AI PDF Reader & Chat: Lumen

Lumen turns any PDF into a conversation. Import a document and instantly ask questions, get clear summaries, and understand dense material in seconds — all powered by a built-in AI assistant that reads right alongside you. WHY LUMEN • Ask AI anything — Chat with any PDF. Ask for summaries, explanations, definitions, or key takeaways and get answers grounded in your document. • Highlight to explain — Select any passage and have Lumen explain it in plain language, in full context. • Beautiful, focused reading — A clean reader with System, Light, Sepia, and Night themes for comfortable reading day or night. • Find anything fast — Full-text search with match counts and quick navigation. • Your library, organized — Real cover thumbnails and automatic reading-progress tracking. • Private by design — Your PDFs and conversations stay on your device. LUMEN PRO Unlock unlimited AI chat, every reading theme, and cloud sync with Lumen Pro. Start with a 7-day free trial, then choose weekly or yearly billing. Cancel anytime in Settings. Payment is charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours prior to the end of the period. Manage or cancel your subscription in your App Store account settings after purchase. Have a question or feedback? We'd love to hear from you at [email protected]. Terms of Use (EULA): https://lumen-pdf-backend.vercel.app/terms Privacy Policy: https://lumen-pdf-backend.vercel.app/privacy