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Julian Lornfeld: Amazon KDP author data
As of Nov 6, 2026, Julian Lornfeld has 23 books on Amazon, 18 of them on a best-seller list in the last 30 days (best rank #1), mostly in Introductory & Beginning, Ruby, Open Source.
| Median price | $24.94 |
|---|---|
| Price range (middle 50%) | $9.99 – $24.99 |
| Median reviews | 2 |
| Total reviews | 58 |
| New listings (30 days, incl. new editions) | 0 |
| Breakout books (30 days) | 0 |
What stands out
- 78% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- Median price $24.94, 20% above the median of their main category, Introductory & Beginning.
Julian Lornfeld's best-ranked books
-
Ruby Programming: A Complete Guide to Mastering Basics And Advanced Concepts With Ease
by Julian Lornfeld
- Price$9.99
- Rating5.0
- Reviews2
-
Swift Programming: A Detailed Guide to Learning Essential Concepts and Mastering Advanced Techniques
by Julian Lornfeld
- Price$9.99
- Rating4.3
- Reviews5
-
Swift Programming: A Detailed Guide to Learning Essential Concepts and Mastering Complex Techniques
by Julian Lornfeld
- Price$24.94
- Rating4.3
- Reviews5
- Published2025-03
-
Lua Programming: The Ultimate Learning Resource for Beginners and Advanced Mastery
by Julian Lornfeld
- Price$9.92
- Rating4.8
- Reviews6
-
Rust Programming: A Comprehensive Learning Path from the Basics to Cutting-Edge Techniques
by Julian Lornfeld
- Price$9.95
- Rating4.7
- Reviews5
- Published2025-04
-
Linux Programming: The Definitive Handbook of Linux Programming Techniques for Developers and Engineers
by Julian Lornfeld
- Price$29.99
- Rating5.0
- Reviews2
-
Perl Programming: A Complete Learning Guide Covering Basic and Advanced Topics
by Julian Lornfeld
- Price$9.92
- Rating1.0
- Reviews1
-
Perl Programming: A Complete Learning Journey Covering Basic and Advanced Topics
by Julian Lornfeld
- Price$19.91
- Rating1.0
- Reviews1
-
Linux Command Line: Learn to Control Your Linux System with Confidence from the Command Line
by Julian Lornfeld
- Price$19.99
- Rating5.0
- Reviews1
-
Learn PHP Through Projects: Create 10 Dynamic Web Applications to Master PHP Programming
by Julian Lornfeld
- Price$29.99
- Rating5.0
- Reviews3
Main categories
FAQ
How many books does Julian Lornfeld have on Amazon?
KDPTop tracks 23 of their books; 18 made an Amazon list in the last 30 days.
Which categories does Julian Lornfeld publish in?
Their books chart most often in Introductory & Beginning, Ruby, Open Source.
How does Julian Lornfeld price their books?
The median price is $24.94; half of the books cost $9.99–$24.99.
Has Julian Lornfeld 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.