Seion（静音）

Seion (Seion) is a writing app for composing poetry, prose, short essays, and social media posts on a screen that values whitespace and silence. We aimed to create a creative environment where "the act of writing itself becomes quietly organized."

Main features:
・Font switching between Mincho / Gothic / Serif / Sans, with adjustable font size, line spacing, character spacing, and text width
・Partial text formatting including bold, italic, underline, text color, and fluorescent markers
・Light / Dark theme, and focus mode that hides left and right panels
・Background image settings (with blur and grayscale overlay adjustments)
・Export written text directly as social media images (1:1 / 9:16 / 16:9) in PNG format. Long texts are automatically split into multiple pages and downloaded with sequential numbering
・Signature image insertion (displayed on the final page only)
・Post aspect ratio display — you can write while maintaining the same text layout as the output image
・PWA support — add to your home screen and use it like an app

All data is saved locally on your device (in the browser's localStorage). No server transmission, account registration, or login required.