Refreshed daily from public Reddit activity

The map of Reddit.

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.

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Map Overlap Posts Voices 126,413 subreddits · mapped by shared audience
126,413
subreddits mapped
7.8M
redditors indexed
6 mo
of post history
Daily
data refresh

Discovery

Find the subreddits for your niche in seconds.

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.

Results for “saas” matches and overlapping communities By size
S
r/SaaS
549,606 members · 129,762 posts indexed
550k
S
r/SideProject
613,628 members · 256,782 posts indexed
614k
I
r/indiehackers
147,703 members · 40,160 posts indexed
148k
B
r/buildinpublic
55,311 members · 51,012 posts indexed
55k
M
r/micro_saas
52,750 members · 24,793 posts indexed
53k

Overlap graph

See where else your users hang out.

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.

Overlap r/SaaS and its neighbours Shared commenters
r/SaaS r/micro_saas 19% r/SaasDevelopers 13% r/buildinpublic 13% r/SideProject 11% r/indiehackers 11%

What works

See what actually gets upvoted.

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 posts r/SaaS · last 6 months By upvotes
3.8kupvotes
Top post by u/Crafty-Panic331
1.99kupvotes
Top post by u/pareshmukh
1.35kupvotes
Top post by u/No_Audience9527
1.32kupvotes
Top post by u/Important_Pomelo_407

Top voices

Find the voices shaping each community.

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.

Top voices r/SaaS By upvotes earned
01
u/scanslop
17.6k upvotes · 17,584 comments in r/SaaS
02
u/No_Boysenberry_6827
2.2k upvotes · 1,755 comments in r/SaaS
03
u/HarjjotSinghh
1.9k upvotes · 1,516 comments in r/SaaS
04
u/imagiself
1.3k upvotes · 1,310 comments in r/SaaS

The data

Built on 126,413 subreddits and 7.8 million redditors, refreshed daily.

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.

126,413subreddits mapped
7.8Mredditors indexed
Public onlyposts, comments & metadata
Dailyoverlap recomputed

Everything else

From zero to a working Reddit channel.

The map is the start. These are the details that decide whether a post lands or gets removed.

Posting rules, parsed per subreddit

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.

Linksparsed per sub
Self-promotion rulesparsed per sub
Karma / account-age gateflagged when set
Approved-user onlyflagged when set

Best time to post, per community

Activity by hour and weekday for the exact subreddit you are targeting, in your timezone, computed from when recent posts were actually submitted.

Computed fromreal submission times

Saved subreddits

Keep the target subreddits for a launch together so you can come back to the shortlist.

Keyword and mention tracking

Get alerted when your product, your category or your competitor is mentioned.

Coming soon

Competitor footprint

See which communities a competitor is already posting in, and how it goes for them.

Coming soon

Attribution: which communities actually send traffic

Coming soon

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.

Make Reddit your distribution channel.

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

Questions, answered.

Anything we have not covered here, ask us directly and we will get back to you.

How is this different from just searching Reddit?

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.

Where does the data come from?

Public Reddit posts, comments and community metadata. Nothing private, nothing behind a login. Overlap between communities is computed from public commenter activity across subreddits.

How fresh is the map?

Community stats, top posts and rankings refresh daily. Historical post performance covers roughly the last six months so recent patterns stay visible.

Will posting where you suggest get me banned?

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.

Do you write or schedule the posts for me?

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.

Who is it for?

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.

Post where it actually lands.

Search your niche, open the map, and see the communities worth your next post.

Free during beta. Sign in with Google — no credit card.

r/SideProject614k
r/SaaS550k
r/indiehackers148k
r/buildinpublic55k
r/micro_saas53k