Company
We build the partner
we wished we had.
Diorite is a small team of guides, engineers, forecasters and designers in Boulder and Chamonix. We spend our weekends in the mountains and our weeks making them a little more knowable.
Team trip, Pyrenees, 2025
Why "Diorite"
A hard, speckled igneous rock: black and white, never one or the other. Like good mountain judgment.
Three forecasts.
One storm.
In August 2022, Elena and John were on the Lower Saddle of the Grand Teton when a storm arrived four hours before any forecast said it would. They had checked three. Each was right about something. None of them told the whole story. On the hike out they sketched the tool they wished they had carried: one that read everything, reconciled it honestly, and stayed useful without a signal.
A storm on the Grand
Our founders get pinned on the Lower Saddle by a storm three forecasts disagreed about. The idea starts in a tent.
AI Outdoors LLC is formed
Registered in Delaware on April 13. First prototype reads avalanche bulletins and trip reports for 40 Front Range routes.
Safety council formed
Twelve guides, patrollers and SAR leads begin reviewing every model release before it ships.
Diorite early access
Our first AI product reaches a small group of early-access climbers, skiers and guides, who stress-test it all season.
Field Mode prototype
Offline reasoning runs on a phone for the first time, tested by early-access guides on summer objectives.
Open to everyone
This week Diorite opens to anyone. No waitlist, no invite. Create an account and plan your next objective today.
Four rules we climb by.
Respect the mountain
Every feature is built with care for the places we love and the people who explore them.
Show our reasoning
The best partners explain their thinking. Every answer shows the sources and logic behind it.
Earn the weight
Like anything in a pack, every feature must justify itself. If it does not help you decide, it goes.
Go outside
Every Diorite employee gets 20 field days a year, paid. Our best ideas come from the trailhead.
The people on the other
end of the rope.
Backed by Alpine Ventures, Summit Partners Fund and a group of guides who invested their own money.
Elena Marsh
Co-founder & CEO
Former ski patroller, AIARE instructor.
John Kole
Co-founder & CTO
Built forecasting systems for a national weather service.
Aisha Rahman
Head of Design
Photographer and long-distance trekker.
Jonas Feld
Head of Safety
IFMGA guide, 14 seasons in the Alps and Himalaya.
Kai Nakamura
Lead, Field Mode
On-device ML. Climbs 5.12 badly, slowly.
Leo Brandt
Head of Data
Maintains our 1.2M trip-report pipeline. Bikepacker.
Do your best work,
then go outside.
Competitive salary, real equity, 20 paid field days, a gear stipend of $2,000 a year and an office dog named Couloir.
Now open to everyone · Season 2026
Your next summit
starts here.
Seven months of early access, tested by climbers and guides all season. No waitlist anymore. Create a free account and get your first brief in minutes.