# KDP Tools (kdptools.io)

KDP Tools is a web toolkit for KDP publishers with free royalty, KENP and spine calculators plus credit-based AI niche, keyword and category tools.

- Canonical page: https://kdp123.com/t/kdp-tools-io/
- Official site: https://kdptools.io
- Categories: Keywords & Categories, Book & Niche Research, AI Tools
- Price: Free tier, paid from $9.99/mo (Subscriptions from $9.99/month with 400 credits; credit packs from $2.99. Credits valid for 12 months. Many calculators are free without login.)
- Platforms: web
- Outputs KDP-ready files: Not stated
- Touches your KDP account: Not stated
- Amazon marketplaces: us
- Official Amazon product: No
- Last checked: 2026-11-09

## Summary

kdptools.io bundles dozens of free calculators (royalty, KENP, spine width, print cost, readability) with credit-based tools such as Niche Research, which reads current Amazon.com results for a keyword, a seven-backend-keyword generator, a category matcher and a book tracker for reviews and BSR. Many of its tools are AI-driven, so suggestions need checking and AI-generated content must be disclosed to KDP. The site is ad-supported, and its niche research covers Amazon.com only.

## Pros

- Free KDP calculators that need no account
- Low entry price for the credit-based research tools

## Cons

- Niche research reads Amazon.com only
- AI-generated scores and category matches are not Amazon data

## Alternatives

- [KDPEasy](https://kdp123.com/t/kdpeasy/)
- [Book Bolt](https://kdp123.com/t/book-bolt/)
- [Publisher Rocket](https://kdp123.com/t/publisher-rocket/)

## Sources

- https://kdptools.io/pricing
- https://kdptools.io/niche-research
- https://kdptools.io/