Subscription-based model (though a one-time purchase is often available for specific versions).
If you are currently on an older version (like 9.x or early 10.x), is a highly recommended update for the stability and indexing speed alone. It remains one of the best "second brain" tools for anyone who treats their PDF collection as a primary knowledge base. PDF Search 10.12
While 10.12 is part of the broader version 10 lifecycle, it focuses heavily on and macOS Sonoma/Sequoia compatibility . 000+ pages) without significant CPU spikes.
: This version leverages "contextual" search, meaning it can often find keywords even if they are slightly misspelled or hyphenated across line breaks. PDF Search 10.12
: Version 10.12 introduced a refined indexing engine that handles large libraries (10,000+ pages) without significant CPU spikes.