: Vasten at none against Fast & Slim's 1. Fast & Slim's advantage is iOS requirement (18.6 vs 26.5). On price there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Fast & Slim sells 1 one-off in-app purchase. Vasten asks for nothing beyond the download.

Scorecard2 real differences Β· 4 level
Fast & Slim versus Vasten: the parameters behind the verdict, then further details
ParameterFast & SlimVasten
PriceFreeFree
Update frequencyβ€”Every 2 days
Adsβ€”No
In-app purchasesYesNo β€” better
Devicesβ€”iPhone β€” better
Requires iOS18.6 β€” better26.5
Further details β€” not scored
Size7 MB2 MB
Age rating4+4+
DeveloperSergi FranquetDennis Van Dalen

In-app purchases

1 purchases

Fast & Slim

One-time1
  • Fast & Slim$0.99
None

Vasten

No in-app purchases

Questions

Is Fast & Slim free?
Fast & Slim is free to download, with in-app purchases available.
Is Vasten free?
Vasten is free to download, with no in-app purchases.

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