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indiPDF vs PDF4QT: catalog facts
indiPDF	PDF4QT
Paid A one-time $35 lifetime licence, with a free trial download.	Free Free and open source; donations are accepted through GitHub Sponsors.
Windows, Linux	Windows, Linux, Command line
Annotations saved as standard PDF objects readable in other viewers Page organizing, merging and splitting built in	Viewing and editing applications in one project Command-line tool for scripted PDF work
Proprietary and paid after the trial No macOS version	No macOS version Mostly the work of a single principal developer
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License: MIT
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.