3.8kupvotes
Top post by u/Crafty-Panic331
Search any topic and get the subreddits worth posting in, the communities they overlap with, what actually gets upvoted there, and the most active voices in each.
Discovery
Search a topic in plain keywords and get every community that matches, plus the ones your audience overlaps into — each with its real size and activity, and the posting rules that decide whether your post survives.
Overlap graph
Communities are connected by the people who post in both. The overlap graph shows the adjacent subreddits your audience moves through, computed from real commenter co-occurrence. This is where most of the untapped distribution sits.
What works
The top-performing posts in any community over the last six months, ranked by the upvotes and replies they earned. Open them on Reddit to read the ones that landed before you write your own.
Top voices
The most active redditors in any community, ranked by the upvotes and replies they earn there. The people worth reading, learning from, and understanding before you show up yourself.
The data
The map is not a one time scrape. subsmap re-reads public Reddit activity daily, recomputes community overlap from commenter co-occurrence, and re-scores every subreddit, so what you see reflects Reddit as it is this week rather than last year.
Everything else
The map is the start. These are the details that decide whether a post lands or gets removed.
Every subreddit's posting rules read into plain answers, pulled straight from the subreddit's own configuration — so you know the gate before you hit post.
Activity by hour and weekday for the exact subreddit you are targeting, in your timezone, computed from when recent posts were actually submitted.
Keep the target subreddits for a launch together so you can come back to the shortlist.
Get alerted when your product, your category or your competitor is mentioned.
See which communities a competitor is already posting in, and how it goes for them.
Track your own posts across every subreddit you target and see clicks, signups and comments per community, so budget and effort move to what works.
Stop guessing which community to post in. Start from the map, post where your customers already are, and learn from what has already worked there.
FAQ
Anything we have not covered here, ask us directly and we will get back to you.
Reddit search shows you posts. subsmap shows you communities. You get keyword search across 126,413 mapped subreddits, the overlap between them computed from real commenter co-occurrence, the top-performing posts in each, and who the most active voices are — a research project of several days compressed into one search.
Public Reddit posts, comments and community metadata. Nothing private, nothing behind a login. Overlap between communities is computed from public commenter activity across subreddits.
Community stats, top posts and rankings refresh daily. Historical post performance covers roughly the last six months so recent patterns stay visible.
Following a subreddit's own rules is the only reliable protection, which is why subsmap surfaces those rules alongside every community, including whether links are allowed, self promotion limits and karma gates. Read the rules, contribute before you promote, and post as a person rather than a brand account.
No. subsmap is research and targeting, not automation — there is no AI writing posts here. You write the post, because posts that read like they came from a real person are the only ones that work on Reddit.
Founders launching without a budget, marketers who need channels that are not paid ads, agencies running Reddit for clients, and anyone whose next hundred users are already talking to each other in a community they have not found yet.
Search your niche, open the map, and see the communities worth your next post.
Free during beta. Sign in with Google — no credit card.