AgentIndex icon
AgentIndex
CopilotKit logo
CopilotKit
★ 38.2k
vs
sandbase-harness logo
sandbase-harness
★ 635

CopilotKit vs sandbase-harness

CopilotKit: CopilotKit is a React framework for embedding AI copilots, chatbots, and in-app agents directly into web applications. It provides UI components (chat interface, sidebar, textarea) and backend infrastructure for building agentic frontends — where AI can read and modify application state, take actions, and render generative UI. Supports LangChain, LangGraph, CrewAI, and custom agent backends.; sandbase-harness: SandBase Harness is a local-first runtime designed for AI agents, providing essential infrastructure like persistent sessions, sandboxed execution environments, and comprehensive audit trails. It enables secure and observable agent operations directly on your machine or within your own infrastructure, supporting various models and tool integrations.

01

TL;DR

CopilotKit logo
CopilotKitDev Tooling · ★ 38.2k
When to choose:
  • You are building a React, Angular, Vue, or React Native app and need an MIT-licensed frontend layer for in-app AI copilots, generative UI, and human-in-the-loop state sharing.
  • You want to connect your existing LangGraph, CrewAI, or custom agent backend to web apps, Slack, and Microsoft Teams via the AG-UI protocol.
When to skip:
  • You are looking for a backend agent orchestration engine rather than a frontend/UI integration SDK; use CrewAI, Pydantic AI, or LangGraph for the backend.
  • You want a standalone desktop chat client for personal use; use Cherry Studio.
Read CopilotKit full review →
sandbase-harness logo
sandbase-harnessDev Tooling · ★ 635

Running auditable coding agents with controlled and sandboxed code execution.

Read sandbase-harness full review →
02

Side-by-Side Comparison

Field
CopilotKit logoCopilotKit
sandbase-harness logosandbase-harness
Category
Dev Tooling
Dev Tooling
Stars
★ 38.2k
★ 635
License
MIT
Apache-2.0
Install Command
npx copilotkit@latest create
git clone --branch v0.3.8 --depth 1 https://github.com/sandbaseai/sandbase-harness.git && cd sandbase-harness && npm ci && npm run build && mkdir ../my-agents && cd ../my-agents && node ../sandbase-harness/dist/index.js init && node ../sandbase-harness/dist/index.js start
Updated
1d ago
5d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
AI Agents, Frontend Framework, Generative UI
AI Agent Runtime, Sandboxed Execution, Session Management
03

Features

CopilotKit logoCopilotKit
01Drop-in React UI components: chat, sidebar, textarea, and generative UI
02AI can read and write your application's frontend state bidirectionally
03Backend adapters for LangChain, LangGraph, CrewAI, and custom agents
04Human-in-the-loop patterns for approving AI actions before execution
05Copilot Cloud hosted option or fully self-hosted deployment
sandbase-harness logosandbase-harness
01Local, Docker, Kubernetes, and self-hosted worker sandboxes for safe code execution.
02Persistent sessions, resumable event streams, audit logs, and replay capabilities for inspecting long-running agents.
03MCP toolsets, credential vaults, and permission policies for controlling tool access.
04Compatibility with OpenAI, Anthropic, MiniMax, DeepSeek V4, and other OpenAI-compatible model providers.
05Local-first storage with SQLite for metadata and file storage, without a required hosted control plane.
04

Use Cases

CopilotKit logoCopilotKit
↳Adding a context-aware AI copilot to a SaaS product that understands app state
↳Building AI-powered document editors where the agent can directly modify content
↳Embedding a conversational agent in a dashboard that can read and update data
sandbase-harness logosandbase-harness
↳Running auditable coding agents with controlled and sandboxed code execution.
↳Using DeepSeek Harness as an interactive front end for agents, with rich session management.
↳Managing and securing third-party plugins with sandbox and filesystem protection.
↳Building an auditable research agent, combining evidence ledgers with sandboxed execution, credentials, audit, and replay.
↳Self-hosting an AI agent runtime on your own infrastructure for full control and data privacy.
05

Best For

CopilotKit logoCopilotKit
Most PopularEssentialTrending
sandbase-harness logosandbase-harness
Trending
FAQ

FAQ

What is the difference between CopilotKit and sandbase-harness?
Both CopilotKit and sandbase-harness are in the Dev Tooling category. CopilotKit has 38.2k stars, while sandbase-harness has 635 stars.
Which is better, CopilotKit or sandbase-harness?
The best choice depends on your use case. Choose CopilotKit if Adding a context-aware AI copilot to a SaaS product that understands app state, and sandbase-harness if Running auditable coding agents with controlled and sandboxed code execution..
Is CopilotKit free or open source?
Yes, CopilotKit is open source on GitHub (MIT).
Is sandbase-harness free or open source?
Yes, sandbase-harness is open source on GitHub (Apache-2.0).
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Related

Alternatives to CopilotKit →Alternatives to sandbase-harness →CopilotKit details →sandbase-harness details →