KDP categories · Top KDP authors
Kevin Marx: Amazon KDP author data
As of Nov 6, 2026, Kevin Marx has 25 books on Amazon, 25 of them on a best-seller list in the last 30 days (best rank #1), mostly in Japanese, Japan, Phrasebooks.
| Median price | $4.99 |
|---|---|
| Price range (middle 50%) | $2.99 – $9.98 |
| Median reviews | 34 |
| Total reviews | 5,531 |
| New books (30 days) | 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.
Kevin Marx's best-ranked books
-
Speak Japanese in 90 Days: A Self Study Guide to Becoming Fluent
by Kevin Marx
- Price$4.99
- Rating4.5
- Reviews1,025
- Published2015-08
-
Speak German in 90 Days: A Self Study Guide to Becoming Fluent
by Kevin Marx
- Price$4.99
- Rating4.4
- Reviews821
-
Sally and the Microscope サリーとけんびきょう: Children's Bilingual Picture Book: English, Japanese (Children's Bilingual Japanese & English)
by Kevin Marx
- Price$0.99
- Rating4.5
- Reviews7
-
Japanese Readings 1000: Master 1000 Words with 20 Short Stories (Speak Japanese in 90 Days Book 3)
by Kevin Marx
- Price$4.99
- Rating4.6
- Reviews143
-
German Study Guide: A Visual Reference for Beginning German Grammar (Speak German in 90 Days Book 3)
by Kevin Marx
- Price$2.99
- Rating4.3
- Reviews34
-
Habla japonés en 90 días: Una guía de autoestudio para hablar con fluidez (Spanish Edition)
by Kevin Marx
- Price$4.99
- Rating4.5
- Reviews229
-
German Short Stories 1000: Master 1000 Words with 20 Short Stories (Speak German in 90 Days Book 2)
by Kevin Marx
- Price$4.99
- Rating4.2
- Reviews29
-
Speak Japanese in 90 Days: A Self Study Guide to Becoming Fluent
by Kevin Marx
- Price$4.99
- Rating4.5
- Reviews165
-
Japanese Study Guide: A Visual Reference for Beginning Japanese Grammar (Speak Japanese in 90 Days Book 5)
by Kevin Marx
- Price$2.99
- Rating4.2
- Reviews56
-
Speak Japanese in 90 Days: A Self Study Guide to Becoming Fluent
by Kevin Marx
- Price$15.80
- Rating4.5
- Reviews1,025
Main categories
FAQ
How many books does Kevin Marx have on Amazon?
KDPTop tracks 25 of their books; 25 made an Amazon list in the last 30 days.
Which categories does Kevin Marx publish in?
Their books chart most often in Japanese, Japan, Phrasebooks.
How does Kevin Marx price their books?
The median price is $4.99; half of the books cost $2.99–$9.98.
Has Kevin Marx 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.