About KDP Sentinel Pro
We build free tools that help self-published authors avoid costly mistakes. Our royalty calculators, trademark scanners, and compliance checkers have helped thousands publish safely on Amazon KDP.
Arun Kumar
Founder & Lead Developer
Chennai, India
In 2023, I lost my KDP account. 47 books. Years of work. Gone overnight because of a trademark term I didn't know was protected. Amazon's email said "repeated policy violations"—but I had no idea I was even violating anything.
After months of research and failed appeals, I realized the problem: there was no easy way to check for these issues before publishing. So I built the tools I wish I had. First for myself, then for other authors.
KDP Sentinel Pro is now 50+ free tools—royalty calculators, trademark scanners, policy checkers, and more. Everything runs in your browser. No signup, no data collection. Just tools that help you publish safely.
How It Works
Choose a Tool
Browse our 50+ free tools organized by category: Compliance, Metadata, Pricing, and more.
Enter Your Data
Input your book details. All processing happens in your browser—we never see or store your information.
Get Results Instantly
See your results immediately. Copy, download, or use them however you need. No account required.
Your Privacy Matters
What We DON'T Do
- ✕ Store your book titles or data
- ✕ Require account creation
- ✕ Sell your information
- ✕ Track your publishing activity
What We DO
- ✓ Process everything in your browser
- ✓ Use anonymous analytics only
- ✓ Keep all tools 100% free
- ✓ Update tools based on feedback
Most Used Tools
Questions or Suggestions?
I read every email and love hearing from fellow authors.