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