# Best AI agent frameworks, ranked by real usage

the week of Oct 25–31, 2026. Canonical page: https://index.devtoolwatch.com/categories/agent-frameworks/

| Rank | Tool | Stars | Downloads/wk |
|---|---|---|---|
| #1 | [Harness²](https://index.devtoolwatch.com/tools/google-research-harness2/) | 21.7k | – |
| #2 | [HyperFrames](https://index.devtoolwatch.com/tools/heygen-com-hyperframes/) | 76.6k | 1.5M |
| #3 | [AgentScope](https://index.devtoolwatch.com/tools/agentscope-ai-agentscope/) | 35k | 51.4k |
| #4 | [AG-UI](https://index.devtoolwatch.com/tools/ag-ui/) | 16.9k | 4.6M |
| #5 | [LangGraph](https://index.devtoolwatch.com/tools/langgraph/) | 44.2k | 18.5M |
| #6 | [Bifrost](https://index.devtoolwatch.com/tools/maximhq-bifrost/) | 9.3k | – |
| #7 | [assistant-ui](https://index.devtoolwatch.com/tools/assistant-ui/) | 12.9k | 2.8M |
| #8 | [Mastra](https://index.devtoolwatch.com/tools/mastra/) | 29.2k | 3.1M |
| #9 | [Deep Agents](https://index.devtoolwatch.com/tools/deepagents/) | 30.8k | 2.5M |
| #10 | [Vercel AI SDK](https://index.devtoolwatch.com/tools/ai-sdk/) | 27.7k | 42.6M |
| #11 | [OpenAI Agents SDK](https://index.devtoolwatch.com/tools/openai-agents/) | 30.4k | 6.9M |
| #12 | [Pydantic AI](https://index.devtoolwatch.com/tools/pydantic-ai/) | 21k | 1.7M |
| #13 | [Dify](https://index.devtoolwatch.com/tools/dify/) | 160.1k | – |
| #14 | [Claude Agent SDK](https://index.devtoolwatch.com/tools/claude-agent-sdk/) | 8.4k | 25.6M |
| #15 | [smolagents](https://index.devtoolwatch.com/tools/smolagents/) | 30.2k | 152.7k |
| #16 | [CopilotKit](https://index.devtoolwatch.com/tools/copilotkit/) | 38.4k | 653.6k |
| #17 | [SkillOpt](https://index.devtoolwatch.com/tools/microsoft-skillopt/) | 18.8k | 6.4k |
| #18 | [MemOS](https://index.devtoolwatch.com/tools/memtensor-memos/) | 12.2k | 529 |
| #19 | [Google ADK](https://index.devtoolwatch.com/tools/google-adk/) | 22.1k | 2.4M |
| #20 | [n8n](https://index.devtoolwatch.com/tools/n8n/) | 209.2k | 147.7k |
| #21 | [Strands Agents](https://index.devtoolwatch.com/tools/strands/) | 9k | 8.9M |
| #22 | [A2A Protocol](https://index.devtoolwatch.com/tools/a2a/) | 26.4k | 2.9M |
| #23 | [Agno](https://index.devtoolwatch.com/tools/agno/) | 43k | 514.9k |
| #24 | [DSPy](https://index.devtoolwatch.com/tools/dspy/) | 38.9k | 1.3M |
| #25 | [Ray](https://index.devtoolwatch.com/tools/ray-project-ray/) | 44.2k | 3.7M |
| #26 | [Microsoft Agent Framework](https://index.devtoolwatch.com/tools/ms-agent-framework/) | 14.4k | 47.3k |
| #27 | [AgentKit by Inngest](https://index.devtoolwatch.com/tools/agent-kit/) | 959 | 37.9k |
| #28 | [Haystack](https://index.devtoolwatch.com/tools/haystack/) | 26.9k | 140.8k |
| #29 | [VoltAgent](https://index.devtoolwatch.com/tools/voltagent/) | 10.9k | 49.8k |
| #30 | [Oumi](https://index.devtoolwatch.com/tools/oumi-ai-oumi/) | 9.4k | 9.6k |
| #31 | [CrewAI](https://index.devtoolwatch.com/tools/crewai/) | 60.4k | 589.4k |
| #32 | [Semantic Kernel](https://index.devtoolwatch.com/tools/semantic-kernel/) | 28.7k | 83.4k |
| #33 | [LangChain](https://index.devtoolwatch.com/tools/langchain/) | 148.8k | 41.1M |
| #34 | [AutoGen](https://index.devtoolwatch.com/tools/autogen/) | 61.7k | – |
| #35 | [MetaGPT](https://index.devtoolwatch.com/tools/metagpt/) | 71.1k | – |
| #36 | [Langflow](https://index.devtoolwatch.com/tools/langflow/) | 156.2k | 8.3k |
| #37 | [elizaOS](https://index.devtoolwatch.com/tools/eliza/) | 19.7k | 7.6k |
| #38 | [Agent Lightning](https://index.devtoolwatch.com/tools/agent-lightning/) | 18.9k | 3.4k |
| #39 | [LangChain4j](https://index.devtoolwatch.com/tools/langchain4j/) | 13.3k | – |
| #40 | [Spring AI](https://index.devtoolwatch.com/tools/spring-ai/) | 9.6k | – |
| #41 | [LlamaIndex](https://index.devtoolwatch.com/tools/llamaindex/) | 52.8k | 1.5M |
| #42 | [CAMEL](https://index.devtoolwatch.com/tools/camel/) | 18k | 15.3k |
| #43 | [Flowise](https://index.devtoolwatch.com/tools/flowise/) | 55.5k | 5.6k |
| #44 | [Agentic Context Engine](https://index.devtoolwatch.com/tools/kayba-ai-agentic-context-engine/) | 2.6k | 2.5k |

## FAQ

### What is the fastest-growing of the AI agent frameworks right now?

Harness² ranked #1 among AI agent frameworks on the Devtoolwatch Board in the week of Oct 25–31, 2026, with a momentum score of 95 out of 100.

### Which of the AI agent frameworks has the most GitHub stars?

Of the AI agent frameworks ranked in the week of Oct 25–31, 2026, n8n has the most GitHub stars: 209.2k.

### Which of the AI agent frameworks is downloaded the most?

Vercel AI SDK's main package had the most downloads of the ranked AI agent frameworks: 42.6M in the week of Oct 25–31, 2026.

### How does Devtoolwatch rank AI agent frameworks?

Every Monday the Board averages four percentile ranks: new GitHub stars from daily snapshots, new stars for the repo's size, added npm and PyPI downloads, and download growth beyond the market. Star spikes without forks, downloads or Hacker News to back them are held back.