KDP categories · Top KDP authors
Spectrum: Amazon KDP author data
Spectrum has 150 books on Amazon, 97 of them on a best-seller list in the last 30 days (best rank #1), mostly in Vocabulary & Spelling, Fractions, New, Used & Rental Textbooks.
150Books on Amazon
97Listed in 30 days
4.6Average rating
| Median price | $10.07 |
|---|---|
| Price range (middle 50%) | $9.74 – $13.52 |
| Median reviews | 840 |
| Total reviews | 208,798 |
| New books (30 days) | 4 |
| Breakout books (30 days) | 0 |
What stands out
- 65% of the catalog made a best-seller list in the last 30 days: the whole backlist sells, not one hit.
- 4 new books in the last 30 days.
Spectrum's best-ranked books
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Spectrum Grade 7 Science Workbook, Middle School Books Covering Natural, Earth, Life Sciences, and More With Scientific Research Activities, Classroom or Homeschool Curriculum (Volume 59)
by Spectrum
- Price$9.74
- Rating4.6
- Reviews2,687
-
Spectrum Spelling Workbook Grade 2, Ages 7 to 8, 2nd Grade Spelling Workbook, Phonics, Handwriting Practice with Sight Words, Vowels, and Compound Words With English Dictionary - 208 Pages
by Spectrum
- Price$8.13
- Rating4.7
- Reviews2,411
-
Spectrum 7th Grade Math Workbooks, Mathematics Middle School Books Covering Geometry, Algebra, Ratio, Integers, and More, Classroom or Homeschool Curriculum
by Spectrum
- Price$10
- Rating4.6
- Reviews5,966
-
Spectrum Grade 7 Reading Comprehension Workbook, Middle School Activity Book Covering Nonfiction and Fiction Passages, Story Structure, and more, Classroom or Homeschool Curriculum
by Spectrum
- Price$14.99
- Rating4.6
- Reviews3,261
-
Spectrum Reading 3rd Grade Workbooks, Activity Book Covering Nonfiction and Fiction Passages, Story Structure, Identifying Main and Key Ideas, and more, Classroom or Homeschool Curriculum
by Spectrum
- Price$13.97
- Rating4.7
- Reviews3,038
-
Spectrum Grade 8 Reading Comprehension Workbook, Middle School Activity Book Covering Nonfiction and Fiction Passages, Story Structure, and more, Classroom or Homeschool Curriculum
by Spectrum
- Price$10
- Rating4.6
- Reviews2,823
-
Spectrum Reading 2nd Grade Workbook, Activity Book Covering Nonfiction and Fiction Passages, Story Structure, Identifying Main and Key Ideas, and more, Classroom or Homeschool Curriculum
by Spectrum
- Price$10
- Rating4.7
- Reviews2,614
-
Spectrum | Writing Workbook | 8th Grade, 144pgs
by Spectrum
- Price$10
- Rating4.6
- Reviews1,743
-
Spectrum 7th Grade Writing Workbook, 192-Page Book, Middle School Writing Prompts Covering Informative, Argumentative, Comparative, and Fiction Story Writing Practice
by Spectrum
- Price$13.49
- Rating4.6
- Reviews1,585
-
Spectrum 4th Grade Math Workbooks, Mathematics Activity Book for Kids Ages 9-10, Geometry, Fractions, Decimals, Algebra Prep, Multiplication, Division, and More, Classroom and Homeschool Curriculum
by Spectrum
- Price$9.74
- Rating4.7
- Reviews5,729
Main categories
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.