OpenSpec

Plan mode for complex features

Y CombinatorWinter 2026ActiveB2B

What they do

Problem

Developers lack durable, lightweight planning context for coding agents when building complex features, leading to misalignment and slower execution.

Solution

An open-source, spec-driven framework that creates lightweight specification documents to guide developers and their coding agents through complex feature development.

Who it's for

Software developers and engineering teams using coding agents to plan and ship features.

Founders

Tabish Bidiwale

Founder

Building OpenSpec, the open-source spec-driven framework that makes AI coding reliable on complex work. 20k+ GitHub stars. Previously Team Lead at Q-CTRL. Joined as an early engineer and built the core platform and multiple products from seed to a $113M Series B. While at Q-CTRL, I saw coding agents recreate the same failure mode as human teams: misalignment. Existing tooling wasn’t built for that shift, which led me to building OpenSpec.

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