Comparison

FastZen vs Marble

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

Head to head
About

FastZen

This app helps you manage your intermittent fasting journey with custom schedules, progress tracking, and smart reminders. Achieve your weight loss and energy goals with a clean, intuitive interface and motivational features.

Highlights
  • Custom fasting schedules (16:8, 20:4, OMAD, up to 168 hours)
  • Progress tracking with history, streaks, and insights
  • Smart reminders for fasting start and end times
  • Achievements and milestones for motivation
  • Calendar view of completed fasts
  • Light and dark mode
  • Widgets
Read full description

Fasting made simple — and actually enjoyable. FastZen is a beautifully designed intermittent fasting tracker that helps you reach your goals with 16:8, 18:6, 20:4, OMAD and extended fasts. Whether you want to lose weight, build healthier habits or simply feel better, FastZen keeps you motivated from your first hour to your finish line. WHY YOU'LL LOVE FASTZEN • EFFORTLESS TRACKING — Start any fast in one tap. A live countdown and a smooth progress ring show exactly where you are. • LOCK SCREEN & DYNAMIC ISLAND — Follow your fast at a glance with Live Activities, without even opening the app. • APPLE HEALTH SYNC — Fasting sessions and your weight are saved to Apple Health automatically. • BODY TRACKING — Log your weight and water intake and watch your progress trend over time. • 16 PROTOCOLS + CUSTOM PLANS — From beginner-friendly 12:12 and 16:8 to 24, 48 and 72-hour fasts — or create your own schedule. • SMART REMINDERS — Get notified when your eating window opens and closes, and never miss the end of a fast. • CHALLENGES & STREAKS — Stay consistent with weekly challenges and keep your streak alive. • PROGRESS YOU CAN SEE — Weekly charts, a calendar heatmap and clear stats show how far you've come. • PRIVACY FIRST — Your fast is hidden when you switch apps, and you can export your data anytime. HOW IT WORKS 1. Answer a few quick questions so we can tailor a plan to your goals. 2. Pick your protocol — 16:8, 20:4, OMAD or fully custom. 3. Start your first fast and let FastZen handle the rest. FASTZEN PREMIUM FastZen is a subscription app. Every plan begins with a 7-day free trial, and you can cancel anytime in your App Store account settings before the trial ends. Your fasts, history and progress stay saved across all your devices via iCloud. Terms of Use: https://sites.google.com/view/mefjudevllc/terms-conditions Privacy Policy: https://sites.google.com/view/mefjudevllc/privacy-policy

About

Marble

This app provides a focused space to log and track your gym workouts. It allows you to build templates, record sets with previous numbers visible for progressive overload, and add notes or photos to each session. Your training history is presented like a journal, with data synced across devices.

Highlights
  • Build workout templates
  • Log sets with previous numbers
  • Progressive overload tracking
  • Rest timer with live countdown
  • Journal-style workout history
  • Attach photos to workouts
  • Cross-device syncing
Features
Read full description

Marble is a training journal — a quiet, considered place to record your work in the gym. LOG Build workout templates and log sets as you train. Your previous numbers sit right in the fields, so progressive overload is one glance away. Reorder exercises with a touch, and let the rest timer run — with a live countdown in the Dynamic Island and a bell that rings even when your phone is locked. RECORD Every workout becomes an entry: name it, add a note, attach a photo. Your training history reads like a journal, not a spreadsheet. TRACK Follow the lifts that matter. Bodyweight and key movements over time, arranged how you want. CARRY IT Your record is backed up to your account and syncs across devices. Sign in with Apple or email; never lose a rep. No feed. No streaks. No noise. Just the work, and what you make o

Screenshots

FastZen3 screens
Marble4 screens

Verdict

The call

The clearest difference is in-app purchases: Marble at none against FastZen's 5. Marble also leads on iOS requirement (17.0 vs 26.0). FastZen's advantage is ratings volume (9 vs 2). On price, rating, 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. FastZen sells 5 in-app purchases, starting at $1.99 per 7 days. Marble asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for FastZen against 5.0 for Marble. Both are backed by a comparable volume of ratings — 9 and 2 respectively.

Scorecard4 real differences · 5 level
FastZen versus Marble: the parameters behind the verdict, then further details
ParameterFastZenMarble
PriceFreeFree
Rating5.0 (9 ratings)5.0 (2 ratings)
Number of ratings9 — better2
Update frequencyEvery 5 days—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhoneiPhone, iPad — better
Requires iOS26.017.0 — better
Further details — not scored
Size27 MB26 MB
Age rating4+4+
DeveloperMefjuDev LLCAli Ahunbaev

In-app purchases

5 purchases

FastZen

Subscriptions4
  • Weekly3 Days trial$1.997 Days
  • Monthly$2.991 Month
  • 3 Months$7.993 Months
Show 1 more
  • Yearly$19.991 Year
One-time1
  • Lifetime$39.99
None

Marble

No in-app purchases

Questions

Is FastZen free?
FastZen is free to download, with in-app purchases available.
Is Marble free?
Marble is free to download, with no in-app purchases.
Which has better reviews, FastZen or Marble?
FastZen and Marble are both rated 5.0 out of 5 on the App Store, from 9 and 2 ratings respectively.
Do FastZen or Marble have ads?
Neither FastZen nor Marble shows ads.

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