KDP categories · Top KDP authors
River9 Studio: Amazon KDP author data
As of Nov 6, 2026, River9 Studio has 24 books on Amazon, 23 of them on a best-seller list in the last 30 days (best rank #10), mostly in Reference, Comics & Manga, Painting.
| Median price | $7.90 |
|---|---|
| Price range (middle 50%) | $7.90 – $8.50 |
| Median reviews | 9 |
| Total reviews | 328 |
| New books (30 days) | 1 |
| Breakout books (30 days) | 0 |
What stands out
- 96% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $7.90, 21% below the median of their main category, Reference.
River9 Studio's best-ranked books
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Creepy Cutie Pastel Goth Coloring Book: Cute and Spooky Pastel Goth Simple Pages for Teens and Adults (Pastel Goth Coloring Series)
by River9 Studio
- Price$8.90
- Rating4.7
- Reviews8
-
Dark Gardens: Horror Coloring Book for Adults, Creepy & Macabre Flowers and Plants for Relaxation & Stress Relief (Creepy Nature)
by River9 Studio
- Price$7.90
- Reviews-
-
Dark Beauty Gothic Grayscale Coloring Book for Adults: A Haunting Collection of Mysterious and Macabre Gothic Women for Stress Relief and Relaxation (Beauty of Horror)
by River9 Studio
- Price$8.29
- Rating5.0
- Reviews4
-
Haunted Dolls Coloring Book: Creepy and Spooky Illustrations of Weird Dolls, for Adults and Teens - Perfect Gift for Stress Relief (Creepy Dolls)
by River9 Studio
- Price$7.90
- Rating5.0
- Reviews3
-
Dark Beauty Witch Grayscale Coloring Book for Adults: Hauntingly Beautiful and Sinister Witch Designs to Color for Stress Relief and Relaxation (Beauty of Horror)
by River9 Studio
- Price$8.29
- Rating3.8
- Reviews12
-
Gore: Horror Coloring Book For Adults | A Terrifying Collection of Dark, Scary and Bone-Chilling Illustrations for Relaxation & Stress Relief (Creepy Horror)
by River9 Studio
- Price$7.90
- Rating4.2
- Reviews10
-
Creepy Horror Coloring Book for Adults: A Terrifying Collection of Scary, Gory, Abnormality Dark Fantasy for Adults and Teens Mindfulness and Relaxation
by River9 Studio
- Price$8.69
- Rating4.4
- Reviews127
-
Disturbing Coloring Book for Adults: Gory, Creepy, Macabre, Spine-Chilling Illustrations - A Gorgeous Gift for Relaxation and Stress Relief (Creepy Horror)
by River9 Studio
- Price$8.50
- Rating4.3
- Reviews9
-
The Horror Coloring Book for Adults: Spine-Chilling Collection of Creepy, Gory, Scary Illustrations for Adults - Gorgeous Gift for Relaxation and Stress Relief (Creepy Horror)
by River9 Studio
- Price$8.50
- Rating4.8
- Reviews11
-
Creepy Nightmare: Horror Coloring Book for Adults | A Terrifying Collection of Dark, Scary, and Spine-Chilling Illustrations, Great Gift for Relaxation and Stress Relief (Dark Anime Girls)
by River9 Studio
- Price$7.90
- Rating5.0
- Reviews11
Main categories
FAQ
How many books does River9 Studio have on Amazon?
KDPTop tracks 24 of their books; 23 made an Amazon list in the last 30 days.
Which categories does River9 Studio publish in?
Their books chart most often in Reference, Comics & Manga, Painting.
How does River9 Studio price their books?
The median price is $7.90; half of the books cost $7.90–$8.50.
Has River9 Studio released new books recently?
1 new book 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.