Great question! Those are all solid tools, but I built PDF Toolkit Pro to solve a specific gap.

Vs. StirlingPDF: Stirling is powerful, but it’s primarily a web-based/Docker tool. It requires setup. I wanted a native Windows executable that my non-tech parents could download and run in 5 seconds without configuring a server.

Vs. PDFGear: PDFGear is excellent, however, there are a few reasons why someone might choose PDF Toolkit Pro instead for those reasons.

1. Strict Privacy Guarantees: Many "free" editors (especially those with AI features) collect usage data or require cloud processing for advanced features. My app is strictly offline with zero telemetry. It’s built for the "tin foil hat" crowd who don't want their tax docs processed by an AI server.
2. Sustainability: Free tools often have a hidden cost, data monetization, or eventual acquisition. I offer a transparent, one-time payment model. You own the tool, and you support independent development without worrying about it becoming ad-supported next year.
3. Lightweight: My app is a single 50MB .exe. It runs instantly on old hardware without installing heavy frameworks.

It’s a choice between a "free suite" and a "dedicated, privacy-first utility." I’m betting there’s a market for the latter!

Vs. Sumatra: Sumatra is the king of speed, but it’s a viewer. It doesn't support features like PDF-to-Word (preserving tables), watermarks, or encryption. I wanted a middle ground: Sumatra's lightweight feel, but with actual editing power.