Agent Development Kit (ADK) vs. OpenHarness Comparison


Agent Development Kit (ADK) Google	OpenHarness	+	+
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About The Agent Development Kit (ADK) is a flexible, open-source framework for building and deploying AI agents. It is tightly integrated with Google’s ecosystem, including Gemini models, and supports popular large language models (LLMs). ADK simplifies the development of both simple and complex AI agents, providing a structured environment for building dynamic workflows and multi-agent systems. With built-in tools for orchestration, deployment, and evaluation, ADK helps developers create scalable, modular AI solutions that can be easily deployed on platforms like Gemini Enterprise Agent Platform or Cloud Run.	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.
Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Supported On-Premises 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 Not Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience The Agent Development Kit (ADK) is designed for AI developers, researchers, and organizations looking to build, deploy, and manage AI agents using Google’s ecosystem, Gemini models, and a wide array of third-party integrations	Audience Software developers and engineering teams building custom AI-agent applications, including coding agents, CLI tools, and web 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 Not Supported
API Offers API Supported	API Offers API Supported
Screenshots and Videos View more images or videos	Screenshots and Videos No images available
Pricing Free Open source Free Version Supported Free Trial Not Supported	Pricing No information available. Free Version Not Supported Free Trial Not Supported
Reviews/Ratings Overall 5.0 / 5 ease 5.0 / 5 features 5.0 / 5 design 4.0 / 5 Read all reviews	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
Pros & Cons from Real Users Pros ADK feels like a serious framework for people who want to build real agents, not just quick demos. It gives developers a structured way to define agents, connect tools, coordinate multi-agent workflows, and move from local testing toward production. I like that it is open source and supports multiple languages. Python is great for AI work, but TypeScript, Go, Java, and Kotlin support make ADK more realistic for teams building inside existing engineering stacks. The production focus is the biggest advantage. ADK is built around debugging, evaluation, deployment, and reliability, which are exactly the things teams need once an agent goes beyond a prototype. Cons ADK may be more framework than you need for a simple chatbot or one-off automation. If the use case is small, a lighter tool may be faster to set up.
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 Google Founded: 1998 United States google.github.io/adk-docs/	Company Information OpenHarness open-harness.dev/
Alternatives Agno	Alternatives Deep Agents LangChain
Vercel AI SDK Vercel	Mastra Mastra AI
AutoGen Microsoft	Microsoft Agent Framework Microsoft
Mastra Mastra AI	eve Vercel
CrewAI View All	Strands Agents View All
Categories Agentic AI Supported Agentic Orchestration Supported AI Agent Builders Supported AI Agent Frameworks Supported AI Orchestration Supported	Categories AI Agent Frameworks Supported

Integrations AG-UI Supported Agent Control Supported Agent2Agent (A2A) Supported Agentspan Supported Anthropic Not Supported Gemini Supported Gemini Enterprise Supported Gemini Enterprise Agent Platform Supported Google Cloud Run Supported Hindsight Supported Model Context Protocol (MCP) Not Supported OpenAI Not Supported OpenUI Supported Openlayer Supported Prefactor Supported Simaril Supported Vercel AI SDK Not Supported asqav Supported Show More Integrations View All 14 Integrations	Integrations AG-UI Not Supported Agent Control Not Supported Agent2Agent (A2A) Not Supported Agentspan Not Supported Anthropic Supported Gemini Not Supported Gemini Enterprise Not Supported Gemini Enterprise Agent Platform Not Supported Google Cloud Run Not Supported Hindsight Not Supported Model Context Protocol (MCP) Supported OpenAI Supported OpenUI Not Supported Openlayer Not Supported Prefactor Not Supported Simaril Not Supported Vercel AI SDK Supported asqav Not Supported Show More Integrations View All 4 Integrations
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