r/scifi↗
Welcome to r/scifi, a home for all things science fiction, the heart of speculative fiction. Join the discussion about your favorite books, authors, movies, shows, comics, and games — anything with a touch of science and imagination.
4.5M subscribers717 posts / mo in Sep 2026541 authors / mosince 2008
r/scifi has 4.5M members (+1.8% over the last 12 months). It gets about 717 posts a month from 541 people. Top topics: Sci-Fi Books, Space Sci-Fi Books and Sci-Fi Horror Aliens.
When to post on r/scifi
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How r/scifi has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/scifi
Top topics
Share of the subreddit's posts
- Sci-Fi Books1.8%
- Space Sci-Fi Books1.1%
- Sci-Fi Horror Aliens0.8%
- Free Sci-Fi Novels0.7%
- Space Opera Novels0.7%
Brands people mention
Most-mentioned brands and sites, last 12 months
- Goodreads
- IMDb
- Substack
- Royal Road
- xkcd
Everything else about r/scifi
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research