# Zopper Engage vs FastSloth

The clearest difference is in-app purchases: Zopper Engage at none against FastSloth's 1. Zopper Engage also leads on iOS requirement (17.6 vs 26.0). FastSloth's advantage is update cadence (weekly vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. FastSloth sells 1 one-off in-app purchase. Zopper Engage asks for nothing beyond the download.

Zopper Engage ships an update every 5 weeks, FastSloth weekly. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Zopper Engage | FastSloth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/fastsloth-fasting-tracker/id6759827972/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 154 MB | 10 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 12+ |
| Developer | [Ocktolife](https://appshunter.io/developer/1531129749) | [Darren Paul](https://appshunter.io/developer/1874841503) |

## What reviewers say

### Zopper Engage

[App page](https://appshunter.io/ios/app/zopper-engage/id6738331220)

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

**In-app purchases:** none


### FastSloth

[App page](https://appshunter.io/ios/app/fastsloth-fasting-tracker/id6759827972)

This app helps you track intermittent fasting with customizable schedules and real-time indicators of your body's stages. It also includes hydration logging, weight tracking with visual progress charts, and smart notifications to keep you on track. All your data stays private on your device.

**Highlights:** Customizable fasting schedules, Real-time ketosis and autophagy indicators, Hydration logging and reminders, Weight tracking with progress charts, Streak tracking and milestone badges, Home screen widgets, Private, no account required

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is Zopper Engage free?

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

### Is FastSloth free?

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

### Do Zopper Engage or FastSloth have ads?

Neither Zopper Engage nor FastSloth shows ads.

### Which is updated more often, Zopper Engage or FastSloth?

Zopper Engage ships an update every 5 weeks, and FastSloth weekly. Most recently, Zopper Engage was updated on November 8, 2026 and FastSloth on November 5, 2026.

---

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