For a long time the phone was the backup and the vario was the instrument. For a lot of pilots that has flipped: the iPhone in the harness is the primary vario and the dedicated device stays in a drawer. Whether that works for you depends almost entirely on the app.
How a phone vario works
Every iPhone since the iPhone 6 has a barometric pressure sensor. Air pressure drops as you climb, so sampling the barometer several times a second gives altitude, and the rate of change gives your climb or sink. That is the same principle a dedicated vario uses.
The catch is lag. Pressure readings are noisy, and smoothing the noise away adds delay. A vario that only reads the barometer tells you about lift a second or two after you flew into it, which is too late to centre a weak thermal. The better apps fix this by combining the barometer with the accelerometer: the accelerometer feels the vertical acceleration immediately, the barometer confirms it a moment later, and the fusion of the two gives a reading that is both fast and stable. This is how Wingman's reactive variometer works.
What to look for in a vario app
- Response time. Lift the phone quickly and listen. If the beep starts before your arm stops moving, the app is fusing sensors. If it starts after, it is barometer-only.
- Audio you can tune. Separate thresholds for climb and sink, and tones you can tell apart from wind noise.
- A screen you can read in one glance, in direct sun, with gloves on.
- Recording that never needs you. Automatic take-off and landing detection, and IGC export for XContest or your club.
- Battery. GPS and a bright screen are the two big consumers. A good app keeps recording with the screen off and wakes with a tap.
Phone vs dedicated vario in 2026
A dedicated vario still wins on two things: a sunlight-readable e-paper screen and battery life measured in days. If you fly ten-hour vol-biv routes, that matters. For everyone else the gap has closed. A phone app is updated several times a year, has a far better map, and you carry the phone anyway.
There is also a middle path. Many pilots keep a small Bluetooth vario as the sensor and let the phone do the display and recording. Wingman connects to external Bluetooth varios from Stodeus, Syride and XCTracer, so you can use the dedicated sensor when you want it and the phone's own sensors when you do not.
Using your iPhone as a vario with Wingman
- Reactive vario from barometer and accelerometer fusion, with adjustable climb and sink thresholds.
- Distinct beeps for weak and strong lift, so you hear the difference between a bubble and a core.
- Automatic flight logging with IGC export.
- The same vario on the Apple Watch, running on its own if the phone stays at home.
The whole setup is the phone on a leg or cockpit mount, or the Watch on your wrist. No cables, and no second device to charge the night before. The same setup works on a paramotor, where engine vibration doesn't disturb the vario: see Wingman for paramotor pilots.
Frequently asked questions
Does the phone need to be out of my pocket?
No. The barometer and accelerometer work in a pocket or a harness compartment; only the map needs the screen. Wingman detects take-off and landing on its own, so you can leave the phone put away for the whole flight.
Is the iPhone barometer accurate enough?
For climb rate, yes: what matters is the change in pressure, which the sensor measures finely. Absolute altitude drifts with the weather, as it does on any barometric instrument, and GPS altitude is used alongside it.
Which iPhones and Watches work?
Any iPhone that runs iOS 15.4 or later, which means the iPhone 6s or newer, and all of them have a barometer. On the Apple Watch you need watchOS 10 or later: Series 4 or newer, SE or Ultra. The App Store listing always shows the current minimum versions.
Which vario app is best?
We compare Wingman, FlySkyHy and Gaggle on vario response, airspace and Watch support in the best paragliding apps in 2026.
