The best subreddits for SaaS ideas aren't the biggest ones. r/Entrepreneur and r/startups are fine for market context, but the highest concentration of buyer intent sits in small, professional subreddits — r/msp, r/accounting, r/realtors, r/sysadmin — where posters already run a business and vent, in public, about tools that don't exist. Search each with phrases like "is there a tool that," "still doing this manually," and "would pay for" instead of scrolling the front page.
Every "best subreddits for startup ideas" roundup reads the same way: r/Entrepreneur, r/startups, maybe r/SaaS, sorted by top-of-all-time. That's a fine place to start and a bad place to stop. The subreddits with the densest buyer-intent signal aren't the ones with the most subscribers — they're the small, unglamorous, professional ones where someone is running an actual business and complaining about the exact gap in their software.
Founder and idea subreddits
Start here for context, not conclusions. These communities are populated mostly by other builders, which means high volume, decent discussion quality, and a fair amount of noise from people pitching their own product in the comments.
- r/SaaS — practitioner-run, skews toward founders who've already shipped something. Good for pricing and growth discussion, plus the occasional "what do you use for" thread.
- r/Entrepreneur — the broadest audience for this topic, and the noisiest. Use its search bar for specific phrases; browsing "hot" wastes time.
- r/startups — earlier-stage, slightly more technical. Useful for reading how other founders describe the problem they built around.
- r/smallbusiness — owner-operators, not tech founders. Closer to the buyer's voice than the builder's, which makes it more useful than its Reddit reputation suggests.
- r/EntrepreneurRideAlong — build-in-public journeys that occasionally surface the exact wording someone used to justify the product they built.
IndieHackers is not a subreddit. It's a separate community and forum with its own search — worth checking, but treat it as a seventh stop, not part of this list.
Search for: "is there a tool that," "would pay for," "still doing this manually," "someone should build." Failure mode: huge volume of "how do I get my first customer" posts unrelated to any specific problem, plus heavy self-promotion diluting genuine pain signal.
Where "what tool does X" demand concentrates
There isn't one dominant, high-traffic subreddit purely for software recommendation requests anymore — that role is split across smaller request threads scattered inside vertical and hobbyist subs. Don't chase subscriber counts here; search functionality matters more than which specific community you land in.
The more durable version of this exact signal lives off Reddit entirely: Stack Exchange's Software Recommendations site (the softwarerecs tag). It's not a subreddit, but it carries the identical intent language — "is there a tool that," "what do you use for," "can anyone recommend" — from people who've already concluded a solution should exist and are shopping for one. Because the site exists for exactly one kind of question, its signal-to-noise ratio beats any general subreddit.
Search for: the same solution-seeking phrases plus category names ("invoicing tool," "scheduling app"). Failure mode: lower volume, and answers skew toward free or DIY tools — read for the problem statement, not the accepted answer.
Vertical and professional pain: the goldmine
This is the cluster most idea-hunters skip, and it's the richest one. r/msp, r/accounting, r/realtors, r/dentistry, r/lawfirm, r/restaurateur, r/photography, r/freelance — these are run by and for people who already operate a real business with a real budget. They complain about the boring, unsexy, ignored-by-VCs software gaps that never make it into a Twitter thread, because nobody outside the profession finds them interesting. That obscurity is the point: a missing feature in accounting or MSP tooling is exactly the kind of problem a well-funded startup won't chase, but one focused founder can build a durable business around. The posters here have already cleared the hardest part of any sale — a budget line already exists for this category — so the only open question is whether an existing tool covers their specific workflow.
Search for: the same intent ladder (would pay for, switching, solution-seeking, workaround) plus incumbent tool names — "alternative to," "canceling my subscription to," "[tool] doesn't do." Failure mode: lower post volume than the generalist subs, and a real risk of outsiders misreading domain-specific jargon or regulation. Validate anything found here with someone actually in the profession before you build.
Developer pain (useful, but crowded)
r/webdev, r/devops, r/sysadmin, and r/ExperiencedDevs are worth reading for infrastructure and tooling ideas, and pair well with GitHub Issues as a source. But developers are the most self-sufficient audience here — the instinct to build your own tool instead of paying for one runs deep, and a meaningful share of "pain" posts are actually indie hackers pitching their own product in the comments.
Search for: "still writing a script for" or "is there a tool that" combined with a specific stack. Failure mode: the highest founder-to-buyer ratio of any cluster here — read carefully for who's complaining versus who's selling.
The most valuable subreddit isn't the one with two million members. It's the one with eight thousand accountants who all use the same three tools and are all annoyed by the same missing feature.
How to actually work through this list
Don't read every cluster every day — that's how manual Reddit research turns into a part-time job. Rotate through the professional and vertical subs weekly, since they're lower-volume and slower-moving, and check the founder subs and Stack Exchange more often, since they refresh faster. Use each community's search, not its front page, starting with the highest-intent phrases from buyer-intent signals: the phrases that predict willingness to pay before widening to generic pain language.
Reddit is one source among several worth this treatment — see where to find SaaS ideas for the other five, including a source most people skip entirely: 1-2★ App Store reviews, which carry a switching-intent density Reddit rarely matches.
Reading 15+ subreddits by hand, every day, doesn't scale — so BuyerTell doesn't ask you to. It mines over 30 professional and founder subreddits through Reddit's OAuth API each morning, alongside Hacker News, Stack Exchange, App Store reviews, GitHub Issues, and Lobsters, scores every post by the same buyer-intent ladder described above, and uses Claude Opus 4.8 to synthesize the strongest patterns into three evidence-backed idea briefs delivered to Telegram, Slack, or email. See how the full approach compares on the alternatives page, or read how to come up with a SaaS idea for the process this feeds into.
The takeaway
Skip the top-of-all-time posts on the big founder subs and go straight to search. The subreddits worth building a habit around are the narrow, professional ones where the posters already have money to spend and nobody else is reading closely — that's where the same complaint, phrased in switching or willing-to-pay language, shows up again and again until it's obvious what to build.
Frequently asked questions
What is the best subreddit for finding SaaS ideas?
There's no single best subreddit. r/SaaS and r/Entrepreneur are useful for market context and founder discussion, but narrow professional subreddits like r/msp, r/accounting, and r/realtors tend to produce higher-intent signal, because the people posting already run a business with a budget rather than dreaming about starting one.
Is IndieHackers a subreddit?
No. IndieHackers is a separate community and forum, not part of Reddit. It's worth checking alongside Reddit rather than instead of it, since it has its own search and doesn't appear in Reddit search results.
What should I search for on Reddit to find SaaS ideas?
Search for intent phrases instead of keywords: "is there a tool that," "still doing this manually," "would pay for," and "alternative to [competitor]." These phrases correlate far more strongly with willingness to pay than generic complaint language does.
How does BuyerTell find ideas on Reddit?
BuyerTell uses Reddit's OAuth API to mine over 30 professional and founder subreddits every day, scores every post and comment by buyer-intent language, and uses Claude Opus 4.8 to synthesize the highest-scoring signals into three evidence-backed idea briefs.