AltitudeAhead
AltitudeAhead
Plan your ascent. Respect the altitude.
Understand your sleeping-altitude profile, review your itinerary, and prepare for your next high-altitude adventure.
Coming soon to the App Store
An acclimatization planner for your iPhone
Enter where you'll sleep each night of your trek or expedition. AltitudeAhead draws your sleeping-altitude profile and compares the itinerary with established acclimatization recommendations from the CDC Yellow Book and the Wilderness Medical Society.
It highlights days where your sleeping altitude rises faster than general guidance above 3,000 m, and points out where an extra acclimatization day may fit — in under two minutes, offline, without an account.
Screenshots
Features
Stage planning
Sleeping altitude, optional daytime maximum, rest days and notes for every stage. Reorder, duplicate, meters or feet.
Altitude profile
A clear, interactive sleeping-altitude chart. Tap any day to see its gain from the night before.
Acclimatization guidance
General planning considerations for daily gain and acclimatization days, with references. Always free.
Learn
Altitude sickness, acclimatization, sleeping altitude and warning signs — available offline. Always free.
Pro: detailed analysis
Stage-by-stage figures, a what-if planner with suggested alternatives, tour comparison, PDF and image export. One-time purchase, no subscription.
Private by design
Your tours stay on your iPhone. No account, no ads. Optional anonymous statistics only with your consent.
Know before you go
If you have symptoms of altitude illness, don't go higher. Worsening symptoms, confusion, loss of coordination or breathlessness at rest require immediate descent and medical help.
Altitude illness can occur from about 2,500 m, and fitness doesn't protect you. Sleeping altitude and how quickly you gain it matter most.
Important
AltitudeAhead is a planning tool, not a medical device. It compares your itinerary with general recommendations and cannot tell you whether you are acclimatized or safe. Talk to a doctor before travelling to high altitude.
Altitude knowledge
Understanding altitude sickness
Acute mountain sickness, HACE and HAPE: what they are and why severe symptoms need urgent action.
Read article →How acclimatization works
How your body adapts to thinner air, how long it takes, and what helps.
Read article →Why sleeping altitude matters
Where you sleep matters more than the highest point of the day.
Read article →Planning acclimatization days
General ascent recommendations and why an extra day can make a difference.
Read article →Warning signs and when to descend
The rules that matter most at altitude. Read this before every trip.
Read article →Check your itinerary with AltitudeAhead
Enter where you'll sleep each night. AltitudeAhead draws your sleeping-altitude profile, highlights days with large gains above 3,000 m and shows where an acclimatization day may fit.
Coming soon to the App Store