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About

OpenHarness is an open-source TypeScript SDK for developers building custom AI-agent applications, including coding agents, CLI tools, and web-based assistants. It provides stateless agent execution, explicit conversation-state handling, streaming events, composable middleware for retries, persistence and context compaction, hierarchical subagents, and permission-controlled tools. Developers can connect model providers through the Vercel AI SDK, add external capabilities through Model Context Protocol (MCP), and use filesystem or shell tools through configurable providers. The SDK also offers React hooks and Vue composables for streaming agent output into application interfaces. OpenHarness is installed as an npm package and is intended to be embedded in projects running on Node.js or edge runtimes; it is a developer library rather than a hosted end-user agent service.

About

assistant-ui is an open source React toolkit for production AI chat experiences, designed to bring the UX of ChatGPT into your own app. It helps developers create beautiful, enterprise-grade AI chat interfaces in minutes for React, React Native, and terminal applications. Whether you are building a ChatGPT clone, a customer support chatbot, an AI assistant, or a complex multi-agent application, assistant-ui provides frontend primitive components and state management layers so you can focus on what makes your application unique. It includes instant chat UI with pre-built, beautiful, customizable chat interfaces out of the box, making it easy to quickly iterate on an idea. Its chat state management is optimized for streaming responses, interruptions, retries, multi-turn conversations, and efficient rendering. assistant-ui is built for high performance, with optimized rendering and a minimal bundle size to keep AI chat interfaces responsive.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

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

Audience

Software developers and engineering teams building custom AI-agent applications, including coding agents, CLI tools, and web assistants.

Audience

Frontend and AI app developers who need production-ready chat components, streaming state management, and flexible integrations for building polished AI assistants

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Supported

API

Offers API Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$50 per month
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

OpenHarness
open-harness.dev/

Company Information

assistant-ui
United States
www.assistant-ui.com

Alternatives

Deep Agents

Deep Agents

LangChain

Alternatives

Mastra

Mastra

Mastra AI
eve

eve

Vercel
Swarm

Swarm

OpenAI

Categories

Categories

Agentic AI Supported
UX Supported

Integrations

Model Context Protocol (MCP) Supported
Anthropic Supported
ChatGPT Not Supported
Claude Not Supported
Claude Duet Not Supported
Claude for Legal Not Supported
Gemini Not Supported
Grok Not Supported
LangChain Not Supported
OpenAI Supported
Perplexity Not Supported
React Not Supported
React Native Not Supported
Vercel AI SDK Supported
shadcn/ui Not Supported

Integrations

Model Context Protocol (MCP) Supported
Anthropic Not Supported
ChatGPT Supported
Claude Supported
Claude Duet Supported
Claude for Legal Supported
Gemini Supported
Grok Supported
LangChain Supported
OpenAI Not Supported
Perplexity Supported
React Supported
React Native Supported
Vercel AI SDK Not Supported
shadcn/ui Supported
Claim OpenHarness and update features and information
Claim OpenHarness and update features and information
Claim assistant-ui and update features and information
Claim assistant-ui and update features and information