Capsule lets you text complete web apps as single SQLite files

Imagine emailing a working web app with its database attached, just like a PDF.

A new tool called Capsule caught eyes on Hacker News, earning 275 points and 117 comments. The platform packages an entire application—its HTML interface, styling, and local SQLite database—into a single .capsule file. You build them using direct AI prompts or Model Context Protocol (MCP) tools, then open them inside Capsule's player.

Why it matters: Most web tools require cloud servers, user accounts, and monthly bills. Capsule strips away that stack. Your code and data live entirely inside one local file, giving you total ownership and complete offline privacy. If you want to share a custom project tracker or tool, you just send the file over AirDrop, email, or WhatsApp.

Know this: The host player is free to download for macOS 12+, 64-bit Windows 10+, and Linux (Ubuntu, Debian, Fedora). Native iOS 16+ and Android 9+ support is coming soon. A web preview exists for quick testing, though browsers cannot save files directly to your local drive.

Software distribution gets a lot simpler when your entire app fits inside an email attachment.