Markstream is a family of streaming Markdown renderers designed for AI applications. It supports Vue, React, Svelte, Angular, Nuxt, and Next.js, enabling progressive rendering of LLM token streams, SSE/WebSocket output, and long documents with Mermaid diagrams, KaTeX math, and streaming code blocks. It offers customization through parser hooks, component overrides, and custom tags for building high-performance AI chat interfaces and documentation sites.
In the Developer Tools space, Markstream takes a focused approach. It focuses on rendering streaming LLM token output and AI chat messages as progressive Markdown with diagrams and code blocks in frontend apps. It is built as an open-source project for frontend developers building AI chat UIs. Markstream is open source under the MIT license. Markstream is available on the web, and it can be self-hosted.
Simon He builds and maintains Markstream, and the product first shipped in 2025. Development happens publicly on GitHub with 2.7k stars and 1.2k commits in the last 90 days. Key capabilities include Streaming Markdown, Mermaid Support, and KaTeX Rendering. The interface is available in English and Chinese.
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