The lease is twelve pages and you have one question: what does it cost to break it early? The answer is in there somewhere, wrapped in three clauses of throat-clearing. You could read all twelve pages. Or you could paste the whole thing into a web chatbot and hand a private document to someone else's server.
Marginalias gives you a third option. It runs a document assistant entirely on your iPhone. Open the PDF, ask in plain words, what is the cancellation penalty, and it takes you to the exact passage and sums it up. The same works on a terms-of-service or a research paper, any file where the thing you need is one paragraph out of forty.
Because it all happens on the device, the file never leaves your phone. You can highlight as you go, annotate, and pull out the clauses that actually matter to you. The one answer you came for arrives in seconds, and nothing about the document goes anywhere you didn't send it.
Marginalias is on the App Store, for anyone who gets handed more to read than they have time for.