I built a 3D engine that turns PDFs into playable study worlds
3D memory palace from PDFs sounds cool, but AI study apps and Anki-like tools already saturate ed-tech.

Local-first PDF reader with page-grounded AI when ChatPDF sends everything to the cloud.
Students, researchers, and developers reading technical documentation
ChatPDF · PDF.ai · Humata
While reading, I needed something to do. I wanted to talk to the text, I wanted to leave notes, I wanted to use to use my keyboard to quickly flip through pages.
The only good available option on a Mac was "Preview" and it was ok, but definitely not there. So I built Quincy primarily for myself.
With it you can - "Talk" to the page you're reading, create a quiz about the page, and get a good summary - "Read" the page out-loud. Have your Mac read to you while you follow along. This helps with comprehension. - Copy text (to paste into an LLM), leave notes, bookmarks, etc.... - Anything else you'd want with a nice PDF reader
It's fully local. No cloud-sync (yet). All LLM calls are based on your keys. And TBH, you don't even need to use the AI features for this to be useful.
Try it out. Let me know what you guys think. This has been a quick project, so very rough around the edges. I plan on keeping it going (still haven't finished my book), and potentially open-sourcing down the line.
3D memory palace from PDFs sounds cool, but AI study apps and Anki-like tools already saturate ed-tech.
RSVP reader with genuine accessibility features like Irlen overlays and OpenDyslexic fonts.
Another HTML-to-PDF API when Puppeteer and PrinceXML already solve this.
PDF-native AI chat beats copy-paste workflow, but specialized readers crowding fast.
Useful list, but it's just a static directory of apps everyone already knows.
Another AI PDF reader when ChatPDF and Humata already dominate this space.