Quick picks: is this the tool you need?
- You want the whole ranking and will sort it yourself: open the subreddit list.
- You'd rather describe your product and get 10 matches back: use the subreddit finder instead.
- You want one niche ranked for you: the best subreddits for AI and software page is one of the niche lists.
- You already know the subreddit and want its most-cited threads: open its data page, for example r/SaaS.
- You want an AI assistant to query the same data: the MCP server has a get_subreddit tool.
- You want comments posted for you, not a list: run the free sample.
What the list does
Each row is one subreddit with seven numbers: total AI citations, the split between ChatGPT, Perplexity and Gemini, how many different threads were cited, the last date one was cited, and the member count where we have read it. A citation is one link to one of the subreddit's threads inside one AI answer we tracked. The list keeps subreddits linked 3 or more times, so a single stray link doesn't count as a pattern.
The first 100 rows, sorted by citations, arrive in the page itself. The rest of the 1,325 load the first time you search, filter or sort. Nothing is sent to a server when you search; the filtering happens in your browser.
How to use it
Each step lists what done looks like.
| Step | What to do | What done looks like |
|---|---|---|
| 1 | Type a word from your market into the search box, such as "saas", "marketing" or "skincare" | The table shows only subreddits whose names contain the word |
| 2 | Sort by AI citations | The subreddits AI answers lean on most for that word are at the top |
| 3 | Read the engine columns for your top rows | You know whether ChatGPT, Perplexity or Gemini drives each one |
| 4 | Switch the sort to Last seen | You've dropped rows not cited since before October; those threads may have stopped showing up |
| 5 | Open the data page for rows that link to one, then read the subreddit's rules on Reddit | You have a short list of subreddits, their most-cited threads, and whether brand mentions are allowed |
A worked example: "saas" and "marketing"
We read these rows from the list's data on November 12, 2026. r/SaaS is the 10th most-cited subreddit in the whole list. Its last citation in our data was October 30, 2026, which matters when you compare it with a row last seen in early October.
| Subreddit | Rank by citations | AI citations | ChatGPT / Perplexity / Gemini | Threads cited | Last seen |
|---|---|---|---|---|---|
| r/SaaS | 10 | 302 | 40 / 208 / 54 | 95 | Oct 30, 2026 |
| r/b2bmarketing | 21 | 234 | 22 / 150 / 62 | 52 | Oct 16, 2026 |
| r/smallbusiness | 23 | 210 | 20 / 164 / 26 | 77 | Oct 23, 2026 |
| r/Entrepreneur | 30 | 170 | 13 / 135 / 22 | 45 | Oct 23, 2026 |
| r/marketing | 125 | 52 | 0 / 35 / 17 | 18 | Oct 9, 2026 |
What the example shows
- Size is not the ranking. r/smallbusiness had about 2.47 million members when we read it and r/b2bmarketing about 90,000, yet r/b2bmarketing drew more citations (234 to 210).
- Perplexity supplies most of the citations on every row above. ChatGPT cited r/marketing threads 0 times in our data.
- A broad name can rank low. r/marketing sits at 125, below several narrower subreddits.
What the whole list shows
Across all 1,325 subreddits, Perplexity answers account for 68.6% of the 30,635 citations, Gemini for 20.8% and ChatGPT for 10.6%. In 941 subreddits, Perplexity alone cites more threads than the other two engines together. Citations are spread out: the top 10 subreddits hold 13.4% of them and the top 100 hold 52.7%. The median subreddit in the list was cited 8 times; 131 were cited 50 or more times and 60 were cited 100 or more times. Those numbers come from the list's own data, as of November 8, 2026.
Doing it yourself or having it done
The list tells you where AI answers look. Being in those threads is the work that follows. CommunityMentions does that for $1,000 a month, month to month, after a free sample and a $1 setup charge; monthly billing starts only after you approve the voice in Slack. The free sample shows the comments we'd post for your site before you pay anything.
Limits to know
- Search matches subreddit names only, not topics or thread titles. For a description match, use the subreddit finder.
- Only 180 of the 1,325 subreddits have a topic group, so filtering by topic shows those 180 and hides the rest.
- Member counts are read for 489 subreddits; the others show "not read".
- The engines tracked are ChatGPT, Perplexity and Gemini. Claude and Google's AI Overviews are not in these counts.
- 130 subreddits whose names matched a sensitive-topic filter (health, drugs, legal help, adult, gambling) are left out, and the filter reads names only.
- The data runs to November 6, 2026. A subreddit cited heavily before then can fade from answers since.
Sources
- Subreddit list, page and data read November 12, 2026: 1,325 subreddits, data as of November 8, 2026, AI answers tracked January 9 to November 6, 2026.
- CommunityMentions AI answer tracking: 80,500 answers from ChatGPT, Perplexity and Gemini, January 9 to November 6, 2026, with each Reddit link counted by subreddit and thread; read November 12, 2026.
- Our price and terms: pricing section and company facts, read November 12, 2026.