Paste any website URL and instantly discover the 12 best subreddits for your product, startup, or brand, with relevance scores, self-promo tolerance, and posting tips.
Paste a URL above to get started
Example: paste https://yourapp.com and get 12 subreddits ranked by how well their audience matches your website.
Relevance Score
9/10
Self-Promo Tolerance
High / Medium / Low
Posting Tip
Personalized per subreddit
Four steps from URL to a ranked list of communities ready for you to post in.
Enter any publicly accessible URL. The tool handles missing https:// prefixes automatically. Works for landing pages, homepages, tool pages, or any public HTML page.
It fetches your page with a 10-second timeout and extracts the page title, meta description, Open Graph title and description, and the first three H1 and H2 headings. No cookies, no login data, only public HTML.
The extracted content is sent to GPT-4o mini, which identifies the topic, audience, and business type, then finds the 12 most relevant subreddits from the thousands it knows about. It considers community culture, self-promo rules, and audience overlap.
Results are sorted by relevance score from 1 to 10. Each subreddit shows its subscriber count, self-promo tolerance rating, a sentence explaining the match, and a tailored posting tip to help you engage without getting banned.
Most subreddit finders ask you to describe your product. That puts the burden on you to summarize it perfectly. Your website already did that work.
You write a one-line description. It misses nuance. "AI writing tool" could mean email copy, blog posts, or Reddit comments.
You accidentally omit key audience signals. "For indie hackers" changes everything but you forgot to mention it.
The AI guesses what your product does instead of reading what you actually wrote about it.
The AI reads your actual title tag, H1, and meta description, the same signals search engines use to understand your page.
Industry-specific language, feature names, and audience clues are all captured automatically from your existing copy.
You spend zero time summarizing. Paste and go. The results reflect your real positioning, not your paraphrase of it.
The tool reads six types of signals from your page, all from the raw HTML, no browser required.
The browser tab title. Usually the most compressed, SEO-optimized description of your page.
The snippet Google shows in search results. Often your best one-liner about what the page does.
The title shown when the page is shared on social media. Sometimes more descriptive than the page title.
The social share description. Often written for humans rather than search engines, so it can be very useful.
The primary page headline. This is usually your most direct value proposition or product description.
Section headers that reveal features, benefits, use cases, and target audiences the page covers.
Getting the list is step one. Here is how to turn those 12 subreddits into actual traffic and signups.
Start with subreddits rated High. These are your safest entry points where you can share your product without building a month of karma first. r/SideProject, r/IMadeThis, and niche communities often fall here.
Click the Open link next to each subreddit and read the pinned rules post. Even High-tolerance subreddits often have specific requirements: only text posts, no direct links, flair required, or dedicated promotional threads on weekends only.
Spend one week commenting genuinely in each target subreddit. Answer questions, share knowledge, upvote good posts. Build a post history that shows you are a member of the community, not a drive-by marketer. Reddit users check profiles before clicking links.
Each card includes a one-sentence posting tip specific to that subreddit. Use it. It tells you whether to frame your post as a question, a launch announcement, a case study, a tutorial, or a tool recommendation.
Use UTM parameters on links you share so Google Analytics shows you which subreddit drove the visit. After 30 days you will know your top two or three subreddits. Double down on those and stop posting in the ones that do not convert.
The tool works great for most public websites. Here is when it struggles and what to do instead.
Sites built entirely in client-side React, Next.js with no SSR, or Angular that ship empty HTML shells. The fetcher gets no useful content. Fix: ensure your page has server-rendered meta tags.
Private URLs, staging environments behind HTTP auth, or Vercel preview deployments that require a login will return a 4xx error or redirect to a login page.
Cloudflare challenges, anti-bot CAPTCHAs, or IP-allowlisted intranets will block the fetch. The tool cannot bypass these protections.
The AI reads non-English content but the subreddit suggestions will default to English-language communities. If your site targets a non-English market, add the country or language to the meta description for better matches.
Subscriber counts are AI estimates from training data and may be months out of date. Use them to compare community size, not as exact figures. Check the real subreddit for current numbers.
Each IP is limited to 5 requests per minute to prevent abuse. If you hit the limit, wait 60 seconds and try again.
The tool works for any public site, but these categories consistently produce the most precise subreddit matches.
Clear value propositions and audience-specific copy make for tight matches. Ideal for founder-led Reddit marketing.
Technical feature language signals exactly which developer subreddits are the right fit.
Product titles and descriptions anchor the AI to a specific category and buyer persona.
Side projects with clear problem-solution copy match strongly to r/SideProject, r/SaaS, and niche communities.
Topic-focused blogs with keyword-rich meta descriptions pull highly specific subreddit recommendations.
Agencies targeting specific industries (legal tech, health, fintech) get matched to both the service type and industry subreddits.
