AI SDK & Agent Framework · for Next.js

AI SDK & Agent Framework for Next.js

Among 40 makers' products we track that are built with Next.js, here's what they chose for AI SDK & agent framework — each counted from a live-product source.

Broad framework or thin SDK. Broad frameworks come with integrations for loaders, vector stores and memory, but add layers of abstraction you have to learn and debug. Thin SDKs give you a typed agent loop close to the raw API and leave the rest to you. An agent harness goes further the other way: the whole loop — file access, shell, context management — comes ready-made, for agents that work inside a workspace.

What makers on Next.js chose

Counts are live products with a source, not market share; a product using two options counts in both.

LangChainBroad framework

llms.txt

Best forThe largest set of ready-made integrations for models, tools and data sources, in Python and JavaScript.

Trade-offLayers of abstraction make debugging harder, and the API has changed often.

20 of the 40 Next.js products here · free tier · open source

MastraTypeScript framework

llms.txt CLI

Best forTypeScript and Next.js apps that want agents, workflows, memory and RAG without a Python service.

Trade-offYounger ecosystem, and some enterprise features sit under a separate source-available license.

10 of the 40 Next.js products here · free tier · open source

LlamaIndexBroad framework

llms.txt

Best forAgents that mostly retrieve and reason over your own documents.

Trade-offLess natural for agents whose work is mostly calling external tools rather than reading data.

7 of the 40 Next.js products here · free tier · open source

CrewAIMulti-agent orchestration

llms.txt

Best forPython projects that split work across several role-based agents, like researcher, writer and reviewer.

Trade-offMulti-agent setups cost more tokens and are harder to predict than one well-prompted agent.

2 of the 40 Next.js products here · free tier · open source

AI SDKThin SDK

Best forTypeScript agents with tool calling, multi-step loops and streaming to the UI, on any model provider.

Trade-offMemory, workflows and evals are left to you or other libraries.

2 of the 40 Next.js products here · free tier · open source

Also real options for AI SDK & agent framework, not seen among these Next.js products yet: OpenAI Agents SDK, Pydantic AI, Claude Agent SDK, LangGraph.