r/SciFiConcepts is a subreddit with 30k members. The community frequently discusses space, sci fi, technology, ai, and intelligence, and the most common flair used is concept, story idea, question, worldbuilding, 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
: "The scariest generation ship scenario to me isn't the monster. It's the drift."
73 posts
#2
Story Idea
: "Dragons Were Never Magical. They Were Refugees."
41 posts
#3
Question
: "“Biosphere civilizations” are always portrayed as weak"
34 posts
#4
Worldbuilding
: "Can anyone help me figure out how the discovery of a new type of matter that seemingly breaks the laws of physics would change the world of engineering?"
32 posts
#5
Meta
: "Petition to ban LLM slop on this sub."
5 posts
Member Growth in r/SciFiConcepts
Yearly
+6k members(27.5%)
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Last updated: August 15, 2026