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Enter any two safe-for-work communities. We’ll place their public descriptions, members, growth, topics and collected rule titles side by side — instantly, from data we already have.

r/whatisthisthing vs r/tipofmytongue

Side-by-side using public descriptions, members, growth and rule titles from SubMouse. Missing fields show as n/a. Adult communities are excluded.

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Forgotten titles vs mystery object IDs

r/tipofmytongue helps you find un-Googleable things on the tip of your tongue—a word, song, movie title. r/whatisthisthing is for identifying mysterious physical objects.

Both are live directory communities with SubMouse pages (tipofmytongue about 2.7M, rank #409; whatisthisthing about 3.2M, rank #331). Activity samples diverge sharply: tipofmytongue is text-heavy and very busy in our window (roughly 265 posts per day); whatisthisthing is image/gallery-led (roughly 55 posts per day).

Short rule titles share a Solved! culture but differ on content. tipofmytongue bans people-identification posts and has music-specific rules; whatisthisthing asks for detail and images, bans joke answers and AI-generated answers, and expects Solved! replies. Bring a half-remembered media or phrase to tipofmytongue; bring a photo of an unknown object to whatisthisthing.

  • r/tipofmytongue: forgotten titles/phrases; text requests; reply Solved!.
  • r/whatisthisthing: mystery objects; image/gallery posts; no joke or AI answers.
  • Same solve ritual, different evidence. Both have full SubMouse community pages.

Written comparison based on public descriptions and rule titles · updated 2026-11-06.

r/whatisthisthing

For the identification of mysterious objects

For the identification of mysterious objects

Members
3.2M
7-day growth
+1.3K
Posts/day
55
Directory rank
#331
Created
Sep 5, 2010
Submissions
Link posts

Sample mix: galleries 57%, images 40%, text posts 2%

Rule titles (short names we collected)

  • Be civil
  • Be helpful / No Jokes
  • Try to include a link...
  • Reply "Solved!"
  • DO NOT DELETE YOUR POST
  • Be detailed
  • Do not post AI generated answers.
  • Do not use URL shorteners or tracking links
  • Check the F.A.T.
  • Posts must adhere to submission guidelines

Open r/whatisthisthing on SubMouse

About this community: r/whatisthisthing (#331, about 3.2 million) identifies mysterious objects. Rules: be civil and helpful (no jokes); include links when useful; reply “Solved!”; don’t delete posts; be detailed; no AI answers; no URL shorteners/tracking links; check F.A.T.; follow submission guidelines. Gallery/Image (~55 ppd).

r/tipofmytongue

TOMT: When you can't remember that…thing…

For finding the un-googleable things that are on the tip of your tongue... That word... The name of that song... That movie...

Members
2.7M
7-day growth
+1.3K
Posts/day
264.8
Directory rank
#409
Created
Aug 12, 2009
Submissions
Text posts

Sample mix: text posts 100%

Rule titles (short names we collected)

  • Be civil and respectful to each other.
  • No arbitrary link titles (How to answer including a link)
  • Do not repeat something already suggested.
  • Reply “Solved!” to the first correct answer
  • Do not delete post/answer
  • No reposting within one week.
  • Music posts
  • No People
  • Nothing Illegal
  • Post format
  • No bribes
  • Participation

Open r/tipofmytongue on SubMouse

About this community: r/tipofmytongue (#409, about 2.7 million) helps find un-googleable things on the tip of your tongue—songs, movies, words, shows. Rules: civil; no arbitrary link titles; don’t repeat suggestions; reply “Solved!” to the first correct answer; don’t delete; format rules; no people-finding, illegal, NSFW, bribes, or AI answers. Very high text volume (~264.8 ppd).

Supported differences

Aspectr/whatisthisthingr/tipofmytongue
Public focus (from each community’s public description) For the identification of mysterious objects For finding the un-googleable things that are on the tip of your tongue... That word... The name of that song... That movie...
Size
r/whatisthisthing is larger in our directory.
 3.2M members 2.7M members
Posting activity (our sample) 55/day 264.8/day
Common post types in our sample galleries 57%, images 40%, text posts 2% text posts 100%
Allowed submission type (meta) Link posts Text posts
Selected rule titles (short names we collected) Be civil; Be helpful / No Jokes; Try to include a link...; Reply "Solved!"; DO NOT DELETE YOUR POST Be civil and respectful to each other.; No arbitrary link titles (How to answer including a link); Do not repeat something already suggested.; Reply “Solved!” to the first correct answer; Do not delete post/answer

Rules and tone we can verify

tipofmytongue: be civil; no arbitrary link titles; do not repeat suggestions; reply Solved!; do not delete; no reposting within one week; music posts; No People. whatisthisthing: be civil; be helpful / no jokes; include a link when useful; reply Solved!; do not delete; be detailed; no AI-generated answers; no URL shorteners/tracking links.

Where this comparison comes from

Public descriptions and member counts from SubMouse’s safe-for-work directory. Short titles only.

Members and public descriptions come from SubMouse's safe-for-work directory (as of 2026-11-02 UTC); 7-day growth measured from 2026-10-26. Posts/day and post types are shown where recent activity is available. Rule lines are short titles, not the full sidebar. Directory rank is listing order.

Comparisons we prepared

Hand-written explanations for pairs where the public descriptions and rules support a real distinction: