# Empty vs Fast 16

The clearest difference is review sentiment: Empty at 70% against Fast 16's 0%. Empty also leads on rating (4.5 vs 2.5) and ratings volume (95 vs 2). Fast 16's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 6 months). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Empty sells 1 one-off in-app purchase and Fast 16 sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Empty holds the better App Store score, 4.5 against 2.5. That said, the two scores are not equally well evidenced: Empty has 95 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 70% of Empty's written reviews are positive against 0% of Fast 16's.

Empty ships an update every 6 months, Fast 16 every 3 weeks. The most recent releases landed on September 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Empty | Fast 16 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (95 ratings)](https://appshunter.io/ios/app/empty-fasting-tracker/id1349345869/reviews)** | [2.5 (2 ratings)](https://appshunter.io/ios/app/fast-16-intermittent-fasting/id1478273958/reviews) |
| Number of ratings | **95** | 2 |
| Positive reviews | **70.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 14 MB | 21 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thang Nguyen](https://appshunter.io/developer/921360262) | [Atthaporn Chanprakon](https://appshunter.io/developer/903328298) |

## What reviewers say

### Empty

[App page](https://appshunter.io/ios/app/empty-fasting-tracker/id1349345869)

This app helps you track various fasting methods, including intermittent, circadian rhythm, and custom plans. It provides smart reminders and detailed progress views to support your health goals.

**Highlights:** Intermittent Fasting Tracking, Circadian Rhythm Fasting, Custom Fasting Plans, Smart Reminders, Progress Visualization, Fasting History

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $4.99 | one-time |


### Fast 16

[App page](https://appshunter.io/ios/app/fast-16-intermittent-fasting/id1478273958)

This app helps you track your fasting periods with a built-in timer and helpful reminders. It provides detailed statistics on your fasting habits and offers resources to learn about healthy fasting practices.

**Highlights:** Fasting timer, Fasting reminders, Detailed fasting statistics, Healthy fasting resources, Weight tracking

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $2.99 | one-time |
| Fasting Pro Version | $5.99 | one-time |


## Frequently asked questions

### Is Empty free?

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

### Is Fast 16 free?

Fast 16 is free to download, with in-app purchases available.

### Which has better reviews, Empty or Fast 16?

Empty is rated higher. Empty averages 4.5 out of 5 from 95 ratings, while Fast 16 averages 2.5 from 2 ratings.

### Do Empty or Fast 16 have ads?

Empty shows ads; Fast 16 does not.

### Which is updated more often, Empty or Fast 16?

Empty ships an update every 6 months, and Fast 16 every 3 weeks. Most recently, Empty was updated on September 26, 2026 and Fast 16 on September 18, 2026.

---

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