# Zef vs Kite Size Calculator

The clearest difference is in-app purchases: Kite Size Calculator at none against Zef's 3. Kite Size Calculator also leads on rating (5.0 vs 4.6) and iOS requirement (9.0 vs 15.0). Zef's advantage is update cadence (fortnightly vs every 2 months) and ratings volume (41 vs 2). On price and ads there is nothing between them.

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

Kite Size Calculator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Zef has 41 ratings behind it against 2, so its average is the more settled of the two.

Zef ships an update fortnightly, Kite Size Calculator every 2 months. The most recent releases landed on October 22, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Zef | Kite Size Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (41 ratings)](https://appshunter.io/ios/app/zef/id1447673572/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/kite-size-calculator/id1456801209/reviews)** |
| Number of ratings | **41** | 2 |
| Positive reviews | 90.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Freemium | **Free** |
| Size | 43 MB | 34 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | **iPhone, iPad, iPod, Mac, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Kieffer](https://appshunter.io/developer/1341935892) | [idyation GmbH](https://appshunter.io/developer/1421286534) |

## 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 |


### Kite Size Calculator

[App page](https://appshunter.io/ios/app/kite-size-calculator/id1456801209)

This app helps kite surfers decide which kite to use based on their weight and current wind speed. Users input their weight and wind conditions, then add their available kites to receive a recommendation.

**Highlights:** Kite size recommendation, Input user weight, Input wind speed, Add available kites, Wind speed indicator

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zef free?

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

### Is Kite Size Calculator free?

Kite Size Calculator is free to download, with no in-app purchases.

### Which has better reviews, Zef or Kite Size Calculator?

Kite Size Calculator is rated higher. Zef averages 4.6 out of 5 from 41 ratings, while Kite Size Calculator averages 5.0 from 2 ratings.

### Do Zef or Kite Size Calculator have ads?

Neither Zef nor Kite Size Calculator shows ads.

### Which is updated more often, Zef or Kite Size Calculator?

Zef ships an update fortnightly, and Kite Size Calculator every 2 months. Most recently, Zef was updated on October 22, 2026 and Kite Size Calculator on October 7, 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.*