Sorted by job. Want feedback? Try r/SideProject. Or r/roastmystartup. Want testers? Try r/AlphaandBetausers. Want advice from people who run things, not a place to promote? Try r/startups and r/Entrepreneur. Want peers in the same trade? Try r/SaaS and r/smallbusiness. But the sub that gets you customers is almost never a founder sub. It’s wherever your buyer complains.
TL;DR
- “Best subreddits for founders” hides two questions. Where do founders hang out? And where are my buyers? Those two lists barely match.
- Founder subs are good at four jobs. They tear your idea apart. They find you testers. They get a launch seen. They pass on advice from people who run things. None of those is demand.
- Pick the room by the job you have this week, not by the number in the sidebar.
- The room that matters is where people spell out your problem in their own words. Nobody asked them to. It takes about twenty searches to find.
The question people mean, and the question they ask
Search for “best subreddits for founders”. You get back a ranked list of the biggest rooms where founders gather. That list is accurate and it usually isn’t what you needed.
Two different jobs hide behind the same phrase. One is I want to talk to people like me. That’s fair, and the founder subs do it well. The other is I want customers. For that job, founder subs are close to the worst place you can stand. Everyone there is selling. Nobody there is buying. Unless, of course, you sell to founders. Then your buyer sub and your peer sub are the same room. You have it easy. And it’s why so much Reddit advice comes from people in just that spot.
For everyone else, the useful move is to sort by job.
Founder subs, by what they’re actually for
| The job this week | Where | What you’re walking into |
|---|---|---|
| Get the idea torn apart | r/roastmystartup | Critique is the entire premise, so nobody minds you showing up with a link. Expect bluntness; that’s the trade. |
| Recruit early testers | r/AlphaandBetausers | Exists specifically so founders can find people willing to try unfinished things. Low volume, high fit. |
| Show a working thing | r/SideProject | Built for show-and-tell. The unwritten bar is that it has to be usable — a waitlist page reads as a pitch, not a project. |
| Learn from operators | r/startups, r/Entrepreneur | Promotion is confined to designated threads and direct links get removed. Come for the reading and the comments. |
| Talk shop with peers | r/SaaS, r/smallbusiness, r/EntrepreneurRideAlong | People running the same shape of business as you. Best for questions about how, not for launches. |
Two things to check before posting anywhere on that list. Read the sidebar first. These rooms change their rules. The version you read in a blog post is always a bit out of date. And check whether the sub runs a thread just for promotion. Several of the big ones do. Posting outside it is the top reason a first post vanishes.
You can get removed. You can get shadowbanned. You can get ignored. All three are their own subject, and we wrote it up in how to get users from Reddit. Inside: account age, the karma floor, and why the old 90/10 ratio is dead. And it has a comment template that doesn’t read like marketing.
The sub that isn’t on this list
Now the part that matters.
There is a room on Reddit where people talk about your problem. They use their own words. They have no idea a founder is reading. They’re not asking for a product. They’re venting about a Friday afternoon. Or asking which of two bad workarounds is less bad. That room is worth more than all the subs in the table above put together. And it doesn’t have the word “startup” in its name.
Sell to managed service providers? Then it’s r/msp. Sell to bookkeepers? Then it’s r/accounting. Or r/photography and r/Frontend. Or r/HVAC and r/nonprofit. Or r/Etsy and r/paramedics. The list is as long as the economy, which is exactly why no listicle can hand it to you.
The reason it beats the founder subs is not size and not tolerance. It’s that they weren’t asked. A complaint nobody asked for is as close to a free market signal as you’ll get. Nobody is being polite to you. Nobody is guessing at what they might do in future. They already did the thing. And they were annoyed enough to type about it.
How to find yours in an afternoon
Search their words, not yours. That’s the whole trick. Most founders get it backwards on the first try.
- Write down the problem the way a sufferer would say it. Not “invoice reconciliation platform”. Try: “Every Friday I sit and match payments to invoices by hand.” Three or four phrasings.
- Search Reddit for each phrasing. Read twenty results. Don’t click on anything of your own.
- Note which subreddit keeps showing up. After twenty results, one or two rooms have come up again and again. That’s your answer, and it’s usually a surprise.
- Read that room for a week before you say anything. You’re looking for three things. How do they name the problem? Which workarounds do they use? And how much money do they say it costs? Those phrases are your landing-page copy. The buyer wrote it for you.
- Then go back to the founder subs for the job they do well. That job is having someone tell you the thing is confusing. Better a founder than a stranger.
Step 4 is the one people skip and the one that pays. What you collect here is evidence. It feeds a real test. It doesn’t replace one. The pass and fail marks are in our four-gate framework. Once you have the room, read getting your first users. It covers how to turn readers into people who show up.
When to stop reading and start testing
You’re done when you can predict what the next complaint will say. That usually takes a week of reading. It beats counting posts. A count tells you that you hit a quota. This tells you the pattern has closed.
At that point you have three things: the room, the words, and a claim about what people want. Only the third one is a guess. There’s a cheap way to settle it. Put the promise on a page and see if strangers act. That’s about two weeks and under $200, which is less than the cost of being wrong for a quarter.
This is also the part we built a product around. Finding the rooms and pulling the exact complaints is slow work. And it’s the same twenty searches every time. If you’d rather not do it by hand, that’s what a ProofMachine run does. But the method above works fine with a free afternoon. And you should know how it works either way.