Underscore – Code with AI in the browser, zero setup required

Show HN: Underscore – Code with AI in the browser, zero setup required

Underscore – Code with AI in the browser, zero setup required is a company in show hn launch.

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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 storageAccess from any browser75+ 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)M

Within the show hn launch space, the company focuses on its core offering rather than a broad product line.

Directory data places it at the Show HN launch stage.

Website: app.underscore.is