Thesys

Thesys builds the generative user interface layer for AI applications. Instead of returning a wall of prose, an application wired to its API can answer with the interface the answer actually needs: a chart, a card, a dashboard, a form, a slide or a report, rendered live and ready to interact with. The company publishes this as OpenUI, which it presents as an open standard for generative interfaces, delivered through a hosted service called OpenUI Cloud. The audience is engineering teams shipping AI products where a text reply is the wrong output, such as analytics assistants, internal tools and reporting workflows. A request to compare advertising spend against sales comes back as a chart rather than a paragraph of numbers. Styling can be customized to match an existing design system, the service supports the major model providers, and a separate Reports API generates slides and multipage documents without consuming model tokens. Billing separates platform calls from model usage. The free tier costs $0 per month, includes 3,000 API calls and requires the customer to bring their own model key. Build is $49 per month with 25,000 calls and $0.002 per call beyond that. Grow is $499 per month with 500,000 calls, $0.001 per call beyond that, higher rate limits, priority support and SSO or SAML. Scale is quoted and covers self hosting or VPC deployment, custom usage controls and contractual guarantees. Model tokens are billed separately at provider rates with no markup, and report artifacts include 100 pages per month free then $0.01 per page operation. The founders previously led engineering and design at DevRev, and the company has raised more than $4 million in seed funding.