r/SciFiConcepts is a subreddit with 31k members. The community frequently discusses space, sci fi, technology, ai, and intelligence, and the most common flair used is concept, question, worldbuilding, story idea, and meta.
scifi ideas and concepts. These science fiction concepts can be based in hard sci-fi or can come from science fantasy. The only thing that matters is that the concepts could be reasonably found in a SF book, film or short story. If you have too many ideas to write about or are just looking for discussion then this is the right sub for you. Post your scifi concepts, ideas, plots and worldbuilding
Popular Topics in r/SciFiConcepts
#1
Space
31 posts
#2
Sci Fi
22 posts
#3
Technology
18 posts
#4
Ai
15 posts
#5
Intelligence
12 posts
#6
Future
11 posts
#7
Aliens
9 posts
#8
Consciousness
9 posts
#9
Weapons
8 posts
#10
Ftl
7 posts
Flair Used in r/SciFiConcepts
#1
Concept
: "I'm getting on in years and I wondered if Sci-Fiction has, in any way, effected your life. 😊"
45 posts
#2
Question
: "How much should people in a post apocalyptic sci fi world actually understand old technology?"
17 posts
#3
Worldbuilding
: "Dimensional Engines"
15 posts
#4
Story Idea
: "I fell asleep…"
11 posts
#5
Meta
: "[meta]Can we please have a rule against AI-generated content?"
6 posts
Member Growth in r/SciFiConcepts
Yearly
+7k members(27.5%)
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Last updated: October 2, 2026