AltLog: Altimeter & Elevation
Track ascent, floors & climbs
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A simple altitude logger that uses the iPhone's pressure sensor — no GPS. Tap Start before a climb. See ascent, descent, and stair-equivalents tallied live.
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 battery cost is negligible. The pressure sensor sips power compared to GPS, so a long city walk costs you a single-digit percentage of battery.
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 update every second.
3. Tap Stop when you're done. The session lands in History with an altitude profile.
4. Add the Today Ascent widget to your Home Screen for at-a-glance totals.
5. Glance at the wrist — the standalone Apple Watch app runs a session without your phone.
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.
• Live Activity card on the Lock Screen and Dynamic Island while a session runs.
• Apple Watch companion app for wrist-only sessions.
• Home Screen widget with today's metres and a 7-day sparkline.
PRIVATE BY DESIGN
No account. No cloud. No third-party SDKs. No analytics, advertising, or attribution. Pressure samples are processed on-device and discarded; only a downsampled session summary is stored in SwiftData. There is no network traffic. Deleting the app removes everything.
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Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Initial release.
The developer, Ilia Filiaev, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ilia Filiaev
- Size
- 1.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Ilia Filiaev