A reference map of top communities by industry, their combined reach, how promotional they allow posts to be, and the post angle that performs best in each.
| Industry | Top 3 Subreddits | Total Subscribers | Self-Promo Tolerance | Best Post Angle |
|---|---|---|---|---|
| SaaS B2B | r/SaaS, r/Entrepreneur, r/startups | 3.4M+ | Medium | Case study with real MRR numbers |
| DTC Ecommerce | r/ecommerce, r/Entrepreneur, r/smallbusiness | 2.8M+ | Low-Medium | What I learned after 500 orders |
| AI Tools | r/artificial, r/ChatGPT, r/MachineLearning | 11.2M+ | Low | Benchmarks or before/after comparison |
| Dev Tools | r/webdev, r/programming, r/ExperiencedDevs | 7.1M+ | Low | Show HN-style: built this, here is the repo |
| Productivity Apps | r/productivity, r/getdisciplined, r/nosurf | 4.3M+ | Medium | Personal system + tool as one component |
| Fintech | r/personalfinance, r/financialindependence, r/investing | 28M+ | Very Low | Educational explainer with data |
| Health and Fitness | r/fitness, r/loseit, r/running | 18.9M+ | Low | Progress story with the tool as one detail |
| Indie Games | r/indiegaming, r/gamedev, r/IndieGaming | 3.2M+ | High | Devlog or GIF showcase of a core mechanic |
| Crypto and Web3 | r/CryptoCurrency, r/ethereum, r/defi | 9.6M+ | Low | Technical deep-dive or protocol analysis |
| EdTech | r/learnprogramming, r/edtech, r/Teachers | 4.7M+ | Medium | Free resource or curriculum walk-through |
| NoCode Tools | r/nocode, r/bubble, r/Glide | 280K+ | High | What I built without writing code |
| Creator Tools | r/NewTubers, r/podcasting, r/editors | 2.1M+ | Medium | Workflow breakdown using the tool |
Eight distinct signals extracted from the raw HTML of your page. Together they give the AI a precise picture of who your product is for and what it does.
Your compressed, keyword-optimized product description in under 60 characters. It is the single strongest signal for topic classification.
The 160-character snippet you write for Google. It typically contains your audience, primary benefit, and differentiator in one sentence.
Open Graph tags are often written for humans sharing on social, making them more conversational and descriptive than SEO-optimized title tags.
Your most prominent value proposition. Usually the clearest statement of what the product does and for whom it is built.
Section headers reveal features, use cases, integrations, and target personas that may not appear in the headline or meta tags.
The AI synthesizes all signals to estimate who the page is addressing: indie hackers, enterprise teams, developers, consumers, or a specific professional.
Whether the page mentions pricing, a free tier, or a free trial is a strong signal for whether to suggest communities that skew toward paid tools versus free resources.
Navigation labels like Pricing, Docs, API, or Blog give context about the product stage, business model, and whether it targets developers or non-technical users.
Some pairings look right on the surface but fail in practice. These are the mismatches founders repeat most often, with the better-fit alternative for each.
Wrong: B2B SaaS tool posting to r/Entrepreneur
Audience skews toward consumer side-hustles and small local businesses, not B2B software buyers.
Better fit: r/SaaS or r/startups for a more operator-minded audience.
Wrong: Dev tool posting to r/SaaS
r/SaaS is mostly founders and non-technical operators. Developers look for code-level context they will not find there.
Better fit: r/webdev, r/programming, or r/devops depending on the tool layer.
Wrong: AI writing tool posting to r/artificial
r/artificial skews toward researchers, ethicists, and ML hobbyists, not content creators or marketers who would actually use it.
Better fit: r/ChatGPT, r/copywriting, or r/blogging depending on the use case.
Wrong: Fintech consumer app posting to r/investing
r/investing users are experienced and actively distrust product promotions, even subtle ones.
Better fit: r/personalfinance for beginners or r/financialindependence for goal-oriented savers.
Wrong: NoCode app builder posting to r/programming
Developers in r/programming view no-code tools skeptically and prefer code-first solutions. Posts often get downvoted.
Better fit: r/nocode or r/Entrepreneur where the audience values speed over technical control.
Wrong: Health supplement DTC brand posting to r/fitness
r/fitness has extremely strict rules against supplements and product promotion. Posts are removed within minutes.
Better fit: r/veganfitness or niche sport subreddits with more relaxed review-style posts.
Wrong: Indie game launching to r/gaming
r/gaming is dominated by AAA titles and has low tolerance for indie promotion. Posts from unknown studios are buried.
Better fit: r/indiegaming or r/gamedev where the community actively supports and discusses independent releases.
Wrong: Creator tool for YouTubers posting to r/NewTubers
r/NewTubers users are beginners focused on their first 100 subscribers. They are not ready to pay for advanced creator tools.
Better fit: r/editors or r/videography where creators are further along and already looking for workflow improvements.
Every subreddit in your results gets a relevance score from 1 to 100. Here is exactly what each range means and what action to take.
The subreddit audience closely matches your product's target user. The topic, vocabulary, and community size all align. These are your tier-one targets.
