ContractSpecOpen spec system

Start with OSS

ContractSpecOpen spec system

Product
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Start with OSS

Features
Presentation Runtime
Events

Events

Events defined in Presentation Runtime

presentation.rendered

presentation.transformed

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Release notes, template drops, Studio updates, and the product thinking behind them.

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ContractSpec

The open spec system for AI-native software.

Start with the OSS foundation when you want explicit contracts, safe regeneration, and multi-surface consistency. Move into Studio when you want the operating layer on top.

Open system

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Templates
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Studio

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Built with ContractSpec

LLM guide Start with OSS Explore Studio