Free Reddit tools for founders and marketers
CommunityMentions has 6 free Reddit tools for founders and marketers, built on 35,381 AI-answer citations of Reddit threads and 59,860 verified comments from our own delivery. Find the right subreddits, see when to post, test whether AI answers name your brand and price a Reddit Ads test. No signup and no card.
6
free tools, no signup
35,381
Reddit citations in AI answers tracked
59,860
verified Reddit comments we placed
1,325
communities in the subreddit list
Every free tool, and the job each one does
Subreddit finder
Which subreddits fit my product?
Describe your product and get communities ranked by how often AI answers cite their threads.
Best for: choosing communities for a product
Price: free, no signup
Built on 35,381 AI-answer citations and 59,860 verified comments we placed. Data updated Nov 2026.
Subreddit list
Which subreddits do AI answers link to?
Search and sort every community AI answers cited at least 3 times, with counts by engine.
Best for: seeing which communities AI answers cite
Price: free, no signup
Built on 1,325 communities. Data updated Nov 2026.
AI visibility prompt generator
What should I ask ChatGPT about my brand?
Enter your brand and buyer to get 15 prompts, split by the questions that lead AI answers to Reddit.
Best for: testing whether AI answers name your brand
Price: free, no signup
Built on 14,564 Reddit thread citations in 105 communities. Data updated Nov 2026.
Best time to post on Reddit
When should I post in this subreddit?
See when the past month's top posts went up in each community, by day and hour in your time zone.
Best for: timing a post in one community
Price: free, no signup
Built on 20,202 top posts in 205 communities. Data updated Nov 2026.
Most popular subreddits
What are the biggest communities on Reddit?
Rank the communities in Reddit's popular listing by members, Reddit's own order or AI citations.
Best for: sizing up the largest communities
Price: free, no signup
Built on 962 communities from Reddit's listing. Data updated Nov 2026.
Reddit Ads cost calculator
What will a Reddit Ads test cost me?
Enter a target cost per result, a daily budget and a test length to see which of Reddit's budget rules you meet.
Best for: pricing a Reddit Ads test
Price: free, no signup
Built on Reddit's own budget guidance, read October 31, 2026.
Which tool answers which question
Each tool answers one question. Pick the one closest to what you need now.
| Your question | Tool | Data as of |
|---|---|---|
| Which subreddits fit my product? | Subreddit finder | Nov 8, 2026 |
| Which subreddits do AI answers link to? | Subreddit list | Nov 8, 2026 |
| What should I ask ChatGPT about my brand? | AI visibility prompt generator | Nov 8, 2026 |
| When should I post in this subreddit? | Best time to post on Reddit | Nov 8, 2026 |
| What are the biggest communities on Reddit? | Most popular subreddits | Nov 4, 2026 |
| What will a Reddit Ads test cost me? | Reddit Ads cost calculator | Read October 31, 2026 |
Also free
A sample of comments for your website. The free sample reads your site and shows the Reddit comments we would post, with no card and the first comments in about 2 minutes.
Subreddit data for AI assistants. Our MCP server lets Claude, ChatGPT and other assistants look up the same subreddit data.
A page for each subreddit. The subreddit data pages show each community's AI citations by engine and its most-cited threads.
How we build these
Each tool runs on data we collect for our own service or on public sources. AI citation counts cover the buyer-style questions we track for our clients' niches, Jan 9, 2026 to Nov 6, 2026, so they lean toward the markets our clients sell in. On the subreddit data pages a count under 50 shows as "under 50", and the subreddit list leaves out anything cited fewer than 3 times. Each tool page gives its own method and the date its data was read, and the full method covers the citation data.
Sources
- AI-answer citations and verified comments: CommunityMentions tracking and delivery data, as of Nov 8, 2026.
- Subreddit list: CommunityMentions AI-answer tracking, as of Nov 8, 2026.
- Posting times: the past month's top posts in each community, as of Nov 8, 2026.
- Most popular subreddits: Reddit's popular-communities listing, read Nov 4, 2026.
- Reddit Ads budget rules: Reddit's advertising cost guide, read October 31, 2026.
Frequently asked questions
Are these Reddit tools really free?
Yes. None of the tools on this page asks for an email, an account or a card. We also sell a done-for-you Reddit marketing service for $1,000 a month, for people who would rather not do this themselves.
Which Reddit tool should I start with?
Start with the subreddit finder if you do not know where your buyers are. Use the best time to post tool once you have picked a community. Use the prompt generator if your question is whether AI answers mention your brand at all.
Where do the numbers come from?
Most come from our AI-answer tracking and delivery database, updated on the dates shown above. The most popular list comes from Reddit's own listing and the posting times from public top posts. The ads calculator uses Reddit's published guidance and says when it was read.
Can an AI assistant use this data?
Yes. Our free MCP server gives assistants two tools, one to match a product to subreddits and one to look up a single subreddit's numbers. The setup is on the MCP server page.
Want the comments written and posted for you?
Paste your website and see the comments we would post for you. Free, no card, first comments in about 2 minutes.
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