VARIO One – Your smart variometer for iPhone and Apple Watch. Precise as a professional vario. Simply as an app. No additional devices needed. VARIO One combines barometric pressure sensor, accelerometer and GPS into a full-featured variometer -- right on your iPhone and Apple Watch. Both apps work independently and signal lift through acoustic beep tones. Test all features free for 14 days. REAL-TIME AIR TRAFFIC WITH SAFESKY See paragliders, hang gliders, sailplanes, helicopters and other air traffic in real time on your map. Your position is shared so others can see you too. You are instantly alerted by sound and vibration when traffic approaches -- graded by distance and closing speed. Free registration right in the app. THERMAL ASSISTANT Your flight track is color-coded live by climb and sink rates -- so you can instantly see where the best lift is in your circle. The app automatically detects circling and switches to the thermal view. Includes wind direction and speed. IMPORT FLIGHTS Import your previously flown flights as GPX or IGC files directly into the flight book -- using the +button or "Open with" from the Files app. VARIOMETER - Immediately audible lift through a combination of barometric pressure and accelerometer sensors. - Display of altitude, ground speed and glide ratio. - Rotating wind direction indicator with counter showing the last calculation. FLIGHT RECORDING - Automatic recording as GPS and IGC tracks. - Digital flight book with map view and statistics. - Automatic upload to DHV-XC and XContest - Automatic takeoff and landing detection. MAP - Airspaces and current wind from thousands of weather stations. - Takeoff and landing sites -- permanently visible for free. APPLE WATCH - Standalone vario with precise pressure sensors. - Ideal for Hike & Fly, as a backup or when there is no space in the cockpit. - Flight recording in GPX and IGC format. - Rotating wind direction indicator. New features are added regularly. You can test all features free for 14 days. Takeoff and landing sites remain free after the trial. The subscription renews automatically and can be cancelled at any time.