Marble vs FastFlow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Marble
This app helps you track intermittent fasting with personalized schedules and timers. It offers home screen widgets for easy monitoring and prioritizes user privacy by syncing data via iCloud without collection.
- Personalized fasting schedules
- Next fast timer
- Home screen widgets
- iCloud data sync
- No data collection
- Ad-free experience
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Marble is a straightforward intermittent fasting tracker. It lacks promotions or unnecessary content. All data syncs through your personal iCloud account without any data collection. Personalized Fasting Schedules Marble is adaptable to any fasting schedule. Select a fasting and rest interval that fits your routine and goals. Next Fast Timer Building a habit is important. Marble will show a timer until the next fast to ensure a habit can get built. Widgets Keep up with your fast from your Home Screen by adding one of our widgets. It will show both fasting time and rest timers. Your Data We prioritize privacy. We don't collect any data for you to use our app; simply download and enjoy. Your fasts will be synced via your iCloud. Terms of Service: https://www.solidfoundation.app/tou/marble EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.solidfoundation.app/privacy-policy/marble
FastFlow
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FastFlow helps you build a consistent intermittent fasting routine with a clean timer, simple plans, and quick daily check-ins. Whether you’re doing 16:8, 14:10, 18:6, 20:4, or a custom schedule, FastFlow keeps your day clear: start a fast in one tap, see exactly when your eating window begins, and track how you feel so you can learn what works. What you can do with FastFlow - Fasting timer (one tap) - Start, end, or break a fast anytime - Countdown + progress at a glance -Clear labels for fasting vs eating time Plans & schedule - Choose a plan: 14:10, 16:8, 18:6, 20:4, or Custom - Set your eating start time and we calculate the rest - Adjust anytime—your routine should fit your life Gentle reminders - Notifications for Start fast, End fast, and Hydration - Reminders are optional and can be changed anytime in Settings Daily logs (fast check-in) - Track mood, energy, hunger - Optional weight and notes Insights & trends - Weekly/monthly performance and completion - Wellbeing averages from your logged days Subscription Details: If you choose to purchase FastFlow Premium, payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions auto-renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. Privacy Policy: https://sites.google.com/view/fastflow-app/privacy Terms of Service: https://sites.google.com/view/fastflow-app/terms-of-use
Screenshots
Verdict
The clearest difference is update cadence: FastFlow at every 2 days against Marble's fortnightly. FastFlow also leads on iOS requirement (15.1 vs 17.2). On price, ads, in-app purchases 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
Both are free to download. Marble sells 3 in-app purchases, starting at $1.99 per month and FastFlow sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Marble ships an update fortnightly, FastFlow every 2 days. The most recent releases landed on November 4, 2026 and October 25, 2026 respectively.
| Parameter | Marble | FastFlow |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Fortnightly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.2 | 15.1 — better |
| Further details — not scored | ||
| Size | 280 MB | 35 MB |
| Age rating | 17+ | 4+ |
| Developer | Maksim Vakarchuk | Uprise iX LLC |
In-app purchases
Marble
- Monthly Subscription$1.991 Month
- Annual Subscription$14.991 Year
- Lifetime$24.99
FastFlow
- Monthly Subscription$2.991 Month
- Weekly Subscription$8.997 Days









