The best CopilotKit alternatives in 2026
Five alternatives to CopilotKit, sorted by whether you want to build the agent or have one, with prices from each product's own site.
Quick answer
If you want to keep building your own in-app agent, the closest CopilotKit alternatives are assistant-ui (MIT-licensed React chat components with an optional cloud), the Vercel AI SDK (a free, open-source TypeScript toolkit with chat hooks) and OpenAI ChatKit (an embeddable chat interface backed by your own server). Tambo is open source too, but its cloud closes on 31 October 2026. If you would rather have the agent than build it, Verb sets one up inside your product.
An obvious bias first: I build Verb, one of the five options below. I have tried to say plainly what each of the others is good at and who should pick it over Verb.
CopilotKit is a stack for putting an AI agent inside your app's interface and connecting it to the agent backend your team runs. People look for alternatives for different reasons: a different license, a different price model, a smaller piece of the stack, or not wanting to build the agent at all.
Every claim below about another product comes from its own site, read on 30 October 2026. The pages are listed at the end so you can check them.
First: build the agent, or have one?
The first four options here are toolkits. They give your engineers the parts, and your team writes the agent, decides what it may do and keeps it working as the product changes. The fifth is an agent you set up rather than build. Which one you want decides more than any feature list.
1. assistant-ui
What it is. In its own words, "components, runtimes, and primitives for building AI chat interfaces" in React, Vue, React Native and the terminal. It supports tools, including tools that run in the browser, and has an approval card for an agent that asks before a consequential action. It works with many backends, among them the Vercel AI SDK, LangGraph, Mastra, the OpenAI Agents SDK and your own API.
What it costs. The library is MIT-licensed and free. Its optional hosted cloud has a free tier up to 200 monthly active users, then Pro at $50 a month for 500, plus $0.10 for each one after that, and a custom Enterprise plan.
Who it suits. Teams who want polished chat UI pieces and already have, or will write, the agent behind them.
2. Vercel AI SDK
What it is. "The TypeScript toolkit for building AI applications and agents", made by the Vercel and Next.js team. It covers model calls across providers, tools, structured output, and UI hooks such as useChat for building chat interfaces.
What it costs. Free and open source. You pay your model provider directly.
Who it suits. TypeScript teams who want the lowest-level, most flexible starting point and are happy to assemble the rest themselves.
3. OpenAI ChatKit
What it is. An embeddable chat interface from OpenAI, which it calls "the best way to build agentic chat experiences". It handles the chat UI, file attachments and tool calls. Your server creates the session and passes a unique user for each person.
Worth knowing. ChatKit can connect to a workflow hosted in OpenAI's Agent Builder, but OpenAI says Agent Builder is scheduled to shut down on 30 November 2026, and it recommends running ChatKit against your own server for new work.
Who it suits. Teams already building on OpenAI who want a ready-made chat surface and will run the agent on their own server.
4. Tambo
What it is. "An open-source toolkit for adding agents to your React app." You register your existing React components and the agent renders them with the right props, which suits apps where the answer should be a piece of your own interface rather than text.
Worth knowing. Tambo Cloud shuts down on 31 October 2026 and has closed new sign-ups. Self-hosting stays free.
Who it suits. React teams who want generative UI built from their own components and are prepared to host it themselves.
5. Verb
What it is. Verb is an AI agent that sits inside your product and does the work your users ask for, as the signed-in user, through the API your product already has. You describe what it may do, try it on a test copy of your app, and add one script tag. It is integrated in under an hour in most cases.
What it costs. It starts with a free 30-day pilot. I set it up with you, we measure the requests it handles and the time it saves, and agree a price from those numbers.
Who it suits. Products with active users and a workflow those users get stuck in, where the team wants the agent working rather than a project to build one. It does not suit a team whose agent is the product itself and who wants to own every line of it; one of the toolkits above is the better choice there. Verb vs CopilotKit compares the two directly.
And CopilotKit itself
For comparison, CopilotKit's pricing page lists a free Developer Edition for building and testing on your own machine, a hosted free tier of 1,000 interactions a month per organization, Pay as you go at $49 a month for the first 10,000 interactions, and custom annual plans.
The verdict
- Want chat UI parts for an agent you write: assistant-ui.
- Want the most flexible low-level toolkit: the Vercel AI SDK.
- Building on OpenAI and running your own server: ChatKit.
- Want answers rendered as your own React components: Tambo, self-hosted.
- Want the agent working in your product without building it: Verb.
If you are still deciding whether to build at all, how to add AI to an app you already have starts a step earlier.
Sources
Each read on 30 October 2026.
Frequently asked questions
What is the best open-source alternative to CopilotKit?
assistant-ui and the Vercel AI SDK. assistant-ui is MIT-licensed React components for AI chat, with an optional hosted cloud. The AI SDK is a free, open-source TypeScript toolkit from Vercel with hooks such as useChat. Tambo is open source and free to self-host, but its hosted cloud closes on 31 October 2026.
Is CopilotKit free?
Partly. As of 30 October 2026 its pricing page lists a free Developer Edition for non-production use, a hosted free tier of 1,000 interactions a month per organization, Pay as you go at $49 a month for the first 10,000 interactions, and custom annual plans.
What is the difference between CopilotKit and the Vercel AI SDK?
The AI SDK is a general toolkit for building AI applications and agents in TypeScript: model calls, tools and chat hooks. CopilotKit is built around putting an agent inside your app's interface and connecting it to the agent backend you run. Both expect your team to build and run the agent.
Is there a CopilotKit alternative where I don't build the agent?
Yes. The other options here are toolkits: your team writes the agent and keeps it working. Verb is the agent. You describe what it may do in your product, it does that work for the signed-in user, and it is integrated in under an hour in most cases.
Vishnu, founder of AskVerb @itsvishnups
Building the AI agent that lives inside a SaaS product and does the work its users ask for. Writing down what I learn along the way, including the parts I got wrong first.