Zef vs Kite Size Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zef
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.
- 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
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Zef — Ride. Track. Connect. Zef is a multi-sport tracking app built for riders, with a strong focus on nautical sports. Track your sessions, analyze your performance, discover spots, and see your friends live — all in one app. Key Features Track your rides Record your sessions with your iPhone or Apple Watch. Zef integrates with the Health app and supports GPX imports from most watches. Advanced performance analytics Get detailed session stats including speed, distance, duration, speed polar, and health data. Sessions can be replayed to analyze each maneuver. Jump analysis Measure jump height using only your iPhone or Apple Watch. Powered by algorithms inspired by drone technology. Races & challenges Create private or public races for training or competition. Visual guidance and wind angles are displayed directly on your iPhone or Apple Watch. Spots & live activity Discover spots around you and see when riders are active. Follow spots and get notified when sessions start. Friends & live tracking Follow riders by username and get notified when friends go live. Watch their sessions live on the map and stay connected. Supported Sports Sailing, Windsurfing, Kitesurfing, Wingfoil, Kitefoil, Windfoil, SUP Foil, Surfing, Wakeboard, Kayaking, Paddling, Snowkiting, Landkiting, Cross-country skiing, Skating, Bike, Electric Bike, Parawingfoil, and more with custom tags. Apple Ecosystem • iPhone & Apple Watch support • Health app integration • Optimized for the Apple ecosystem Important Sessions must be recorded from the ground to be validated. Legal Terms of Service https://zef.watch/terms-and-conditions.html Privacy Policy https://zef.watch/privacy-and-security-policy.html
Kite Size Calculator
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.
- Kite size recommendation
- Input user weight
- Input wind speed
- Add available kites
- Wind speed indicator
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"Which kite should I take?" Possibly one of the most common questions I hear on the kite surf beach. This app is here to provide you with just another opinion to heat up the discussion ;-) Just fill in your weight and windspeed, add the kites you have and you will get an indication which one to pump. Enjoy your ride!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Zef | Kite Size Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (41 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 90.7% of reviews | — |
| Number of ratings | 41 — better | 2 |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | Free — better |
| Devices | iPhone, iPad, iPod, Mac, Apple Watch — better | iPhone, iPod |
| Requires iOS | 15.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | David Kieffer | idyation GmbH |
Customer experience
Zef
Kite Size Calculator
In-app purchases
Zef
- Premium for one month7 Days trial$6.991 Month
- Summit for one year$26.991 Year
- Premium for one year$34.991 Year
Kite Size Calculator
No in-app purchases
Questions
Is Zef free?
Is Kite Size Calculator free?
Which has better reviews, Zef or Kite Size Calculator?
Do Zef or Kite Size Calculator have ads?
Which is updated more often, Zef or Kite Size Calculator?
Other comparisons
