抽選・ランダム決定ツール – No-login random decision tools for events & class

Summary: This tool uses the browser’s cryptographic RNG (Web Crypto) to generate fair random decisions locally without login or email. It features a mobile-first UI with fullscreen mode and one-tap result copying, ensuring privacy and offline capability.

What it does

It performs random draws using crypto.getRandomValues entirely on the device, avoiding server-side processing. The interface supports mobile use and projector fullscreen display.

Who it's for

Users needing random selection for events or classes without sharing data or requiring accounts.

Why it matters

It ensures privacy and fairness by processing data locally and enabling offline use without backend dependency.