Every mountain pass, read like a pilot.

Low Pass turns your iPhone into a barometer-first altimeter for mountain roads. Altitude, climb rate, and grade on a Boeing-style instrument panel, on your phone, your CarPlay Dashboard, and your wrist.

Altitude readout showing 12,095 feet at Independence Pass, Colorado.

• Barometer first. The pressure sensor in your iPhone reads altitude faster and steadier than GPS alone. GPS anchors it and takes over when it has to, and the panel always shows how much to trust the number.
• Free on the CarPlay Dashboard. Altitude and trend live as a tile on your car's screen. No subscription, no ads, no paywall while you drive.
• Your trips stay yours. Trips are recorded on your phone and sync through your own iCloud. There is no account and no Low Pass server. Export a GPX file any time.

Coming to the App Store in January 2027.Requires iPhone 12 or later for barometric altitude. CarPlay is a trademark of Apple Inc.