AltLog: Altimeter & Elevation

AltLog is a one-tap elevation logger. It reads the barometric pressure sensor built into your iPhone — the same chip that powers Apple's Floors Climbed metric — and turns it into a live tally of metres climbed, metres descended, and stair-equivalents. There is no GPS. None. AltLog never asks for your location, and the pressure sensor uses far less power than GPS. WHEN IT WORKS • Inside parking garages, multi-story buildings, and stairwells where GPS is useless. • On hiking trails when you want a low-power supplement to your map app. • In elevators — yes, you can verify the "23rd floor" sign matches what the sensor saw. • Anywhere there is air. (Sealed pressurised vehicles excepted — physics, not us.) HOW TO USE 1. Tap Start before a walk, hike, or staircase climb. 2. Watch the ascent and descent tally grow as you climb. 3. Tap Stop when you're done. The session lands in History with an altitude profile. WHAT YOU GET • Live cumulative ascent in metres and stair-equivalents (1 stair = 0.20 m). • Cumulative descent — useful for trail running and post-climb verification. • An altitude profile chart per session you can scroll through later. FREE AND PRO Recording sessions is free, and your three most recent sessions are always there. AltLog Pro, a one-time in-app purchase, unlocks your full session history. PRIVATE BY DESIGN No account. No cloud. No ads, no tracking. Pressure samples are processed on-device and discarded; only a downsampled session summary is stored on your iPhone. Deleting the app removes everything.