Canvas by Thesys

Intro

Thesys provides a Generative UI foundation for teams building AI products that go beyond text. The platform positions OpenUI Cloud (formerly the C1 API) as a production-ready API for AI-native products and documents the ability to stream production-ready UI components directly from LLM responses. The site references developer examples for Node.js and Python, API keys and documentation, and an Agent Builder for creating AI-driven interfaces.

Key Features

• UI primitives for dashboards, forms, charts, slides, reports and cards.
• OpenUI Cloud (formerly C1 API): a production-focused API with docs and developer examples (Node.js, Python).
• Streaming of production-ready UI components from LLM responses to speed integration.
• Agent Builder to assemble AI-driven interfaces or agents.
• Pricing notes: select models are offered free with “zero LLM costs,” limited to roughly 100 calls/day (~3K/month). Annual billing can save up to 20% and there is a limited-time pricing offer.
• Privacy note: data submitted to free models may be used for training, which is a consideration for sensitive data.

Who this is for

This is practical infrastructure for engineering and product teams building AI-native interfaces — teams that need UI components generated from models rather than plain text. It is aimed at groups evaluating a production-ready API (OpenUI Cloud/C1 API) and teams using the Agent Builder. Review the free-tier limits (~100 calls/day) and the training use notice for free models before routing sensitive data through free endpoints. The public material does not include detailed per-tier paid pricing, SLAs, security certifications, or complete data-retention and deletion policies, so plan to request those details if they are material to procurement or compliance decisions.