Best subreddits for Startup Founders

Subreddits for startup founders asking better questions about validation, traction, operations, and early company building.

01r/startups2.1M members
Startup founders and operators
The broadest high-intent startup community: traction, fundraising, hiring, market choice, and founder operations.
What to post
Ask for help with specific early-stage decisions including stage, market, constraints, and prior attempts; share lessons from validation, launching, hiring, or pivoting.
What to avoid
Product announcements, open-ended validation requests, or investor-style hype.
Key rule
Posts should discuss ventures designed to grow and scale rapidly, not general small business topics unless framed through startup methods.
02r/Startup_Ideas293k members
Idea-stage founders and startup validators
Fits idea-stage founders who need sharper thinking before committing to a product.
What to post
Ask how to narrow ideas for specific customers and pain points; share validated work and ask what signals matter next.
What to avoid
Vague idea dumps, stealth lead generation, and posts asking the community to build plans.
Key rule
Posts should center on a startup idea, improvement, expansion, combination, or implementation.
03r/Entrepreneur5.2M members
Entrepreneurs, side projects, and small business builders
Useful for founder lessons, customer acquisition, operations, and practical business decisions.
What to post
Share specific business lessons with numbers, context, and takeaways; ask about concrete sales, hiring, pricing, or customer problems.
What to avoid
Do not ask people to DM, check profiles, join lists, or click links.
Key rule
Do not sell, promote, recruit, hire, drive traffic, ask for DMs, drop URLs, or pitch investments outside designated places.
04r/ycombinator187k members
YC applicants and startup founders
Strong for YC-style startup thinking, applications, founder questions, and startup analysis.
What to post
Ask concise questions about YC applications, startup selection, or founder strategy; discuss startup lessons through a YC lens without pitching.
What to avoid
Shallow YC speculation, status games, and promotion disguised as founder questions.
Key rule
The subreddit expects users to read current pinned guidance before posting.
05r/Entrepreneurship133k members
Entrepreneur advice and questions
Works for broader founder questions that are more educational than promotional.
What to post
Ask about business-building tradeoffs with sufficient context for substantive advice; share learnings from customer conversations, operations, or early sales.
What to avoid
Motivational filler, generic how-to questions, and links to your business.
Key rule
Personal attacks, hateful slurs, and uncivil behavior are not tolerated.
06r/SideProject727k members
Side project builders and makers
Useful when the startup is still a project and feedback should focus on the build, not the company story.
What to post
Share what you built and specify the feedback needed from builders; ask how others would position a side project before turning it into a startup.
What to avoid
Link-only launches, upvote requests, and product pages without discussion prompts.
Key rule
Posts should center on something you built or are actively building.

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