# Empty Fasting vs SadBox

The clearest difference is in-app purchases: Empty Fasting at none against SadBox's 4. Empty Fasting also leads on update cadence (every 3 days vs every 4 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SadBox sells 4 in-app purchases, starting at $1.99 per month. Empty Fasting asks for nothing beyond the download.

Empty Fasting ships an update every 3 days, SadBox every 4 weeks. The most recent releases landed on August 15, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Empty Fasting | SadBox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (68 ratings)](https://appshunter.io/ios/app/empty-fasting/id6475213946/reviews)** | — |
| Number of ratings | **68** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 weeks |
| Monetization | Free | — |
| Size | 169 MB | 14 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 4+ |
| Developer | [Light Nudge](https://appshunter.io/developer/1731016560) | [俊辰 黎](https://appshunter.io/developer/1813083979) |

## What reviewers say

### Empty Fasting

[App page](https://appshunter.io/ios/app/empty-fasting/id6475213946)

This app helps users focus on a single fasting period at a time, offering both overnight and daytime schedules. It provides customizable themes and icons, home screen widgets, and tracks fasting streaks and trends with encouraging messages.

**Highlights:** Single fast focus, Home screen widgets, Overnight and daytime schedules, Customizable themes and icons, Streak and trend statistics, Encouragement during fasts

**In-app purchases:** none


### SadBox

[App page](https://appshunter.io/ios/app/sadbox/id6749219213)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $1.99 | per month |
| Quarterly Membership | $4.99 | per 3 months |
| Annual Membership | $8.99 | per year |
| Lifetime Membership | $12.99 | one-time |


## Frequently asked questions

### Is Empty Fasting free?

Empty Fasting is free to download, with no in-app purchases.

### Is SadBox free?

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

### Do Empty Fasting or SadBox have ads?

Neither Empty Fasting nor SadBox shows ads.

### Which is updated more often, Empty Fasting or SadBox?

Empty Fasting ships an update every 3 days, and SadBox every 4 weeks. Most recently, Empty Fasting was updated on August 15, 2026 and SadBox on September 7, 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.*