LangSmith vs. OpenUI Comparison


LangSmith LangChain	OpenUI Thesys	+	+
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About Unexpected results happen all the time. With full visibility into the entire chain sequence of calls, you can spot the source of errors and surprises in real time with surgical precision. Software engineering relies on unit testing to build performant, production-ready applications. LangSmith provides that same functionality for LLM applications. Spin up test datasets, run your applications over them, and inspect results without having to leave LangSmith. LangSmith enables mission-critical observability with only a few lines of code. LangSmith is designed to help developers harness the power–and wrangle the complexity–of LLMs. We’re not only building tools. We’re establishing best practices you can rely on. Build and deploy LLM applications with confidence. Application-level usage stats. Feedback collection. Filter traces, cost and performance measurement. Dataset curation, compare chain performance, AI-assisted evaluation, and embrace best practices.	About OpenUI is an open-source (MIT) generative UI framework for AI agents. Instead of plain text, your agent writes OpenUI Lang, a compact, streaming-first language, and OpenUI renders it progressively as real UI: charts, tables, forms, cards and layouts. Rendering is safe by default: the model can only use components you register and no generated code is executed, so your design system stays in control. A framework-agnostic core powers first-party runtimes for React, Vue, Svelte and Angular, with ready-made chat interfaces and integrations for LangChain/LangGraph, the Vercel AI SDK, Mastra, Google ADK, assistant-ui, CopilotKit, AG-UI and A2UI. In its published benchmark, OpenUI Lang uses about half the tokens of equivalent JSON UI formats, so interfaces stream faster and cost less.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Supported On-Premises Supported iPhone Supported iPad Supported Android Supported Chromebook Supported
Audience Developers seeking a platform to design, build, and test their applications	Audience Developers building AI agents, copilots and chat apps who want agents to answer with interactive UI instead of text
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Not Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos No images available
Pricing No information available. Free Version Not Supported Free Trial Not Supported	Pricing Free Free Version Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software

Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information LangChain United States www.langchain.com/langsmith	Company Information Thesys Founded: 2024 United States www.openui.com
Alternatives Arize AI	Alternatives LangChain
Braintrust Braintrust Data	Crewship
Griptape Foundry	Agent Communication Protocol (ACP) The Linux Foundation
LangChain	LangGraph LangChain
LangGraph LangChain View All	CopilotKit View All
Categories AI Agent Observability Supported AI Development Supported Context Engineering Supported Debugging Supported Software Testing Supported	Categories AI Development Supported Development Frameworks Supported

Integrations LangChain Supported LangGraph Supported A2UI Not Supported AG-UI Not Supported Agent Development Kit (ADK) Not Supported AgentForge Supported Azure Marketplace Supported CopilotKit Not Supported Disco.dev Supported Mastra AI Not Supported Noma Supported TierZero Supported Vercel AI SDK Not Supported Voker Supported ZenML Supported Show More Integrations View All 9 Integrations	Integrations LangChain Supported LangGraph Supported A2UI Supported AG-UI Supported Agent Development Kit (ADK) Supported AgentForge Not Supported Azure Marketplace Not Supported CopilotKit Supported Disco.dev Not Supported Mastra AI Supported Noma Not Supported TierZero Not Supported Vercel AI SDK Supported Voker Not Supported ZenML Not Supported Show More Integrations View All 8 Integrations
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