Altimeter: GPS & Barometer

ALTIMETER & BAROMETER

Buy once. Own forever. The most complete offline altitude and barometric pressure tool for outdoor enthusiasts — no subscription, no ads, no account required.

WHY THIS APP

ONE-TIME PURCHASE — Pay once, use forever. No monthly fees, ever.
OFFLINE CORE READINGS — Sensors, charts, trips, and saved places work without an account. No data collection.
TRIPLE-SOURCE ALTITUDE — Combines GPS, barometric sensor, and manual calibration; calibrated barometric readings provide strong relative precision.
PRECISION BAROMETER — Real-time pressure in 6 units (hPa, inHg, mmHg, psi, atm, mbar) with local pressure history charts.
TRUE iPAD SUPPORT — Real split-view layout, not a stretched iPhone interface.

CORE FEATURES

REAL-TIME SENSORS
• Altitude: GPS altitude, barometric altitude, or smart hybrid mode
• Barometric pressure with trend arrows and rate of change
• Compass: Magnetic/True North, declination, slope measurement
• Speed: current, average, max, and vertical rate
• Coordinates: Decimal, DMS, UTM, and MGRS formats
• Sunrise/sunset, golden hour, and blue hour times

TRIP RECORDING
• Background GPS tracking with automatic stationary detection
• Real-time map overlay with live elevation profile
• Full statistics: distance, ascent, descent, max/min altitude, average speed
• Export to GPX (compatible with Strava, Garmin) and image sharing
• Import GPX tracks from other apps
• Share a trip summary as an image

DATA CHARTS
• Live altitude and pressure history (1h / 6h / 24h / 7 days)
• Pinch to zoom, drag to pan, long-press for exact values
• Background sampling keeps recording even when the app is closed
• Configurable data retention from 7 days to forever

SAVED LOCATIONS
• Bookmark any position with its altitude and pressure
• Organize with custom icons and color labels
• See distance and bearing from your current position
• One-tap navigation via Apple Maps

LANGUAGE & DEVICE SUPPORT
• Fully bilingual: English and Simplified Chinese
• Theme options: follow system, light, or dark
• Siri Shortcuts open the altitude dashboard and trip recording screen
• Native iPhone and iPad layout support
• Apple Watch app for live watch-side altitude, pressure, coordinates, and speed
• Home Screen and Lock Screen widgets for recent altitude, pressure, and recording status

MORE TOOLS
• Manual calibration using a known altitude or QNH pressure value
• Local pressure and altitude history charts
• Clean dashboard with quick access to charts, trips, saved places, and settings

BUILT FOR

Hikers and mountaineers tracking ascent and monitoring conditions. Cyclists and trail runners analyzing elevation gain. Paragliding and aviation enthusiasts watching pressure changes. Photographers timing golden hour precisely. Anyone who wants a reliable, professional-grade altitude tool that works anywhere, with or without a signal.

LANGUAGE, THEME & PRIVACY

• Fully bilingual: English and Simplified Chinese, switch instantly in Settings — no restart neede