OpenSpec
Plan mode for complex features
OpenSpec is an open-source, spec-driven framework. We help developers plan complex features by creating lightweight spec documents that serve as durable context for their coding agents. With 20k+ GitHub stars, we’re one of the leading spec-driven frameworks, used by thousands of developers and teams to plan and ship with the coding agent of their choice. Our philosophy is simple: keep planning lightweight and iterative, and match how software actually gets built, messy, evolving, and real, without dragging teams into rigid, bureaucratic workflows.
- Website
- openspec.dev
- City
- San Francisco
- Country
- United States
- YC batch
- Winter 2026
- Stage
- Early stage
- AI-native
- No
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