KDPTop

Judgement

What it is

Complete system

What it does

Tracks Amazon's book and Kindle best-seller lists in every category each day, with sales estimates, keyword search volume and author data, to help self-publishers choose what to write.

Adopt it when

You publish through Amazon KDP and want category research beyond what Publisher Rocket or Book Beam give you.

Watch out

Sales figures are estimates worked out from best-seller ranks, not Amazon's own numbers.

Ready for

Usable

Runs as

Cloud service

What the license allows

Closed source: you use it under the maker's terms and cannot change or resell the code.

Judged on 2026-11-08 from the maker's description and Wikipedia. The license and age lines are worked out directly.

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Under it

Every program, KDPTop included, runs on a microchip.

How compilers were built, back to punched paper tape