Zef
Riding sports social tracking
Free · In‑App Purchases
The swiss knife of your water & wind sports !
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
- fix pump detection
- improve jump algo
– fix session state calculation
The developer, David Kieffer, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Location
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- David Kieffer
- Size
- 44.5 MB
- Category
- Sports
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 9.6 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Messaging and Chat
User-Generated Content
- In-App Purchases
Yes
- Premium for one month $6.99
- Premium for one year $34.99
- Summit for one year $26.99
- Copyright
- © 2026 Zef Inc.