About r/KerbalSpaceProgram
In its own words:
The Kerbal Space Program subreddit. For all your gaming related, space exploration needs. https://kerbalspaceprogram.com
Community guide
r/KerbalSpaceProgram (#697, about 1.5 million subscribers) is oriented around: The Kerbal Space Program subreddit. For all your gaming related, space exploration needs. https://kerbalspaceprogram.com Recent activity samples show 40 posts/day in recent samples (~29% gallery, ~29% image, ~24% text). Public rules we collected include: Please remain kind and civil at all times; No posts unrelated to KSP; No real life disasters that resulted in fatality; Piracy is not allowed; Low-effort content will be removed. Directory metadata files it under “Games”.
What belongs here
Stay inside the room’s stated scope rather than adjacent off-topic dumps. Spoiler tags matter for fresh releases, endings, or results. Piracy and illegal distribution talk is removed. Low-effort or empty shitposts are often removed—add context that fits the purpose.
How it differs from lookalikes
Prefer this room when your post matches its description and rules—not merely a larger sibling community. The public rule list is long enough that skimming all entries once beats assuming defaults from similar subs.
Practical pointers
Read the live sidebar/rules before posting; collected snapshots can lag. Err on spoiler tags. Common flairs in samples include: KSP 1 Image/Video, KSP 1 Question/Problem, KSP 1 Mods, KSP 1 Suggestion/Discussion.
SubMouse Editorial
The community was created on Jul 11, 2011, which makes it 15 years old. Since Oct 26, 2026, it has gained 339 subscribers (+0.02%). Among the 20 communities on our science list it is number 7 by size. It sits just behind r/warriors (#696) and ahead of r/ifyoulikeblank (#698) in our ranking.
What sets r/KerbalSpaceProgram apart
Its rhythm is strongly tied to time zones: the busiest hour (17:00 UTC) sees about 6.7× as many posts as the quietest (07:00 UTC).
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/KerbalSpaceProgram climbed from 1,528,110 to 1,530,310 subscribers (+2.2K, +0.14%). That is about 50 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/KerbalSpaceProgram talks about
We read the titles of 241 recent posts (Oct 29–Nov 5), the words that come up most are “ksp”, “help”, “mun”, “station” and “space”. Other frequent themes are mission, orbit, rocket, kerbal, landing and crew. Recurring phrases include “space station”, “near future”, “minor planets” and “outer planets”. By format, 29% are galleries, 29% are images and 24% are text posts.
Popular post flairs: KSP 1 Image/Video (135), KSP 1 Question/Problem (56), KSP 1 Mods (25), KSP 1 Suggestion/Discussion (16), KSP 1 Meta (4), KSP 2 Image/Video (2).
Activity and best time to post
r/KerbalSpaceProgram gets about 40 new posts a day. The public archive holds 435,437 posts and 4,639,366 comments in total, about 10.7 comments per post. Last week the busiest day was Saturday (43 posts) and the quietest was Wednesday (23). Posting peaks around 17:00 UTC and is lowest around 07:00 UTC.
Rules of r/KerbalSpaceProgram
The moderators of r/KerbalSpaceProgram list 7 rules. In short:
- Please remain kind and civil at all times
- No posts unrelated to KSP
- No real life disasters that resulted in fatality
- Piracy is not allowed
- Low-effort content will be removed
- Leave moderation to the moderators
- Tag spoilers/Easter eggs as spoilers
How to join
Open reddit.com/r/KerbalSpaceProgram and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many subscribers does r/KerbalSpaceProgram have?
r/KerbalSpaceProgram has 1,530,310 subscribers (Nov 2, 2026), which makes it the #697 safe-for-work subreddit in the SubMouse ranking. It added 2,200 members between Sep 19, 2026 and Nov 2, 2026.
When was r/KerbalSpaceProgram created?
r/KerbalSpaceProgram was created on Jul 11, 2011, so it has been around for 15 years.
Is r/KerbalSpaceProgram still active?
Yes. r/KerbalSpaceProgram gets about 40 new posts a day (average of the last four weeks). Over its lifetime the archive counts 435,437 posts and 4,639,366 comments. In a sample of 241 recent posts we counted 173 different authors.
What is the best time to post in r/KerbalSpaceProgram?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Saturday and the quietest Wednesday, and most posts arrive around 17:00 UTC, with the fewest around 07:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What kind of posts are on r/KerbalSpaceProgram?
The community describes itself as: “The Kerbal Space Program subreddit. For all your gaming related, space exploration needs. https://kerbalspaceprogram.com” Recent post titles often mention ksp, help, mun, station and space. Most posts are galleries (29%).
Is r/KerbalSpaceProgram SFW?
Yes. Reddit does not mark r/KerbalSpaceProgram as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
What are the rules of r/KerbalSpaceProgram?
Join the community on Reddit first, then use “Create post”. r/KerbalSpaceProgram accepts both text and link posts, with images, videos, galleries and polls enabled. It has 7 posted rules, starting with: “Please remain kind and civil at all times”; “No posts unrelated to KSP”; “No real life disasters that resulted in fatality”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
What subreddits are similar to r/KerbalSpaceProgram?
Communities with similar topics include r/space (28M), r/Costco (1.6M), r/rap (2.6M), r/SipsTea (4.1M) and r/datascience (2.8M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/KerbalSpaceProgram.