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I built Underscore a browser-based coding environment that runs entirely in the cloud. There’s no local setup, CLI, or Docker—open the site and start coding with AI assistance from any device. Each project runs in its own persistent cloud container (Cloudflare) with common languages and tools preinstalled (Node.js, Python, Go, Rust, Bun, etc.). It’s built on top of opencode (https://opencode.ai
), an open-source AI coding agent. Features: Cloud containers with persistent storage Access from any browser 75+ AI models (Claude Sonnet 4.5, GPT-5.2 Codex, DeepSeek R1, etc.) Project templates (AI agents, serverless functions, web apps, APIs, E2E tests) GitHub integration (clone repos, push changes back) MCP directory with one-click setup for 20+ services (GitHub, Linear, AWS, Sentry, PostgreSQL, etc.) Automatic public preview URLs for dev servers Built-in terminal and file browser (code editor coming soon) Status: Beta. Core workflows work, but there are rough edges. I’d love feedback from HN on what’s useful, what’s missing, and where this fits (or doesn’t) in your workflow. Happy to answer questions about the architecture or AI integration. |