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Million

million.dev

React compiler optimizing virtual DOM diffing for faster renders with minimal changes.

Overview

Million is an open-source software company building developer tools and datasets to help developers and AI coding agents build better web applications. Their mission is to fix the web by providing tools that help developers find and fix issues in their applications.

The company develops tools like React Doctor and React Scan, which have been widely adopted by developers. They also build ReactBench alongside custom datasets and reinforcement learning environments designed to train and evaluate frontier coding agents on realistic web development tasks.

Million is backed by prominent investors including Y Combinator (W24) and a network of experienced founders and technologists.

Key features

  • React Doctor tool
  • React Scan tool
  • ReactBench benchmarking
  • Custom datasets for AI training
  • Reinforcement learning environments
  • Open-source tools
Pros
  • Open-source and freely available
  • Tools widely adopted by developers
  • Backed by experienced investors and Y Combinator
  • Designed for both human developers and AI agents
Cons
  • Limited information about specific features and capabilities
  • No clear pricing or commercial offerings mentioned
Use this if
You are a web developer working with React applications and want free tools to identify and fix performance issues, or you are training AI coding agents on realistic web development tasks.
Skip this if
You need commercial support, managed hosting, or proprietary tools with guaranteed SLAs.

Best for

Web developers optimizing React applicationsTeams using AI coding agentsDevelopers debugging web performance issues

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