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OpenSpec

YC W26

Sydney, AU · Founded 2025 · 1 employees on LinkedIn · 7 known investors

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OpenSpec is a lightweight, spec-driven framework for planning and organizing requirements in codebases, designed to work with AI coding agents like Claude Code, Cursor, and GitHub Copilot. It stores specifications alongside code to provide persistent context for development teams and enable reviewers to understand requirement changes without reading code.

Also known as FISSION AI, INC · FISSION · FISSION, OpenSpec, openspec

AI & Machine LearningDeveloper ToolsEnterprise SoftwareAustraliaOceania

Founders & leadership· Y Combinator alumni (W26)

OpenSpec was founded in 2025 by Tabish Bidiwale.

TBTabish Bidiwale
Tabish BidiwaleFounderTabish Bidiwale was a team lead at Q-CTRL, where he joined as an early engineer and helped develop platform infrastructure and products through Series B funding. He founded OpenSpec, an open-source specification-driven framework designed to improve reliability in AI-assisted development.

Investors · 7

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

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

Blast.Clubreported$5.5M

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

Commit CapitalreportedSan Francisco

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

Kevin Linreported

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

Peak XV PartnersreportedBengaluru · $100K – $10M

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

Tekedia CapitalreportedLagos · $1K

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Legal entities · 1

corporate structure
FISSION AI, INC

In the news

OpenSpec: The Spec Framework for Coding Agentsycombinator.com · Mar 2026

Frequently asked questions

What does OpenSpec do?
OpenSpec is a lightweight, spec-driven framework for planning and organizing requirements in codebases, designed to work with AI coding agents like Claude Code, Cursor, and GitHub Copilot. It stores specifications alongside code to provide persistent context for development teams and enable reviewers to understand requirement changes without reading code.
Who founded OpenSpec?
OpenSpec was founded by Tabish Bidiwale in 2025.
Who are OpenSpec's investors?
OpenSpec's investors include Pioneer, Y Combinator, Blast.Club, Commit Capital, Kevin Lin, Peak XV Partners, Tekedia Capital.
Where is OpenSpec headquartered?
OpenSpec is headquartered in Sydney, AU.