161 posts analyzed Updated Sep 2026
Averages 5 posts/day, top 50% activity. Most active Wednesdays around 10 AM UTC. Mostly text posts.
r/HardSciFi Traffic & Engagement r/HardSciFi Traffic & Engagement
Volume and engagement over time Posting volume and engagement over time
Post Format
Upvote Distribution
How upvoted posts perform Only posts with 2+ upvotes. The bands below show how those posts are spread by upvote count.
r/HardSciFi Most Active Times When r/HardSciFi Is Most Active
Peak posting by day and hour (UTC) When this community posts most, by day and hour (UTC)
Most Active by Day
r/HardSciFi Flair Performance r/HardSciFi Flair Performance
Upvotes and volume by flair Average upvotes and post volume by flair
| Flair | Posts | Upvotes |
|---|---|---|
| Discussion | 62 (38.5%) | 14 |
| Self Promotion | 61 (37.9%) | 10 |
| Recommendations | 34 (21.1%) | 4 |
| Meta | 4 (2.5%) | 42 |
Post Type Breakdown
Share by text, image, or link Share of posts by format: text, image, or link
r/HardSciFi Trending Keywords Trending Keywords in r/HardSciFi
Ranked by how often they appear Title keywords ranked by how often they appear
| Keyword | Mentions ▼ | Upvotes | Comments |
|---|---|---|---|
| sci | 30 (18.6%) | 16 | 18 |
| hard | 26 (16.1%) | 9 | 12 |
| story | 10 (6.2%) | 3 | 7 |
r/HardSciFi Mentioned Domains Mentioned Domains in r/HardSciFi
Most linked sites Most linked sites in this subreddit
This community doesn't link off-site.
Its posts are text, images, or discussion rather than outbound links.
r/HardSciFi Top Posts Top Performing Posts in r/HardSciFi
Highest-performing posts Highest-performing posts. Each title links to Reddit.
What’s your favorite spaceship weapon and why?
Sci-Fi has become real once more
The Spears of Abael: Some of the big warships I was working on.
What is the single worst design flaw in sci-fi spaceship history?
A small fleet battle in my orbital mechanics RTS
Where’s the character driven hard sci fi?
Nezango-Class Corvette/Missile Boat | Necessity is the mother of invention
ROM-12 Scout Tilt-Rotor
Lunar EVA suit designs for my Alternate History Project
Light delay changes the way wars are fought on Mars (new novel)
| Title | Upvotes | Comments | Type | Date |
|---|---|---|---|---|
| What’s your favorite spaceship weapon and why? | 190 | 114 | image | Sep 16 |
| Sci-Fi has become real once more | 164 | 94 | image | Sep 7 |
| The Spears of Abael: Some of the big warships I was working on. | 129 | 18 | image | Sep 9 |
| What is the single worst design flaw in sci-fi spaceship history? | 87 | 125 | image | Sep 3 |
| A small fleet battle in my orbital mechanics RTS | 82 | 10 | image | Sep 5 |
| Where’s the character driven hard sci fi? | 81 | 27 | image | Sep 6 |
| Nezango-Class Corvette/Missile Boat | Necessity is the mother of invention | 74 | 9 | image | Sep 26 |
| ROM-12 Scout Tilt-Rotor | 71 | 9 | image | Sep 12 |
| Lunar EVA suit designs for my Alternate History Project | 66 | 16 | image | Sep 18 |
| Light delay changes the way wars are fought on Mars (new novel) | 59 | 7 | image | Sep 10 |
r/HardSciFi Audience Overlap r/HardSciFi Subreddit Overlap & Related Communities
Overlapping audiences Communities with overlapping audiences
r/HardSciFi FAQ Frequently Asked Questions About r/HardSciFi
What's the best time to post on r/HardSciFi?
Based on posting volume, r/HardSciFi is most active on Wednesdays around 10 AM UTC. That window has the most community activity, but busier hours also mean more competition for attention.
How active is r/HardSciFi?
r/HardSciFi averages 5 posts per day and ranks in the top 50% for activity among tracked SFW subreddits.
How many upvotes do posts on r/HardSciFi get?
Posts on r/HardSciFi average about 11 upvotes this month (net score per post).
What kind of posts does r/HardSciFi get most?
On r/HardSciFi, posts are a mix of formats, mostly text posts