# Marble vs FastFlow

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.

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.

## The numbers

| Metric | Marble | FastFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/marble-intermittent-fasting/id6477356664/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 280 MB | 35 MB |
| Requires iOS | 17.2 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Maksim Vakarchuk](https://appshunter.io/developer/1504357263) | [Uprise iX LLC](https://appshunter.io/developer/1809234369) |

## What reviewers say

### Marble

[App page](https://appshunter.io/ios/app/marble-intermittent-fasting/id6477356664)

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.

**Highlights:** Personalized fasting schedules, Next fast timer, Home screen widgets, iCloud data sync, No data collection, Ad-free experience

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |
| Annual Subscription | $14.99 | per year |
| Lifetime | $24.99 | one-time |


### FastFlow

[App page](https://appshunter.io/ios/app/fastflow-intermittent-fasting/id6758635076)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.99 | per month |
| Weekly Subscription | $8.99 | per 7 days |


## Frequently asked questions

### Is Marble free?

Marble is free to download, with in-app purchases available.

### Is FastFlow free?

FastFlow is free to download, with in-app purchases available.

### Do Marble or FastFlow have ads?

Neither Marble nor FastFlow shows ads.

### Which is updated more often, Marble or FastFlow?

Marble ships an update fortnightly, and FastFlow every 2 days. Most recently, Marble was updated on November 4, 2026 and FastFlow on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*