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pdfgrep vs Clapgrep: catalog facts
pdfgrep	Clapgrep
Free Free software under the GPL version 2 or later.	Free Free and open source under the GPL-3.0-or-later licence.
Linux, Command line	Linux
Familiar grep options such as -r, -i, -n and -c Searches many PDFs at once	Searches inside PDF files as well as plain text Searches a whole folder in one pass
Command line only Only searches text layers, so scanned PDFs without OCR return nothing	Linux only Small project maintained by a single developer
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0-or-later
No account 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.