OpenSpec is a lightweight, vendor-neutral framework that provides a structured, spec-driven workflow for AI-assisted development.
It enables developers and AI agents to align on requirements, design, and implementation tasks in writing before any code is generated, ensuring that intent is preserved beyond a single chat session.
- 01
Repository-local planning artifacts including proposals, delta specs, designs, and task lists
- 02
Delta-based spec updates for clean integration into existing brownfield codebases
- 03
Support for 30+ AI coding assistants via slash commands
- 04
Explore-first workflow for refining fuzzy ideas before committing to a plan
- 05
Stores beta for sharing specifications and planning context across multiple repositories
Open Source
OpenSpec is free and open-source under the MIT license. It does not require a paid subscription, though users remain responsible for the costs of the AI coding assistants and models they choose to integrate with the framework.
Best for
Meaningful, non-trivial changes in existing repositories where intent, design, and task alignment are critical for successful AI-assisted implementation.
Not ideal for
Tiny, low-risk fixes, throwaway prototypes, or teams that are unwilling to maintain the generated documentation artifacts.
OpenSpec is a highly effective tool for teams and individuals who need to bridge the gap between AI-generated code and long-term project maintainability. It is best applied selectively to complex tasks where the cost of misunderstood intent outweighs the ceremony of writing a spec.
Version 1.11.0 is the latest release. Recent major updates include the introduction of Stores (beta) for cross-repo collaboration, improved support for Zed, enhanced non-English artifact generation, and refined task planning requirements.
As of
Is OpenSpec free?+
Yes - OpenSpec is Open Source. OpenSpec is free and open-source under the MIT license. It does not require a paid subscription, though users remain responsible for the costs of the AI coding assistants and models they choose to integrate with the framework.
Is OpenSpec open source?+
Yes - OpenSpec is open source. OpenSpec is free and open-source under the MIT license. It does not require a paid subscription, though users remain responsible for the costs of the AI coding assistants and models they choose to integrate with the framework.
Who is OpenSpec best for?+
Meaningful, non-trivial changes in existing repositories where intent, design, and task alignment are critical for successful AI-assisted implementation.
Who is OpenSpec not ideal for?+
Tiny, low-risk fixes, throwaway prototypes, or teams that are unwilling to maintain the generated documentation artifacts.
What are the best OpenSpec alternatives?+
The closest OpenSpec alternatives on ai.dosa.dev are Pieces for Developers, agenttrace, Vibe Kanban - all listed under Developer Productivity & Workflow.
Who makes OpenSpec?+
OpenSpec is developed by Fission-AI. It is listed in the Developer Productivity & Workflow category on ai.dosa.dev.
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