Altim-O-Tron
The offline altimeter HUD
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
An altimeter, compass, barograph, and climb recorder that needs zero data connection. Works on the summit, in the canyon, and everywhere in between.
ALTIM-O-TRON is a precision altimeter that works when nothing else does: no cell service, no Wi-Fi, no problem. It reads GPS satellites and your iPhone's barometer directly, fusing them into a smooth, accurate altitude readout wrapped in a glowing instrument panel.
KNOW YOUR ALTITUDE
• GPS + barometer fusion: absolute accuracy with instant response
• Vertical speed, pressure altitude, and precise coordinates
• Live elevation profile of your session
MEASURE IT YOUR WAY
Feet and meters, obviously. But also the international standards of fathoms, furlongs, smoots, and giraffes. Choose wisely.
ALTITUDE INTEL
A built-in database of 300+ things lets you see your altitude in real-world terms. A number is useful, but it's much more interesting to know that you're at the same height as the tip of the Eiffel Tower, Machu Picchu, a bar-headed goose crossing the Himalaya, or the world's highest ATM (fees apply) — and the intel updates as you climb.
TRUE COMPASS
Includes a proper compass rose with true north computed entirely on-device, plus course and ground speed. Yes, speed can be displayed in furlongs per fortnight. You're welcome.
RECORD YOUR CLIMBS
The session recorder captures your elevation profile with total ascent and descent — and keeps recording with your screen locked and the phone in your pocket. Export any session as a standard GPX track for your favorite mapping apps. Use it to geotag photos with the Geotag-O-Tron sister app!
READ THE SKY
The offline barograph logs sea-level-corrected pressure and reads the three-hour tendency. Track the weather like the sailors of old (they didn't have smartphones of course, so they had to use flip phones or Treos or something). Pressure falling fast? Maybe start heading down.
ABSOLUTELY NO NETWORK
Altim-O-Tron contains zero networking code. Nothing is collected, nothing is transmitted, nothing phones home. Your location never leaves your device. It works on a summit, in a slot canyon, in airplane mode, and at the bottom of Death Valley (there's altitude intel for that too).
No accounts. No ads. No tracking. No masters.
The developer, Benjamin Robert Long, 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
- Benjamin Robert Long
- Size
- 5.7 MB
- Category
- Navigation
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- Copyright © 2026 by Ben Long