# 16 vs Mantis

The clearest difference is in-app purchases: Mantis at none against 16's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 16 sells 3 in-app purchases, starting at $6.99 per 7 days. Mantis asks for nothing beyond the download.

16 ships an update every 5 days, Mantis every 3 days. The most recent releases landed on October 23, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 16 | Mantis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (64 ratings)](https://appshunter.io/ios/app/168intermittent-fasting-app/id6478310864/reviews)** | — |
| Number of ratings | **64** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 71 MB | 36 MB |
| Requires iOS | **16.2** | 17.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [AV PRO GROUP LTD](https://appshunter.io/developer/1699441355) | [Mikhail Kurbatov](https://appshunter.io/developer/6812049805) |

## What reviewers say

### 16

[App page](https://appshunter.io/ios/app/168intermittent-fasting-app/id6478310864)

This app guides users through intermittent fasting with personalized plans and convenient tracking tools. It helps manage weight, boost energy, and improve overall health with customizable reminders.

**Highlights:** Personalized intermittent fasting plans, Fasting and eating window tracking, Customizable start/end reminders, AI Calorie Tracker, Weight loss support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $6.99 | per 7 days |
| Premium Yearly Plan | $39.99 | per year |
| Premium Yearly Plan | $49.99 | per year |


### Mantis

[App page](https://appshunter.io/ios/app/mantis-smart-workouts/id6812049803)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is 16 free?

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

### Is Mantis free?

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

### Do 16 or Mantis have ads?

Neither 16 nor Mantis shows ads.

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

16 ships an update every 5 days, and Mantis every 3 days. Most recently, 16 was updated on October 23, 2026 and Mantis on October 29, 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.*