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Onebrief (YC S21) — Onebrief makes military headquarters run seamlessly

Virtually everything in the military requires a plan—from everyday operations to war-time missions. With a rigorous process, many stakeholders, and rudimentary software (PowerPoint!!), planning is very slow.

Onebrief is a Y Combinator company in the Summer 2021 batch. Its directory entry describes it as: Onebrief makes military headquarters run seamlessly. The founder listed is Grant Demaree (Founder) (Y Combinator directory entry, July 8, 2021).

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Onebrief

New accelerator entry · 2021-07-08 · the record

Summer 2021
batch
200
people
Growth
stage
United States of America
region
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What the record says

BatchSummer 2021
Announced2021-07-08
StageGrowth
StatusActive
Team size200
IndustryB2B
Sub-industryB2B
SectorsSaaS, GovTech, Defense
RegionsUnited States of America, America / Canada, Remote, Fully Remote
BasedHonolulu, HI, USA; Remote
HiringNo
Sitehttps://onebrief.com
Founded2019
YC group partnerBrad Flora

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Also in YC Summer 2021

Same batch, B2B first.

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In their words

Virtually everything in the military requires a plan—from everyday operations to war-time missions. With a rigorous process, many stakeholders, and rudimentary software (PowerPoint!!), planning is very slow. Onebrief is a collaborative software designed to make military planning fast. It turns every input into reusable building blocks and automatically keeps all planning artifacts in sync.

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Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)

A Full Report on Onebrief: verified, sourced, every claim cited, ready in a few minutes. See pricing.

What the Full Report on Onebrief covers

  1. The Short Answer

  2. Which Company This Is

  3. What They Do, And How The Money Works

  4. Who Runs It, And How To Reach Them

  5. The Money: Funding, Valuation, Runway

  6. Who Pays Them, And Who They Are Up Against

  7. Warning Bells

  8. Sources

    1 cited source found

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Sourced from the company's Y Combinator directory entry.

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Onebrief: Accepted into Y Combinator Summer 2021
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Permanent URL: https://mentionfox.com/funding/yc-onebrief
Last updated 2026-10-29
Primary record: Y Combinator directory entry
Onebrief (YC S21) — Onebrief makes military headquarters run seamlessly. MentionFox, 2026-10-29. https://mentionfox.com/funding/yc-onebrief