CopilotKit vs LangChain vs LangGraph vs Vercel AI SDK
A side-by-side look at scores, pricing and features — with RECATOOLS' ASEAN-aware verdict for each.
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LangChain
Most popular framework for building LLM applications
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LangGraph
Open-source graph framework for durable, stateful AI agents
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Vercel AI SDK
Provider-agnostic TypeScript SDK for streaming AI apps
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| RECATOOLS Score | 7.8 / 10 | 8.1 / 10 | 8.3 / 10 | 8.4 / 10 |
| Capability | ||||
| Value for money | ||||
| Ease of use | ||||
| ASEAN readiness | ||||
| API quality | ||||
| Pricing | Freemium | Open Source | Freemium | Open Source |
| Free tier | — | Open source framework is free; LangSmith has a free developer tier | — | — |
| Paid from | — | $39/month (LangSmith Plus) | — | — |
| Has API | ✓ | ✓ | ✓ | ✓ |
| Open source | ✓ | ✓ | ✓ | ✓ |
| Free to use | ✓ | ✓ | ✓ | ✓ |
| Users | — | 1m+ developers | — | — |
| Founded | — | 2022 | — | 2023 |
| Maker | — | Harrison Chase | — | — |
| Verdict | Most agent frameworks stop at the backend and leave you to hand-roll the chat window, the streaming, the human-in-the-loop approvals. CopilotKit owns that missing layer — the interface between users and agents — and it's... |
Still the default starting point for LLM apps, and meaningfully more stable since LangChain 1.0 and LangGraph 1.0 shipped in October 2025 — agents now run on LangGraph's durable runtime, and the team has promised no brea... |
LangGraph has genuine production mileage that most agent frameworks can only cite in a blog post: Klarna's customer-support assistant runs on it at 85 million users, Replit Agent's multi-step app-building flow is built o... |
The Vercel AI SDK has become the default way JavaScript developers wire an LLM into an app — a single interface over OpenAI, Anthropic, Google and more than a dozen other providers, with streaming, structured output and... |
| Full review → | Full review → | Full review → | Full review → |
Comparisons cover up to 4 tools. Scores are RECATOOLS editorial assessments; verify current pricing on each vendor's site.