Similar subreddits: find communities like one you already know
Once you've found one subreddit where your buyers hang out, the next ones are where the same people also post. Enter a subreddit and we read the recent comments of this month's top posters there, rank the other subreddits they're active in, and add topic matches from Reddit's community search.
Similar subreddits are communities that share people, not just a topic. A subreddit about SaaS and one about side projects can share far more active members than two subreddits with "SaaS" in the name.
How it finds subreddits like yours
| Step | What we do | Why |
|---|---|---|
| 1 | Read the top posts of the past month in your subreddit | The authors of those posts are its most engaged members |
| 2 | Read the recent comments of up to 12 of those authors | Shows where else these people spend time |
| 3 | Count how many of them are active in each other subreddit | Two or more shared authors counts as overlap |
| 4 | Add communities from Reddit's own search for the subreddit's name and title | Catches topic neighbours the sample missed |
Overlap matches come first, ranked by how many top posters they share. Topic matches come after, in the order Reddit's search ranks them. NSFW communities are left out.
How to read the overlap
"3 shared top posters (25%)" means 3 of the 12 people we read are also active there. That's a small sample, so read it as a strong hint, not a census. Overlap with huge general subreddits (r/AskReddit and the like) is common and tells you little. Overlap with a specific, mid-sized community is the signal to act on.
Related tools
- Check timing in each new community with best time to post.
- Read the rules before you post with the post rule checker.
- Browse our subreddit profiles for rules and brand policy.
Limits
- It samples a handful of top posters, so niche subreddits with few active people give thin results.
- Results are cached for a week, so running it again on the same subreddit returns the same list.
- Each run reads many accounts, which is why the tool has a daily limit.
What to do next
- Check each candidate's size and activity with subreddit stats.
- Describe your product instead of naming a subreddit with the subreddit finder.
- See curated lists for your market, like the best subreddits for SaaS founders.
Frequently asked questions
How do I find subreddits like one I already use?
Enter it above. The tool shows subreddits whose top posters overlap with yours, then topic matches.
What is subreddit user overlap?
It's the share of one subreddit's active members who are also active in another. High overlap means the same people read both.
Why is a big general subreddit in my results?
Active Redditors often post in the biggest communities too. Skip those and look at the specific ones.
Can I discover subreddits without knowing one first?
Yes. Use the [subreddit finder](/tools/best-subreddit-finder) and describe what you sell.
Want the shortlist built around your buyers?
We map the subreddits a product's buyers actually use, then post and reply inside each one's rules, for funded SaaS, fintech and DTC brands. Book a call to see if it's a fit.
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