KDP categories · Top KDP authors
Ruby (Programming Languages, Books): Amazon KDP category data
Amazon Books Best Sellers data for Ruby (Programming Languages, Books), updated Nov 2, 2026: median price $27.47, median 23 reviews, average rating 4.5 and a KDPTop opportunity score of 29/100 (highly competitive).
| Price range (middle 50%) | $18.99 – $44.99 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 6% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 8% of the parent category Programming Languages (297), one of the easier corners under it.
- At $27.47 its median price beats 87% of Books categories, leaving more margin per copy.
- Its review barrier is lower than in 71% of Books categories: the median best seller has only 23 reviews, so new books can chart with few.
Top 10 Ruby best sellers
-
Metasploit, 2nd Edition
by David Kennedy
- List rank#1
- Price$35.99
- Rating4.8
- Reviews59
-
Rust in Action
by Tim McNamara
- List rank#2
- Price$17.36
- Rating4.7
- Reviews127
-
Programming Ruby 4: The Pragmatic Programmer's Guide
by Noel Rappin
- List rank#3
- Price$75.95
- Reviews-
-
97 Things Every Programmer Should Know: Collective Wisdom from the Experts
by Kevlin Henney
- List rank#4
- Price$15.55
- Rating4.1
- Reviews233
-
Programming Crystal: Create High-Performance, Safe, Concurrent Apps
by Ivo Balbaert
- List rank#5
- Price$24.80
- Rating4.3
- Reviews12
-
Machine Learning for Factor Investing: R Version: R Version (Chapman and Hall/CRC Financial Mathematics Series)
by Guillaume Coqueret
- List rank#6
- Price$46.37
- Rating4.1
- Reviews18
-
Rails Scales!: Practical Techniques for Performance and Growth
by Cristian Planas
- List rank#7
- Price$39.58
- Rating5.0
- Reviews1
-
Polished Ruby Programming: Build better software with more intuitive, maintainable, scalable, and high-performance Ruby code
by Jeremy Evans
- List rank#8
- Price$32.47
- Rating4.6
- Reviews75
-
Practical Object-Oriented Design: An Agile Primer Using Ruby
by Sandi Metz
- List rank#9
- Price$42.77
- Rating4.8
- Reviews229
-
The Well Grounded Rubyist
by David A. Black
- List rank#10
- Price$25.96
- Rating4.6
- Reviews99
FAQ
Is Ruby a good niche for Amazon KDP?
Its KDPTop opportunity score is 29/100, which makes it highly competitive. The median best seller has 23 reviews and sells for $27.47.
How many reviews do you need to rank in Ruby?
The median best seller has 23 reviews, and 89% of them have fewer than 100.
What do Ruby best sellers cost?
The median price is $27.47; half of the best sellers are priced between $18.99 and $44.99.
Can new books break into Ruby?
6% of the current best sellers were released in the last 90 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.