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!