FAQ

Here, similar means two communities share many of the same active commenters—not just a similar topic or title. If lots of people comment in both r/programming and r/learnprogramming, those two communities show up as connected. That is different from Reddit search, which mainly matches keywords.

Reddit search is built to find posts and communities by keywords. This finder highlights relationships between communities based on overlapping audiences. That often surfaces smaller or oddly named communities you would never guess from search alone.

The similarity lists come from a fixed research snapshot built around Reddit activity in 2018. Reddit has changed a lot since then—new communities appear, old ones fade, and habits shift. Large mainstream subs often still look familiar; niche subs may feel more dated.

Yes. Start from a big community you already like, open its graph, then click outward into neighbors. Each step stays within audiences that historically overlapped with where you started, which is a practical way to wander into tighter specialty subs.

No. This site is independent and not affiliated with Reddit. It presents public similarity data gathered for visualization projects by Andrei Kashcha (Anvaka), inspired by the original sayit tool.

It comes from analyzing where Reddit users commented during the original study window. Jaccard similarity measures overlap between audiences so strongly overlapping subs rank closer together. Very large defaults sometimes use hand-picked neighbor lists so suggestions stay useful instead of pointing at generic mega-communities.

Subs like AskReddit attract almost everyone, so overlap scores can look inflated across the board. Curated substitute lists replace pure overlap for some giants so you see neighbors that better reflect everyday browsing—not every community on Reddit at once.

Enter a subreddit (you can skip the r/ prefix) and press Enter or tap Find. Your subreddit sits in the center; surrounding circles are close neighbors by audience overlap. Click any circle to jump there and redraw the map around it.

You need the exact subreddit slug today—for example gaming rather than video games. If you are unsure of the spelling, browse the Explore page or try a guess and adjust based on suggestions.

Only subs that appeared with enough activity in the historical dataset are listed. Brand-new subs, tiny subs, or subs that barely commented during that window may not appear.