One Peak: Altimeter Barometer.

Take command of every ascent with One Peak — the ultimate barometric altimeter and real-time vertical speedometer built for hikers, trail runners, mountaineers, and stair fitness enthusiasts. Engineered specifically for iOS, One Peak combines your iPhone’s internal barometer sensor with high-precision GPS to deliver real-time elevation tracking, instant vertical speed readings, and smooth elevation profile graphs — 100% offline. KEY FEATURES & CAPABILITIES • REAL-TIME BAROMETRIC ALTITUDE Get hyper-accurate altitude readings using your device’s barometric pressure sensor. Advanced noise-filtering algorithms eliminate sensor spikes from wind or doors for a silky-smooth elevation profile. • LIVE VERTICAL SPEEDOMETER Monitor your ascent and descent rate in real time (m/min or ft/min). Instantly see if you are gaining speed or maintaining a steady climbing pace. • DYNAMIC ELEVATION PROFILE GRAPH Watch your climb unfold live on a responsive elevation graph featuring auto-scaling, minimum and maximum elevation markers, and a clean topographic gradient fill. • LIVE ACTIVITY & DYNAMIC ISLAND Keep track of your current altitude, total elevation gain, and vertical speed directly from your Lock Screen and Dynamic Island without unlocking your phone. • TOTAL ELEVATION GAIN TRACKING Accurately calculate your total positive vertical gain throughout your session. Never lose track of your cumulative climbing achievements. • TACTILE HAPTIC MILESTONES Feel every achievement. Receive subtle, satisfying haptic feedback at customizable elevation milestones (+50m / +100m or +150ft / +300ft). • SESSION HISTORY & CSV EXPORT Save every trek, hike, or stair session locally. Review detailed metrics (max/min altitude, average vertical speed, total duration) and export raw data to CSV via the iOS Share Sheet. • LOCK SCREEN & HOME SCREEN WIDGETS View your live elevation and pressure trend at a glance with sleek iOS widgets designed for quick outdoor reference. WHY OUTDOOR ENTHUSIASTS CHOOSE ONE PEAK • 100% OFFLINE & BATTERY-EFFICIENT Designed for deep wilderness and remote alpine trails. One Peak uses GPS only for initial baseline calibration, minimizing battery drain during long mountain treks. • ZERO ADS, ZERO TRACKING, 100% PRIVATE Your location and session logs remain strictly on your device. No user accounts, no cloud syncing, no third-party analytics, and zero advertising. • TOPOGRAPHIC INSTRUMENT UI Designed with a dark, high-contrast slate theme inspired by professional alpine instruments. High readability under bright sunlight or dark night trails. PERFECT FOR: - Hiking & Backpacking - Trail Running & Skyrunning - Mountaineering & Alpine Climbing - Stair Climbing & Vertical Fitness - Skiing, Snowboarding & Paragliding Download One Peak today and transform your iPhone into a professional-grade barometric altimeter!