What to do
Prioritize these first. Engage in the community for at least one week before your first promotional post. Read the sidebar rules in full. Use the provided posting tip as your framing guide.
What NOT to do
Do not assume a high score means no rules. High-fit subreddits often have strict posting guidelines precisely because they attract quality content. Dropping a link with no context will still get removed.
The community has real audience overlap but the match is partial. Your product solves a problem the community cares about, but it is not the primary topic of the subreddit.
What to do
Approach these as value-first communities. Lead with a tutorial, opinion, or question that adds standalone value. Mention your product only if it is the most natural solution in context.
What NOT to do
Do not treat medium-fit subreddits as tier-one targets. Posting a launch announcement in a community that loosely fits your topic almost always reads as spam to the moderators.
The overlap between your product and this subreddit's audience is thin. The AI found a tangential connection but the community is unlikely to respond positively to your content.
What to do
Skip these for now. If you see a low-fit subreddit you believe should be higher, check whether your meta description clearly communicates who your product targets. Improving your page copy often changes the results.
What NOT to do
Do not post in low-fit communities to compensate for fewer high-fit options. One post in the right place is worth 20 posts in the wrong place and will not put your account at risk of a ban.
The moment you have your tool output, here is the exact sequence to follow before you publish anything.
Sort by Top, then All Time. This shows you the tone, format, length, and type of content that community rewards. One hour here saves you weeks of failed posts.
Click on the mod team from the sidebar. If the last mod activity was 6 months ago, the subreddit may be unmoderated and either low-quality or prone to spam floods. Both are signals to deprioritize it.
Read the comments on recent posts, not just the posts themselves. Comment threads reveal the unspoken norms: what gets criticized, what gets praised, which jokes land, and what the community finds annoying.
Many subreddits have AutoMod rules that auto-remove posts from accounts under a karma threshold or accounts younger than 30 days. Post a throwaway comment in a non-promotional thread to verify your account is not shadow-filtered.
Answer questions, add context, share a relevant experience. These comments build your visible post history so that when you do share your product, your profile does not look like a fresh account created solely for promotion.
The best-performing Reddit posts are personal, not corporate. Frame your post around a specific problem you faced, a milestone you hit, or a decision you made. The product is the supporting detail, not the headline.
Many subreddits auto-remove posts that contain links in the body. Put your URL in a comment instead, or use the post link field if the subreddit is link-friendly. Check the rules first. When in doubt, go text-only.
Reddit traffic peaks mid-morning on weekdays in North America. Posting in this window gives your post the best chance of reaching the front page of the subreddit before the day's competition builds up.
Static blog posts ranking the top 10 subreddits for SaaS or for ecommerce feel helpful but they fail for the same structural reasons every time.
Reddit is not static. A subreddit that was ideal for a product category in 2023 may have experienced a moderator change, an influx of low-quality content, a new self-promo rule, or a complete audience demographic shift by the time you post in 2026. Generic lists cannot account for any of this because they are written once and updated rarely, if ever.
URL-based matching solves this at the product level: your specific positioning, feature set, and target persona produce a different result than a category label alone. Two tools both described as "AI writing assistants" can have completely different ideal subreddits depending on whether one targets developers building content pipelines and the other targets solo bloggers.
Common questions about how the tool works and how to get the best results.
The tool fetches your website URL, extracts the page title, meta description, Open Graph tags, and the first few H1 and H2 headings. It then sends that content to an AI model that matches it against thousands of active Reddit communities and returns 12 subreddits ranked by relevance score, with self-promo tolerance ratings and a personalized posting tip for each one.
Your website already contains precise language that defines your product, audience, and positioning. Feeding the actual title tags and headings to the AI produces tighter matches than paraphrasing, because it uses the exact words and phrases your target audience already associates with your brand. It also removes guesswork and saves time.
The tool fetches raw HTML. Sites that render all content through client-side JavaScript and return an empty HTML shell will not have extractable metadata. In that case, the tool will tell you it could not find enough content. The fix is to ensure your page has server-rendered title and meta tags, which is a best practice for SEO regardless.
Self-promo tolerance rates how welcoming each subreddit is to promotional content. High means the community is generally open to product mentions and launch posts. Medium means you need to provide genuine value and build karma first. Low means direct promotion will likely get your post removed or your account banned. Always read the subreddit rules before posting.
Subscriber counts are AI estimates based on training data and give you a reliable sense of community size. Relevance scores are calculated based on how well the extracted website content aligns with each subreddit's topic, audience, and posting culture. For the most current subscriber numbers, check the actual subreddit on Reddit.
Yes. The tool works for SaaS products, e-commerce stores, blogs, agencies, tools, apps, and content sites. The only requirement is that your website is publicly accessible and returns HTML with readable meta content. Private staging environments, password-protected pages, and sites behind firewalls will not work.
You now know where your audience lives on Reddit. MediaFast helps you write posts that fit each community, schedule them at peak times, and track which ones actually convert to signups.
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