Sayit shows a network map of subreddits, judging their similarity by the number of mutual commenters. So if I look up r/seashanties, I see that it’s similar to r/IrishMusic and r/tinwhistle, because a lot of the same redditors write posts and comments on all of these subreddits. (It’s also “similar” to a couple of unrelated video game subreddits, just because those also share a lot of the same members.)
This is a great way to find subreddits that tackle the same topic in different ways. If you subscribe to r/rpg, the sayit graph recommends the subreddits for specific tabletop games like r/Shadowrun, r/DungeonsAndDragons, and r/Pathfinder_RPG. But it also links to:
r/worldbuilding for building out fantasy worlds
r/gametales for great stuff that happened in your game
r/rpghorrorstories for bad stuff that happened in your game
r/characterdrawing for art of RPG characters
r/AskGameMasters for help, ideas, and stories about running a game
r/DnDHomebrew for ways to make your own rules
Plus subreddits about specific settings, editions, and scenarios within D&D and other games. It’s not exhaustive—for example, there’s no link to the small but excellent r/rpghumor—but it can surface connections that you wouldn’t find on Reddit itself.
Click a subreddit to see some recent posts. Double-click a subreddit to start a new graph around it. If you open the r/rpg graph and double-click on r/magicTCG (a big subreddit dedicated to Magic: The Gathering), you’ll see subreddits like r/ModernMagic, r/custommagic, r/spikes, r/gwent, r/BadMtgCombos, r/magicthecirclejerking, r/CompetitiveEDH, and r/hearthstone.
With Sayit you can dig deeper into a topic with more specific subreddits, or find related topics that share a readership. You could look up a political subreddit and find others for people of the same political persuasion, or wade into ones at different points on the spectrum. Look up your city’s main subreddit, and you can find subreddits for housing, jobs, restaurant recs, local politics, or even specific neighbourhoods. It’s like Reddit’s subway map.