r/SciFiConcepts is a subreddit with 28k members. The most common kinds of discussions are ideas and advice requests, and the community frequently discusses space, sci fi, technology, ai, and intelligence.
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 Themes in r/SciFiConcepts
#1
Ideas
: "What could be an alternative to guns in the very distant future?"
13 posts
#2
Advice Requests
: "I’m 13 and created a sci-fi story where invisible beings called “The Mark” manipulate human memory. Would love feedback!"
3 posts
#3
Solution Requests
: "Free, Open Source Atmospheric Purification Tower that Turns Any Waste Into Clean Air. No Patents, Looking to Put Something Good Out in This World if it's Feasible"
1 post
Popular Topics in r/SciFiConcepts
#1
Space
: "If you had an extremely advanced Spacecraft capable of safe, instantaneous travel to literally anywhere in Space, where would you go, and which planets or star systems would you visit? Would you ever return to Earth, or would you choose to live in Space indefinitely?"
31 posts
#2
Sci Fi
: "Imagine the Nystal: A telepathic device for your Sci Fi world"
22 posts
#3
Technology
: "They gave us Technology and we gave them our planet."
18 posts
#4
Ai
: "What if an Ai wasn’t programmed, but rAised like a child? That’s the world I’m building."
15 posts
#5
Intelligence
: "If an average person slept and woke up with genius-level Intelligence (like Limitless or Rick Sanchez), how quickly would they notice? What would they first perceive, and how would they test if they’ve really become that smart?"
12 posts
#6
Future
: "If you had an extremely advanced spacecraft capable of safe, instantaneous travel to literally anywhere in space, where would you go, and which planets or star systems would you visit? Would you ever return to Earth, or would you choose to live in space indefinitely?"
11 posts
#7
Aliens
: "Would Aliens think the same as us"
9 posts
#8
Consciousness
: "Theory: A journey into the past by Consciousness projection, based on fossil light from Earth"
9 posts
#9
Weapons
: "Expanding Universe and the Possible Consequences for Interstellar Travel"
8 posts
#10
Ftl
: "The Palimpsest Cosmos"
7 posts
Flair Used in r/SciFiConcepts
#1
Concept
: "The scariest generation ship scenario to me isn't the monster. It's the drift."
79 posts
#2
Question
: "What could be an alternative to guns in the very distant future?"
57 posts
#3
Worldbuilding
: "How do you knock out someone who is wearing a spacesuit in vacuum - without killing them?"
34 posts
#4
Story Idea
: "Weaponized linguistics"
29 posts
#5
Meta
: ""Fiction is the black market of philosophy""
1 post
Member Growth in r/SciFiConcepts
Yearly
+6k members(26.6%)
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Last updated: June 13, 2026