I'm a researcher collecting PDFs, web pages and notes on my iPhone. What's the simplest app for that?

For early research, the job is gathering without a system getting in your way. Share a paper from Safari or Files, save an article, jot a note. PDFs and documents open in the app and are searchable by what is inside them, and web articles stay readable offline.

A folder for each project keeps things apart, and the AI chat can answer questions from your own saved sources. Treat those answers as a pointer and open the source to check it. On-device AI is the default, and cloud AI runs only if you turn it on, which matters if your sources are sensitive.

If you already have material in Google Drive, Dropbox or iCloud Drive, you can import from them.

When something else fits better: Zotero handles reference metadata, citation styles and bibliographies, which Nemos does not. Readwise Reader is stronger for detailed highlighting and exporting. A common setup keeps Zotero for formal references and Nemos for the wider pile of notes, screenshots and voice ideas.