UI alternatives
UI by Vercel Labs costs Free (OSS) and is open source. If you need something cheaper, open source, self-hosted or simply different, here are 10 alternatives that do the same job, ranked by how widely they are used, with the differences that matter.
10 UI alternatives, by popularity
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A framework for building LLM applications and agents from composable parts: model integrations, tools, retrievers and prebuilt agent abstractions. Available for Python and JavaScript.
- Works with local models
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A low-level orchestration framework for building stateful agents as graphs, with durable execution, persistence and human-in-the-loop steps. Available for Python and JavaScript.
- Works with local models
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Vercel's TypeScript toolkit for building AI applications and agents, with one API across model providers and UI helpers for streaming.
- Works with local models
- Growing fast: usage up 31% in 30 days
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Anthropic's SDK that exposes the agent loop, tools and context management behind Claude Code, for building custom agents in Python and TypeScript.
- Growing fast: usage up 27% in 30 days
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OpenAI's lightweight framework for multi-agent workflows, with handoffs, guardrails, sessions and tracing. Available for Python and TypeScript. Per its PyPI page it is provider-agnostic, supporting the OpenAI Responses and Chat Completions APIs as well as 100+ other LLMs.
- Growing fast: usage up 30% in 30 days
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A TypeScript framework for building agents and AI workflows, with memory, evals, retrieval and observability built in.
- Works with local models
- Growing fast: usage up 38% in 30 days
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A batteries-included agent harness built on LangGraph, with planning, a virtual file system and sub-agents for long-running tasks.
- Works with local models
- Growing fast: usage up 40% in 30 days
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AWS's open-source SDK for building and running AI agents in Python and TypeScript: a model-driven agent loop that runs in your own process with no hosted control plane; the same repository holds a harness, a CLI, MCP support and evals.
- Works with local models
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Google's open-source, code-first toolkit for building, evaluating and deploying AI agents, with SDKs for Python, TypeScript, Go, Java and Kotlin.
- Works with local models
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A minimal Hugging Face library for agents that write and run Python code as their actions.
- Works with local models
- Growing fast: usage up 53% in 30 days
UI vs alternatives at a glance
| Agent | Price | Free to start | Open source | MCP | Local models | Gid Score |
|---|---|---|---|---|---|---|
| UI | Free (OSS) | ✓ | ✓ | ? | ? | — |
| LangChain | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 79 |
| LangGraph | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 74 |
| AI SDK | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 67 |
| Claude Agent SDK | Free (OSS) | ✓ | ✓ | ✓ | ? | 64 |
| OpenAI Agents SDK | Free (OSS) | ✓ | ✓ | ✓ | ? | 61 |
| Mastra | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 59 |
| Deep Agents | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 58 |
| Strands Agents | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 55 |
| Agent Development Kit (ADK) | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 55 |
| smolagents | Free (OSS) | ✓ | ✓ | ✓ | ✓ | 54 |
Prices from the vendors' pricing pages; features from official docs (“?” means not documented). Full feature comparison · All prices
How teams use these tools
How Bayer Crop Science built a multi-agent decision engine on Amazon Bedrock AgentCore
Bayer Crop Science built the Agentic Decision Engine, a multi-agent natural language interface over its Connected Decision Engine for ML workflows, hosted on Amazon Bedrock AgentC…
As reported by AWS, ADE resolves about 80 percent of user questions without an engineer in the loop.
Run LangChain's Open Deep Research multi-agent pipeline locally
LangChain's open-source deep research agent, built on LangGraph, runs research sub-agents in parallel, compresses what they find and writes a final report. It works with many mode…
On Deep Research Bench, the default GPT-4.1 configuration scored 0.4309 and the GPT-5 configuration 0.4943. (as reported by LangChain)
Build a CI-health monitoring agent with the Claude Agent SDK and GitHub MCP
In this Anthropic cookbook notebook, an agent gets the official GitHub MCP server and is told to look over recent CI runs. It reports failing jobs, flaky patterns and recommended …
A status summary of recent CI runs and what triggered them. (as reported by Anthropic)
FAQ
What is the best alternative to UI?
By usage, the closest alternative is LangChain, followed by LangGraph, AI SDK, Claude Agent SDK.
Is there a free alternative to UI?
Yes. LangChain is free to start.
Is there an open-source alternative to UI?
Yes. LangChain is open source.
How do these UI alternatives compare on price?
LangChain: Free (OSS); LangGraph: Free (OSS); AI SDK: Free (OSS); Claude Agent SDK: Free (OSS); OpenAI Agents SDK: Free (OSS); Mastra: Free (OSS).
UI: pricing, features and stats · All agent frameworks and SDKs · Find the right agent in 4 questions