Fondo · Feb 2026
Secondary roundup describing JSX Tool's browser-based React IDE, key features, and YC-backed launch.
Company research
Public company, workplace, funding, and market signals
Updated Jul 29, 2026
Overview
JSX Tool is a YC-backed browser-first React development tool that combines a Chrome extension with a local dev server to let developers inspect, edit, and style JSX directly in the browser, with AI-assisted prompting and live DOM context.
Primary product
Chrome extension plus local dev server / in-browser IDE for editing and styling React JSX in the browser
Founded
2025
Headquarters
4287 26th St, San Francisco, CA 94131, US
Team size
1-10
Industry
Developer tools
Sub-industry
React development tools / browser-based IDE
Offices
San Francisco, CA, US
Business model
freemium
subscription
open source
Funding
Stage
pre-seed
Total raised
$500K
Latest round
Pre-Seed · Dec 2025
Latest amount
$500K
Dec 2025 · Y Combinator
People & investors
Investors
Work & culture
Engineering-led and product-first, with a browser-first, open-source-friendly approach and a strong focus on AI-assisted React UI workflows.
Product & market
Pricing
Freemium with paid individual and organization subscriptions
Differentiators
- —Inspect any element and jump to the exact JSX source
- —Edit JSX and CSS directly in the browser
- —Pass precise DOM/component context to LLM prompts
- —Live preview and save browser edits back to the filesystem
- —Open-source dev server with LSP, git status, and ripgrep support
Technology
React
TypeScript
Chrome Extension
WebSocket
AWS
OpenAI
Anthropic
Google Gemini
DeepSeek
Tailwind CSS
ESLint
Prettier
LSP
Vite
Next.js
GitHub
Customers
React developers
frontend engineers
teams building React applications
developers using AI-assisted UI editing
Competitors
Chrome DevTools
React DevTools
Onlook
CodeSandbox
StackBlitz
Builder.io
Framer
Plasmic
Buildt
Quod AI
Scale & contact
Latest news
npm registry · Nov 2025
Package registry release page for the open-source dev server, showing the latest published version and repository metadata.
Y Combinator · Nov 2025
YC launch post describing JSX Tool as an in-browser IDE for React, with element-to-JSX navigation, DOM-context prompting, CSS editing, and LSP integrations.
Hacker News · Nov 2025
Launch discussion with founder background, product explanation, and technical details about the dev server, JSX mapping, and free/open-source components.
LinkedIn · Oct 2025
Dan Hyman announced JSX Tool's public launch and emphasized the free base version plus the browser-to-code workflow.
Jobs and careers at JSX Tool
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