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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. Founded 2008 · 4.5M members

4.5M members. The best post we have captured here reached 36.4K upvotes, which works out to 8 per 1,000 members.

8peak upvotes per 1,000 members
4.5Mmembers
36.4Kbest post
7.8Kmost comments
400posts we track

Open r/scifi on Reddit ↗

What actually lands here

The mix of post types among everything we have captured. Posting a link where almost nothing but images lands is wasted effort, and this is the fastest way to see it.

36% 29% 15% 10% 8%
Text 36% Image 29% Question 15% Gallery 10% Link 8% Video 3%

The topics it labels

Flairs are the community's own categories, and the closest thing a subreddit has to telling you what it wants.

Recommendations 83 Original Content 73 General 57 Print 35 Films 23 TV 14 ID This 12 Art 4 Games 3 Community 2

What the ceiling looks like

The biggest posts we have captured here. Links go to the original on Reddit.

Insane film 🍿

↑ 36.4K 💬 1.3K image 2025

Who in a sci-fi movie wasn’t the lead, but stole every scene they were in?

↑ 34K 💬 2.3K image 2025

Join the Battle for Net Neutrality! Don't let the FCC destroy the internet!

↑ 33.9K 💬 122 link 2017

Maybe we'll get there...maybe...🤔

↑ 30K 💬 465 image 2024

I’d trade every Transformers movie (yes, even Bumblebee 😭) for just ONE District 9 sequel

↑ 25.8K 💬 931 image 2025

This week I bought a new iPad for my Sci fi drawings

↑ 21.4K 💬 527 gallery 2026

What’s the most epic and grand battle/war to ever occur in science fiction?

↑ 19.5K 💬 4.3K image 2025

Making my first ever graphic novel

↑ 18.9K 💬 627 gallery 2026

Sharing some of my Sci-fi inspired artwork from August

↑ 17.9K 💬 495 gallery 2026

Which sci-fi film do you consider a 10/10 - no skips, no weak moments, just pure perfection?

↑ 17K 💬 7.8K image 2025

Communities its size

Within four times the member count either way, so the comparison is fair. Sorted by upside.

r/scifi, in numbers

Answered from the posts ViralHunt holds from this community, not from Reddit's own about page.

What is r/scifi?
r/scifi describes itself this way: 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. It was founded in 2008 and has 4.5M members.
How many members does r/scifi have?
r/scifi has about 4.5M members. ViralHunt has tracked 400 of its posts; the biggest reached 36.4K upvotes, which is 8 per 1,000 members.
What is the most viral post on r/scifi?
"Insane film 🍿" reached 36.4K upvotes and 1.3K comments in 2025, the highest score among the posts we hold from r/scifi.
What subreddits are similar to r/scifi?
Communities of a comparable size we track: r/LeopardsAteMyFace, r/awfuleverything, r/interesting, r/im14andthisisdeep, r/JustGuysBeingDudes, r/freefolk.
What kind of posts do best on r/scifi?
Of the posts we hold, 36% are text posts and 29% are image posts.
When is the best time to post on r/scifi?
Across 400 timestamped posts we hold, the slots whose posts averaged the highest score are Wednesday at 07:00 UTC (15.1K avg upvotes), Tuesday at 11:00 UTC (11K avg upvotes), Sunday at 22:00 UTC (7.4K avg upvotes). The busiest day is Saturday. For Reddit as a whole, see the best time to post on Reddit page.
How many upvotes does a post need to reach the top of r/scifi?
The 20th-best post we hold from r/scifi has 11.8K upvotes, so that is roughly the bar for the top twenty. We captured 15 posts from it in the last 30 days.

See what is climbing here before you write

ViralHunt tracks Reddit and eight other networks, records how every post grows, and puts what is taking off in front of your team in one list.

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Every figure here is what ViralHunt has captured from r/scifi, not everything the community has ever posted. We deliberately do not publish an average score: our sample is weighted toward a community's best posts, so an average would be flattering and wrong. Peak per 1,000 members is computed the same way for every community listed. See how we measure.