OpenUI

Open Standard for Generative UI

OpenUI

Open Standard for Generative UI

Without
I need a hotel with a modern design in Paris

Modern Hotels in Paris

Paris offers a wide selection of modern-design hotels that blend contemporary architecture, thoughtful interiors, and premium hospitality. Many of these properties are located in central neighborhoods close to major landmarks, shopping districts, and cultural sites, making them convenient bases for both first-time visitors and returning travelers. Modern hotels in the city often emphasize clean lines, natural materials, curated lighting, and spacious layouts, while still preserving elements of Parisian elegance.

  • Le Horizon — A slim glass tower on the edge of the city centre, pairing minimal suites with a rooftop bar that looks out over Paris at sunset. Guests often choose it for its calm design, attentive service, and sweeping views.
  • Hôtel Atelier — A light-filled modern building a short walk from the Louvre, offering spacious rooms with private balconies, family suites, and a relaxed all-day restaurant, with clean contemporary interiors throughout.

Across the Paris hospitality market, occupancy rates in upscale hotels have remained relatively consistent in recent months, indicating stable demand rather than sharp seasonal swings. Visitors planning a stay should keep in mind that the local currency is the Euro, and everyday experiences often include sampling classic Parisian foods such as macarons, crêpes, pastries, and café dishes. The city's public transportation system, including the metro, buses, and suburban trains, is extensive and efficient.

Nearby, travellers often visit the Musée d'Orsay on the Left Bank, take a sunset cruise along the Seine, browse the design boutiques of Le Marais, or spend an evening moving between the wine bars of Saint-Germain-des-Prés. Many of these experiences can be booked in advance, and some hotels arrange them through their concierge desks.

In terms of timing, spring is popular for its mild weather, blooming streets, and longer daylight hours, while early autumn offers comfortable temperatures and fewer crowds.

With OpenUI
I need a hotel with a modern design in Paris
Without
I need a hotel with a modern design in Paris
With OpenUI
I need a hotel with a modern design in Paris

Loved by 50,000+ developers from

OpenUI Open Source

Make your AI apps and agentsrespond with Interactive UI, Charts, Tables, Forms, Dashboards

Works with the tools you already use.

Works with any model, any frontend framework, and any design system or component library you already use.

  • Your model

    Closed or open, hosted or running on your own machine.

    OpenAI, Anthropic, Gemini, DeepSeek, xAI, Mistral, Qwen, Ollama

  • Your agents

    Add it to your existing agent code. No rewrite needed.

    Vercel AI SDK, LangChain, LangGraph, Convex, Cloudflare, CrewAI, n8n, Haystack

  • Your components

    Bring your own design system and component library.

    OpenUI Design system, shadcn/ui, Material UI, Ant Design, Radix UI, Chakra UI, Mantine, daisyUI

  • Your framework

    Works in the web framework you build with today.

    React, Next.js, Vue, Svelte, Angular, Nuxt, Remix, Astro

Faster answers,
fewer tokens.

3xfaster generation
67%fewer tokens

OpenUI Lang generates up to 3x faster and uses 67% fewer tokens than JSON-based UI formats. Fewer tokens means every generation finishes sooner and costs less.

OpenUI Gateway

OpenUI in production

Make agent responses more reliable in production. Gateway catches and repairs invalid output before users see it.

Keep your existing SDK

Chat Completions and Responses endpoints work with existing SDKs.

Repair before users see it

Fix invalid output as it streams, before it reaches users.

Stay online through outages

Gateway switches providers if one fails, keeping the same model.

Use existing LLM spend

Use your existing model provider credentials and commitments.

Trusted by thousands of developers

14,777 stars13M+ downloads across all packages

Frequently asked questionsFAQs

Have another question?
Join our Discord.

What should I use to build a Generative UI app?

Start with OpenUI and OpenUI Gateway. One command scaffolds a working app: npx @openuidev/cli@latest create. Or let a coding agent do it: Setup for agents in the hero copies a prompt that walks your agent through the same setup.

Gateway gives you free models to build with, and repairs invalid output so broken UI doesn't reach users. The same setup carries into production.

How can I set up my coding agent to use OpenUI?

For a new project, click Setup for agents in the hero and paste the copied prompt into Claude Code, Codex, Cursor, or any other coding agent: it scaffolds the app and verifies the first generated response.

In an existing project, run npx @openuidev/cli@latest setup-agent. It adds OpenUI instructions to AGENTS.md, or creates the file, so your agent knows how to build with OpenUI; run it again any time to refresh them. Projects created with the CLI already include them.

What is OpenUI Lang?

OpenUI Lang is a compact, streaming-first language that LLMs write to build interfaces from your own components.

It is not JSON. Each line defines one component, such as root = Stack([header, chart]), so the interface renders while the response is still streaming.

Across the same 46 interfaces in our benchmark, OpenUI Lang averaged 1,362 output tokens per screen: 58% fewer than json-render and 52% fewer than A2UI, both JSON formats.

Is OpenUI only for chat?

No. OpenUI renders whatever interface a response describes: dashboards, forms, tables, charts, and complete application screens, not only messages in a chat thread.

The same response renders through React, Vue, Svelte, React Native, email, or a plain script tag.

Is OpenUI free and open source?

Yes. OpenUI is fully open source and works with your own components and design system.

Do I need both Gateway and Observability?

No. They work independently.

We recommend using both. Gateway makes generated UI more reliable. Observability shows what users experienced and whether it worked.

How is Thesys related to OpenUI?

Thesys is the company behind OpenUI, much like Vercel is the company behind Next.js.

Thesys maintains the open-source OpenUI framework and operates OpenUI Cloud.