# Zef vs Gustly

The clearest difference is in-app purchases: Gustly at none against Zef's 3. Zef's advantage is device support (5 vs 3). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Zef sells 3 in-app purchases, starting at $6.99 per month. Gustly asks for nothing beyond the download.

Zef ships an update fortnightly, Gustly every 9 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Zef | Gustly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (41 ratings)](https://appshunter.io/ios/app/zef/id1447673572/reviews)** | — |
| Number of ratings | **41** | — |
| Positive reviews | 90.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Freemium | — |
| Size | 43 MB | 73 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [David Kieffer](https://appshunter.io/developer/1341935892) | [Konstantinos Kefalas](https://appshunter.io/developer/737480101) |

## What reviewers say

### Zef

[App page](https://appshunter.io/ios/app/zef/id1447673572)

Track and organize your rides for various sports, including nautical activities. Features include race organization, jump height estimation, and social sharing of sessions and spots. Integrates with Health app for comprehensive data recording.

**Highlights:** Race organization and championship management, Jump height estimation using drone technology, Support for a wide range of sports, GPX file import from watches, Health app integration, Social feed for friends and spots, Live tracking and notifications

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium for one  month | $6.99 | per month |
| Summit for one year | $26.99 | per year |
| Premium for one year | $34.99 | per year |


### Gustly

[App page](https://appshunter.io/ios/app/gustly/id6762547171)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Zef free?

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

### Is Gustly free?

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

### Do Zef or Gustly have ads?

Neither Zef nor Gustly shows ads.

### Which is updated more often, Zef or Gustly?

Zef ships an update fortnightly, and Gustly every 9 days. Most recently, Zef was updated on November 2, 2026 and Gustly on October 31, 2026.

---

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