# Rhythm vs 16

The clearest difference is in-app purchases: Rhythm at none against 16's 3. Rhythm also leads on ratings volume (458 vs 54) and review sentiment (89% vs 78%). 16's advantage is update cadence (every 9 days vs every 13 months) and iOS requirement (15.0 vs 17.6). On price, rating, ads and device support there is nothing between them.

Both are free to download. 16 sells 3 in-app purchases, starting at $1.99 per month. Rhythm asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Rhythm against 4.7 for 16. That said, the two scores are not equally well evidenced: Rhythm has 458 ratings behind it against 54, so its average is the more settled of the two. Written reviews are what separate them: 89% of Rhythm's written reviews are positive against 78% of 16's.

Rhythm ships an update every 13 months, 16 every 9 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Rhythm | 16 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (458 ratings)](https://appshunter.io/ios/app/rhythm-fasting-tracker/id1377199450/reviews) | **[4.7 (54 ratings)](https://appshunter.io/ios/app/168-intermittent-fasting/id6708227128/reviews)** |
| Number of ratings | **458** | 54 |
| Positive reviews | **88.6% of reviews** | 77.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 6 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Bijan Cronin](https://appshunter.io/developer/1377199449) | [Heze Refresh Network Technology Co., Ltd](https://appshunter.io/developer/1690178793) |

## What reviewers say

### Rhythm

[App page](https://appshunter.io/ios/app/rhythm-fasting-tracker/id1377199450)

This app simplifies intermittent fasting with a daily tracker. It supports various fasting schedules, from beginner-friendly to advanced, and helps users monitor their progress over time. Get notifications when your fast is complete.

**Highlights:** Daily fasting tracker, Flexible schedule support, Weekly progress tracking, Customizable fasting goals, One-click start, Progress monitoring, Completion notifications

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 💎 Simple and easy to use
- 🆓 Free app with no ads or subscriptions
- ⏱️ Straightforward fasting timer
- 📊 Tracks fasting progress
- 🔍 Allows editing of start/end times

**What reviewers complain about**

- ⏰ Can't track fasts longer than 24 hours
- 📅 Limited history view (only past week)
- 🔔 Lacks customizable notifications/reminders

**Reported bugs**

- Can't add past fasts
- Inconsistent weekly progress tracking

**Requested features**

- Ability to track longer fasts (e.g., 48-72 hours)
- Option to view fasting history beyond the past week
- Customizable notifications and reminders
- Integration with health/fitness tracking apps
- Weight tracking and progress visualization


### 16

[App page](https://appshunter.io/ios/app/168-intermittent-fasting/id6708227128)

This app helps users adopt intermittent fasting by tracking fasting periods, weight changes, and daily water intake. It integrates with Apple Health to import exercise data, providing insights into daily activity alongside dietary progress.

**Highlights:** Fasting tracking, Weight tracking, Water intake tracking, HealthKit integration, Fasting progress visualization

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $1.99 | per month |
| Pro (Yearly) | $8.99 | per year |
| Pro (Lifetime) | $17.99 | one-time |


## Frequently asked questions

### Is Rhythm free?

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

### Is 16 free?

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

### Which has better reviews, Rhythm or 16?

16 is rated higher. Rhythm averages 4.7 out of 5 from 458 ratings, while 16 averages 4.7 from 54 ratings.

### Do Rhythm or 16 have ads?

Neither Rhythm nor 16 shows ads.

### Which is updated more often, Rhythm or 16?

Rhythm ships an update every 13 months, and 16 every 9 days. Most recently, Rhythm was updated on October 23, 2026 and 16 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.*