A Rapid Serial Visual Presentation (RSVP) speed reading web app. SprintReader displays text one word at a time in a fixed position, eliminating eye movement and highlighting each word's Optimal Recognition Point (ORP) — the letter where the brain recognizes words fastest.

🌐 Try it out here!

Features

• RSVP Reader — word-by-word display with ORP highlighting and adjustable speed (50–1000 WPM)
• Dynamic timing — automatic delays after punctuation (commas, periods, etc.) for natural pacing
• Typography controls — choose from 9 font families and adjust font size and word offset
• Visual aids — optional progress bar, guidelines, word chunks, and control panel
• Word chunk display — optionally display surrounding words around the current word
• Dark / light mode — system-aware theme with a manual toggle
• Persistent settings — all preferences saved to localStorage and restored on next visit
• Demo content — built-in preset texts and longer article excerpts to get started instantly

Keyboard Shortcuts

Key	Action
Space	Play / Pause
← / →	Previous / next word
↑ / ↓	Increase / decrease WPM
Esc	Return to input screen
Mouse wheel	Scroll through words

Contributing

Prerequisites

• Node.js 18+
• npm

Install

npm install

Development

npm run dev

Open http://localhost:5173 in your browser.

Production Build

npm run build
npm run preview   # preview the built output locally

Deployment

This project is deployed using Wrangler and Cloudflare Pages.

npm run deploy

License

MIT