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Journal

Notes from
the field.

Field reports, safety reviews and engineering deep dives from the people building Diorite, and the guides who keep us honest.

A lone climber on a snow-covered peak

Company2 min read

The door's open: Diorite is now for everyone

Seven months ago we handed Diorite to a small group of early-access climbers and asked them to break it. This week, we're taking the rope off the gate.

Elena Marsh

October 7, 2026

Mountaineers climbing a snowy slope on Mont Blanc

Field notes2 min read

Three forecasts, one saddle, and the night that started all of this

A storm on the Grand Teton that three forecasts couldn't agree on taught us that the most important thing a mountain partner can do is admit when it's unsure.

Elena Marsh

October 2, 2026

Distant alpinists climbing a snowy mountain slope

Safety2 min read

They said no twice, and we are grateful

Twelve guides, patrollers and rescuers reviewed the build we planned to open to everyone. They blocked it twice. Here is what they caught.

Jonas Feld

September 18, 2026

Hikers climbing a snowy ridge on a cloudy day

Engineering2 min read

Field Mode: a second opinion for when the bars disappear

The moment you most want a second opinion is usually the moment your phone says 'No Service.' Here's how we built for that.

Kai Nakamura

August 27, 2026

Climbers trekking on a frozen mountain slope

Safety2 min read

How to read an avalanche bulletin over your morning coffee

A friendly, five-minute walkthrough of the parts of a bulletin that matter most for your day, written with our avalanche instructors.

Elena Marsh

July 30, 2026

Hiker climbing a snowy ridge with rocky formations

Product2 min read

Designing for cold hands, bright snow and a racing heart

What we learned watching people use Diorite at minus 15, in full sun, tired and a little scared.

Aisha Rahman

July 9, 2026

Mountaineers climbing a rocky snowy range

Engineering2 min read

Listening to 1.2 million trip reports, kindly and skeptically

Trip reports are messy, wonderful and full of heart. Here's how we learn from them without trusting any single one too much.

Leo Brandt

June 12, 2026

A lone climber on a snow-covered peak

Company2 min read

Why we are building Diorite

Our founding note from 2023: a partner for the mountains that shows its thinking, earns its place in your pack, and respects the terrain.

John Kole

April 20, 2023

The Diorite dispatch

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