KDP categories · Top KDP authors
Sam Key: Amazon KDP author data
As of Nov 6, 2026, Sam Key has 12 books on Amazon, 12 of them on a best-seller list in the last 30 days (best rank #4), mostly in XML, Prolog, Ada.
| Median price | $3.05 |
|---|---|
| Price range (middle 50%) | $1.92 – $4.04 |
| Median reviews | 20 |
| Total reviews | 278 |
| New listings (30 days, incl. new editions) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 100% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $3.05, 83% below the median of their main category, XML.
Sam Key's best-ranked books
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Prolog Programming; Success in a Day: Beginners Guide to Fast, Easy and Efficient Learning of Prolog Programming (Prolog, Prolog Programming, Prolog Logic, ... Programming, Programming Code, Java)
by Sam Key
- Price$2.99
- Rating2.8
- Reviews21
-
XML Programming Success in a Day: Beginner’s Guide to Fast, Easy, and Efficient Learning of XML Programming (XML, XML Programming, Programming, XML Guide, ... XSL, DTD's, Schemas, HTML5, JavaScript)
by Sam Key
- Price$3.11
- Rating3.0
- Reviews73
-
Prolog Programming Success in a Day: Beginner's Guide to Fast, Easy, and Efficient Learning of Prolog Programming
by Sam Key
- Price$1.73
- Reviews-
-
Windows 8 Tips For Beginners
by Sam Key
- Price$32.83
- Rating4.0
- Reviews20
-
Microsoft Excel: The Simplest and Quickest Guide to Operating Excel's Complex System!
by Sam Key
- Price$4.04
- Rating3.6
- Reviews9
-
DOS: Programming Success in a Day: Beginners guide to fast, easy and efficient learning of DOS programming (DOS, ADA, Programming, DOS Programming, ADA ... LINUX, RPG, ADA Programming, Android, JAVA)
by Sam Key
- Price$2.99
- Rating3.5
- Reviews19
-
Rails Programming Professional Made Easy, 2nd Edition: Expert Rails Programming Success in a Day for Any Computer User!
by Sam Key
- Price$4.04
- Rating2.8
- Reviews7
-
Fortran Programming Success in a Day: Beginners Guide to Fast, Easy and Efficient Learning of Fortran Programming
by Sam Key
- Price$4.04
- Rating3.1
- Reviews21
-
Python Programming in a Day & Ruby Programming Professional Made Easy
by Sam Key
- Price$1.74
- Reviews-
-
ADA: Programming Success in a Day: Beginners Guide to Fast, Easy, and Efficient Learning of ADA Programming
by Sam Key
- Price$4.04
- Rating2.6
- Reviews20
Main categories
FAQ
How many books does Sam Key have on Amazon?
KDPTop tracks 12 of their books; 12 made an Amazon list in the last 30 days.
Which categories does Sam Key publish in?
Their books chart most often in XML, Prolog, Ada.
How does Sam Key price their books?
The median price is $3.05; half of the books cost $1.92–$4.04.
Has Sam Key released new books recently?
0 new books in the last 30 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.