Top Free Science Fiction Kindle Books

Whether you enjoy futuristic, dystopian, apocalyptic, space opera, or other sci-fi delights, you’ll find great books among our top 100 free Kindle science fiction books.

Hers, Untamed

Free
Steamy Romance, Science Fiction
4.2★ 750+ ratings

Alyssa buys a fierce human-alien hybrid to be her sex pet – but what happens when he breaks out of the cage?

Amazon

Blackwing

Free
Science Fiction
4.2★ 200+ ratings

Follow Socrates Blackwing on a thrilling journey through the planes of reality as he battles ne’er-do-wells in the year 2070.

Amazon

Free
Science Fiction
4.3★ 1000+ ratings

Enter a world of suspense and danger in ‘Displaced,’ where Kevin Murdock’s awakening aboard a transport pod sparks a thrilling battle for survival.

Amazon

Author Tips for Success

APPEARANCE

A high-quality cover, an enticing description, and many positive ratings are among the most important elements in attracting readers' attention.
PRICING & DURATION

Free books perform better than discounted books; also grouping several promotion days together and promoting on multiple platforms maximizes the effectiveness of your promotions.
GENRES

The most popular genres among our readers are mystery, romance, and thriller, followed by fantasy and sci-fi, although some interest is shown in all genres.
TIMING & FREQUENCY

Mondays through Saturdays perform better than Sundays and holidays. To avoid oversaturation, we do not recommend promoting the same title more than once every few months on our site.

Top Free Science Fiction Kindle Books

Hers, Untamed

Blackwing

Displaced

APPEARANCE

PRICING & DURATION

GENRES

TIMING & FREQUENCY