Altimeter: Hike & Ascent Log

See your altitude the moment you open the app. Record every meter you climb. Works with no signal at all.

REAL-TIME ALTITUDE · A huge, sunlight-readable number · Good / Fair / Poor confidence badge — know how much to trust it · Honest precision: never shows decimals it can't back up · Relative oxygen availability estimate for high-altitude trips — not blood oxygen or medical data

ELEVATION GAIN, DONE RIGHT · One tap records ascent, descent, highest, lowest, and duration · Barometer + GPS fusion with automatic weather-drift correction · Smart noise filtering: standing still never adds fake ascent · Keeps recording with the screen locked; auto-recovers if interrupted

ALTITUDE CURVE · Live time–altitude chart while you climb · Scrub through past climbs point by point

ACHIEVEMENT CARDS · Turn a summit into a beautiful shareable card with your stats and curve

MOUNTAIN LEADERBOARDS · Every mountain gets its own board — fastest time wins · Strictly opt-in: don't post, and the app stays fully offline · No sign-up: app-scoped iCloud identity, pick a nickname · Remove your results anytime; touch and hold to report content

WHY ALTIMETER · Core features work fully offline — deep wilderness, airplane mode, doesn't matter · No ads, no accounts, no tracking: altitude, location, and hike records stay on your phone by default; leaderboard results and feedback are sent only when you choose · One small one-time purchase unlocks everything. No subscription.

Free: live altitude and full recording. Pro: unlimited history and card export.