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Streamdown

A react-markdown replacement optimized for beautiful, AI-powered streaming markdown.

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Intro

What is Streamdown?

Streamdown is a drop-in replacement for react-markdown, specifically designed for AI-powered streaming. Created as part of the Vercel AI Elements ecosystem, this lightweight library solves the unique challenges that arise when you tokenize and stream markdown content from an AI SDK. It allows developers to seamlessly render stream markdown text, ensuring that unterminated blocks like unclosed code segments, tables, or bold text are fixed and styled beautifully on the fly rather than breaking the UI layout.

Streamdown at a glance
Free, open-source library23K monthly visitsHas free access

Category

AI Developer ToolsAI Chatbot
Best For

Best Streamdown use cases by task, role, industry, and platform

These use cases show where Streamdown fits best, ranked by fit score before popularity or pricing.

Pricing

Streamdown Pricing Plans

Compare Streamdown free options, Streamdown paid pricing plans, and usage notes before you choose the best way to use this AI tool in 2026.

Free, open-source library

Pricing updated:Jun 12, 2026

Features

Streamdown AI Features

Drop-in replacement for react-markdown built for streamingReal-time parsing and styling of incomplete or unterminated Markdown blocksBuilt-in GitHub Flavored Markdown (GFM) support for task lists and tablesBeautiful, interactive code blocks powered by Shiki with hover-to-reveal copy buttonsNative support for mathematical expressions using remark-math and KaTeXInteractive Mermaid diagrams rendered directly from code blocksBuilt-in security hardening to block unexpected link and image origins from prompt injections
Pros & Cons

Streamdown Pros and Cons

Pros

  • Fixes layout breaks caused by incomplete streaming text automatically
  • Comes with rich out-of-the-box features like Shiki code highlighting and KaTeX math
  • Seamless integration with the Vercel AI SDK and Tailwind CSS
  • Highly customizable using standard react-markdown props and custom component mappings

Limitations

  • Requires explicit Tailwind configuration linking to node_modules for styles to work
  • Adds dependencies like Shiki and KaTeX which developers might need to configure for bundle sizes

Streamdown FAQ

Streamdown features built-in security hardening. It ensures that untrusted markdown does not execute unsafe elements or include showing links with streamdown that point to unexpected, unverified origins that could be vulnerable to prompt injection.

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