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With AI, Everyone is a Dev. EveryDev.ai © 2026
    1. Home
    2. Developers
    3. Simon He

    Simon He

    Build practical open-source tools for real workflows, specializing in AI-friendly streaming Markdown renderers and terminal user interfaces.

    Visit Website

    At a Glance

    1Tool Listed
    4Products
    6Capabilities
    Discussions
    Shanghai, ChinaHeadquarters
    2020Est.
    1Employee
    Focus Areas
    AI Development Libraries
    Content Generation
    Conversational Agents
    Connect
    Latest News
    Launch of Markstream 2.0 with support for Vue, React, Svelte, and AngularAug 25, 2026
    Markstream showcased in Ruanyifeng's Weekly for its streaming Markdown capabilitiesAug 25, 2026
    Markets
    • AI Developers
    • Frontend Engineers
    • Open-source Community

    AI Tools by Simon He

    (1)
    View Markstream
    Markstream tool icon

    Markstream

    Streaming Markdown Renderer for LLMs

    AI Dev LibrariesContent GenerationConversational AI

    Discussions

    No discussions yet

    Be the first to start a discussion about Simon He

    Latest News

    08/25/2026

    Launch of Markstream 2.0 with support for Vue, React, Svelte, and Angular

    github.com
    08/25/2026

    Markstream showcased in Ruanyifeng's Weekly for its streaming Markdown capabilities

    github.com
    08/17/2026

    Launch of best-agent-benchmarks project for AI agent evaluation

    github.com
    08/06/2026

    Released vue-tui update featuring terminal math rendering and REPL bar

    github.com

    Products & Services

    4
    Markstream
    2024

    A multi-framework streaming Markdown renderer built specifically for AI-powered chat applications, supporting Vue, React, Svelte, and Angular.

    common-intellisense
    null

    A VS Code extension providing universal component IntelliSense for various UI libraries.

    transformToUnoCSS
    null

    A tool to transform traditional CSS into UnoCSS utilities, facilitating migration to atomic CSS.

    vue-tui
    2026

    A framework for building interactive Terminal User Interfaces (TUIs) using Vue.

    Market Position

    Differentiates by focusing on high-performance 'streaming' rendering for LLM outputs, where standard Markdown libraries often struggle with jitter or re-rendering artifacts.

    Leadership

    Founders

    SH

    Simon He

    Computer Science graduate (2018). Formerly worked in non-tech roles at a Japanese company before transitioning to frontend development in 2020. Prolific open-source contributor and member of the UnoCSS organization.

    Executive Team

    SH

    Simon He

    Founder & Lead Developer

    Shanghai-based engineer specializing in developer experience (DX), agent infrastructure, and AI-friendly tooling.

    Founding Story

    Simon He transitioned from a non-tech role in 2020 to pursue frontend development. Inspired by the open-source spirit of developers like Anthony Fu, he began creating tools to solve developer experience (DX) challenges, eventually leading to the creation of Markstream.

    Business Model

    Revenue Model

    Open-source distribution supported by community contributions and GitHub Sponsors.

    Pricing Tiers

    Open Source
    Free

    MIT Licensed projects available on GitHub.

    Target Markets

    Industries & Segments
    • AI Developers
    • Frontend Engineers
    • Open-source Community
    Use Cases
    • AI Chat Interfaces
    • Developer Documentation
    • Agent Infrastructure
    • Terminal-based AI Tools
    Notable Customers
    • Deepchat
    • Awesome-AITools community

    Quick Facts

    Headquarters
    Shanghai, China
    Founded
    2020
    Employees
    1
    Office Locations
    Shanghai

    History & Milestones

    2026-08-08

    Released Markstream 2.0 roadmap and task checklist.

    2026-08-25

    Released Markstream 2.0 with multi-framework support (Vue, React, Svelte, Angular).

    2024

    Launched Markstream, a specialized streaming Markdown renderer for AI applications.

    2022

    Started open-source journey, becoming a member of the UnoCSS organization.

    2020

    Transitioned to frontend development career after intensive self-study of Vue.js.

    Key Capabilities

    6
    Streaming Markdown rendering
    Progressive Mermaid diagram support
    KaTeX mathematical formula rendering
    Multi-framework compatibility (Vue, React, Svelte, Angular)
    Low-jitter real-time updates
    Terminal UI components

    Integrations & Partnerships

    Platform Integrations

    • VS Code
    • Vue/Nuxt
    • React/Next.js
    • Svelte
    • Angular

    Key Partnerships

    UnoCSS Organization
    Vue Vine
    VS Code Use

    Connect

    Website
    markstream.simonhe.me
    GitHub
    Simon-He95
    Discord
    vkzdkjeRCW

    AI Topics

    3

    Simon He focuses on these topics:

    AI Development Libraries(1)
    Content Generation(1)
    Conversational Agents(1)
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