Lumen
Chat with any PDF using AI.
Lumen is a native iOS PDF reader with a built-in AI assistant. Import any document and instantly ask questions, get clear summaries, and understand dense material faster — with a clean, distraction-free reader and Sepia & Night themes for comfortable reading.
- Ask AI — summarize, explain, and question any PDF.
- Highlight to explain — select a passage for an in-context explanation.
- Full-text search and automatic reading-progress tracking.
- Private by design — your documents and chats stay on your device.