# Intermittent Fasting vs Understanding Sleep

The clearest difference is in-app purchases: Understanding Sleep at none against Intermittent Fasting's 3. Understanding Sleep also leads on ads (none vs shown). Intermittent Fasting's advantage is update cadence (every 6 days vs fortnightly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Intermittent Fasting sells 3 in-app purchases, starting at $4.99 per month. Understanding Sleep asks for nothing beyond the download.

Intermittent Fasting ships an update every 6 days, Understanding Sleep fortnightly. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Intermittent Fasting | Understanding Sleep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/intermittent-fasting-orbit/id6756070517/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 35 MB | 92 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Sofiia Stashkiv](https://appshunter.io/developer/1858287768) | [Avicenna Research Inc.](https://appshunter.io/developer/1137173051) |

## What reviewers say

### Intermittent Fasting

[App page](https://appshunter.io/ios/app/intermittent-fasting-orbit/id6756070517)

This app provides a precise timer and tracker for intermittent fasting windows. It offers live stage insights, gentle reminders, and streak tracking to help users maintain consistency without calorie counting or food logging. Designed for clarity and ease of use, it supports various fasting schedules and works offline.

**Highlights:** Precise fasting timer, Live stage insights, Gentle reminders, Streak tracking, Works offline, Supports various fasting schedules

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Unlimited | $4.99 | per month |
| Yearly Unlimited | $29.99 | per year |
| Lifetime Unlimited | $59.99 | one-time |


### Understanding Sleep

[App page](https://appshunter.io/ios/app/understanding-sleep/id6763775915)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Intermittent Fasting free?

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

### Is Understanding Sleep free?

Understanding Sleep is free to download, with no in-app purchases.

### Do Intermittent Fasting or Understanding Sleep have ads?

Intermittent Fasting shows ads; Understanding Sleep does not.

### Which is updated more often, Intermittent Fasting or Understanding Sleep?

Intermittent Fasting ships an update every 6 days, and Understanding Sleep fortnightly. Most recently, Intermittent Fasting was updated on October 18, 2026 and Understanding Sleep on October 24, 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.*