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Ossus

YC W26

San Francisco, US · Founded 2026 · 3 employees · 12 known investors

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Ossus builds software for managing library operations, including cataloging, circulation, and inventory management, with AI-assisted features that automate routine administrative tasks while preserving librarian judgment. The platform serves public libraries and school libraries as a complete system or as add-on agents to existing infrastructure.

Also known as Librar, Inc. · Librar · Librar Labs · Librar, Librar Labs

AI & Machine LearningData & InfrastructureEnterprise SoftwareSaaSCultureAIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (W26)

Ossus was founded in 2026 by Jonathan Görtz, Carl-Hugo Jacobsson, and Kaan Sirin.

JGJonathan Görtz
Jonathan GörtzFounder & ceo2025–2026Jonathan Görtz is founder and CEO of Ossus, a software platform that manages library operations including cataloging, circulation, and inventory management.
CJCarl-Hugo Jacobsson
Carl-Hugo JacobssonCo-founder · Head of Operations
KSKaan Sirin
Kaan SirinCo-founderKaan Sirin is founder of Ossus, which builds software for managing library operations including cataloging, circulation, and inventory management.

Investors · 12

Pioneerlisted by PioneerToronto, Ontario

How we know: Y Combinator's founder network · pioneerfund.vc · open dataset · 5k.vc investor directory · Not right? Tell us

Wave Ventureslisted by Wave VenturesHelsinki

How we know: Wave Ventures's portfolio page · Y Combinator's founder network · Not right? Tell us

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · open dataset · 5k.vc investor directory · Not right? Tell us

20VCreportedLondon · $250K – $5M

How we know: Y Combinator's founder network · Not right? Tell us

Andreessen HorowitzreportedMenlo Park · $500K – $50M

How we know: Y Combinator's founder network · Not right? Tell us

Blast.Clubreported$5.5M

How we know: Y Combinator's founder network · Not right? Tell us

FELIX CAPITALreportedLondon · $1M – $20M

How we know: Y Combinator's founder network · Not right? Tell us

Norrsken VCreportedStockholm · $1.1M – $3.2M

How we know: Y Combinator's founder network · Not right? Tell us

RainmatterreportedBengaluru · $60K – $12M

How we know: press coverage · Not right? Tell us

SSE VenturesreportedStockholm · $52K

How we know: Y Combinator's founder network · Not right? Tell us

The Nordic Web Venturesreported

How we know: Y Combinator's founder network · Not right? Tell us

Funding

SEC filings, press & company announcements
  • Undisclosed amountpre-Series A roundApr 2023
    Source ↗

Source: company announcements and press reports — follow each round's link for the claim.

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Companies working in the same space as Ossus.

Legal entities · 1

corporate structure
Librar, Inc.

In the news

Librar Labs: The AI librarianycombinator.com · Mar 2026Librar Labs - AI for librariansycombinator.com · Jan 2026

Frequently asked questions

What does Ossus do?
Ossus builds software for managing library operations, including cataloging, circulation, and inventory management, with AI-assisted features that automate routine administrative tasks while preserving librarian judgment. The platform serves public libraries and school libraries as a complete system or as add-on agents to existing infrastructure.
Who founded Ossus?
Ossus was founded by Jonathan Görtz, Carl-Hugo Jacobsson, Kaan Sirin in 2026.
Who are Ossus's investors?
Ossus's investors include Florent Venture Partners, Pioneer, Wave Ventures, Y Combinator, 20VC, Andreessen Horowitz, Blast.Club, FELIX CAPITAL and 4 more.
Where is Ossus headquartered?
Ossus is headquartered in San Francisco, US.