Step 1
Type a subreddit or a topic
A name like r/SaaS works. So do plain words like b2b marketing. You don't need an account.
Free Reddit checker
Subreddit finder: find subreddits for any niche
Type a subreddit or a topic and I'll show you up to 12 subreddits from our guides. Each row has the member count, the karma and account age to post, and whether self-promo is allowed.
Results come from Rankhog's published subreddit guides, not all of Reddit. Rules change, so read a room's newest posts before you write.
How it works
The question I get most is "where should I post?" So I built this. It only looks at subreddits we wrote a guide for, which means every number in the table is one we checked, with a full guide one click away.
Step 2
We match it to our guides
A subreddit gets the rooms closest to it. A topic gets the rooms whose names and tags fit best, plus the ones from our hand-picked lists.
Step 3
Open a guide before you post
Every row links to its guide. Read the rules there, then read the room's newest posts.
Example input and output
The live tool runs with your own context. This example shows the kind of practical answer you can expect.
Sample input
- Subreddit or topic
- indie hackers
Subreddits for indie hackers
Up to 12 rooms, best match first, each linked to its guide.
- r/indiehackers first, then rooms like r/SideProject, r/microsaas and r/Solopreneur
- Members, karma to post and account age for each
- Whether each room allows self-promotion
Use it with subreddit-specific context
Pair the tool with Rankhog's subreddit guides when you are posting somewhere strict. The guides cover rules, stats, what works, and removal risks.
Questions about Subreddit finder
How do I find subreddits for my niche?
Type your niche in plain words, like b2b marketing or indie hackers. The finder looks at every subreddit we have a guide for and puts the closest ones on top. Then open two or three guides and scroll the newest posts in each room. If questions like yours get real answers, that's your room.
What are subreddits similar to r/entrepreneur?
Type r/entrepreneur into the finder. It shows r/Entrepreneur first, then the rooms next to it: the same topic, plus the rooms our lists pair it with, like r/smallbusiness and r/startups. Any subreddit we have a guide for works the same way.
How do I know if a subreddit allows self-promotion?
Read its rules. Start with the sidebar, then the wiki if it has one. Or let the finder do it: the self-promo column says Allowed, Limited, Banned or Not listed, straight from each room's rules. Not listed means the rules say nothing. That is not the same as allowed, so go easy.
Where does the data come from?
Our own subreddit guides. We read each room's public page and rules about every 30 days and keep the date next to every number. The finder never reads Reddit live, so it's fast and it never guesses. If we don't have a guide for a subreddit yet, it tells you and shows the closest names we do have.
Is the subreddit finder free?
Yes. You get 20 free runs a day across our free tools, no account needed. Rankhog subscribers get unlimited runs, and Rankhog can watch these rooms for threads where your product fits.
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When a one-off check is not enough
Let Rankhog find the right Reddit threads and draft with subreddit context.
Use Rankhog when you know your rooms and want someone watching them for the threads your buyers start.