Onebrief

Onebrief

Defense planning software with reusable cards

Overview

Onebrief provides a cloud-based planning tool tailored for defense organizations. It converts complex operational plans into reusable, real-time cards that organize information into a collaborative, update-friendly workspace. The product helps commanders, staff officers, NCOs, and defense partners react quickly to changes, speeding up decision cycles and reducing time spent on preparing slides and planning documents. Unlike traditional planning tools, Onebrief emphasizes a card-based, real-time, multi-user workflow designed for fast, synchronized planning across teams. The company operates on a software-as-a-service model with subscription revenue and is backed by Y Combinator, which signals support from a well-known startup ecosystem. Onebrief’s goal is to streamline military planning processes, improve collaboration, and deliver faster, more coordinated decisions for defense missions.

YC Company

About Onebrief

Simplify's Rating
Why Onebrief is rated
B
Rated A on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

Data & Analytics

Government & Public Sector

Enterprise Software

Defense

Company Size

201-500

Company Stage

Series D

Total Funding

$362.2M

Headquarters

Honolulu, Hawaii

Founded

2019

People at Onebrief

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Simplify's Take

What believers are saying

  • $200M Series D at $2.15B valuation funds AI Assist expansion and successful integration of Battle Road Digital's wargaming tech.
  • Top Secret authorization for AtomEngine unlocks full joint force access across SIPR, NIPR, and JWICS networks.
  • Cory Ondrejka's leadership as CTO drives seamless fusion of agentic AI, simulation, and operational planning into one platform.

What critics are saying

  • Single-vendor lock-in with DAF CLOUDworks and Second Front blocks deployment to DoD components outside Air Force within 12–18 months.
  • Technical integration failure between planning and wargaming modules from Battle Road acquisition could delay commander operations in 6–12 months.
  • Compliance burden from IL5/IL6/Top Secret authorization forces costly security upgrades and slows deployment across combatant commands in 9–15 months.

What makes Onebrief unique

  • Onebrief unifies planning, wargaming, and AI into one command operating system for military staffs.
  • Its AtomEngine enables planet-scale, five-domain wargaming across all DoD classified networks without deployment limits.
  • The platform replaces fragmented legacy tools with real-time collaborative workflows that reduce staff production time by 2x.

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Funding

Total Funding

$362.2M

Above

Industry Average

Funded Over

8 Rounds

Series D funding is typically for companies that are already well-established but need more funding to continue their growth. This round is often used to stabilize the company or prepare for an IPO.
Series D Funding Comparison
Above Average

Industry standards

$77M
$70M
Twilio
$80M
Handshake
$100M
Affirm
$200M
Onebrief

Growth & Insights and Company News

Headcount

6 month growth

7%

1 year growth

0%

2 year growth

6%
Onebrief
Feb 6th, 2026
Onebrief Expands Leadership Team with TechVeteran Cory Ondrejka

Onebrief expands leadership team with techveteran Cory Ondrejka. February 6, 2026 HONOLULU (Feb. 3) - Onebrief, the operating system for modern command, today announced that it has hired Cory Ondrejka as Chief Technology Officer (CTO). Ondrejka brings to Onebrief more than 30 years of experience inventing and delivering new technologies while leading large engineering teams, including at Google and Meta. As CTO, Ondrejka will lead Onebrief's engineering organization. He will lead the expansion of Onebrief's artificial intelligence-driven support capabilities and integrate advanced wargaming, modeling, and simulation tools through Onebrief's acquisition of Battle Road Digital. This will bring together operational planning, wargaming, and simulation within the Onebrief platform, creating a single, unified environment for military command. He will focus on making these tools intuitive and seamless, enabling teams to plan, test, and adapt at superhuman speeds. "Over the last three decades, Cory has been involved in some of the most important shifts in modern technology," said Onebrief CEO Grant Demaree. "He understands how to turn new ideas into trusted systems. Cory has already been deeply involved in its work strengthening Onebrief's AI Assist capabilities and integrating Battle Road Digital's best-in-class simulation technologies into its platform. His leadership is critical to its efforts to strengthen and scale this platform. He is the right person to lead its technology. "Joining Onebrief feels like a homecoming," said Ondrejka, a graduate of the United States Naval Academy. "The team is solving real problems for military planners, by incorporating AI into a platform that unites planning and wargaming in one unified system. As we integrate Battle Road into the platform, I'm looking forward to continuing the work of building technology that our nation's military leaders can trust when it matters most." Ondrejka has held senior leadership roles across both early-stage companies and some of the world's largest technology organizations. As vice president of Google Experience, Ondrejka served as Google CEO Sundar Pichai's technical strategy advisor and led engineering teams of more than 1,500 people. His responsibilities included improving core consumer technologies and helping teams apply AI across widely used products. Ondrejka also served as vice president of Mobile Engineering at Meta during the pivotal period when Facebook was shifting from a desktop-focused product to a mobile-first platform. As a leader at Meta during this transformation, he created the technology and product experience that enabled Meta to experience explosive growth both before and after its IPO in 2012. Previously, Ondrejka served as CTO of SmartNews, where he led global engineering teams and drove the adoption of artificial intelligence and large language model technologies to improve content discovery, ranking, and system reliability at scale. Earlier, he was the co-creator and CTO of Second Life, the pioneering virtual world developed at Linden Lab and named one of Time magazine's "Best Inventions" of 2002, which helped shape early thinking around shared digital spaces and online communities.

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