San Francisco Founder Communities (2026): 12 Groups Compared

San Francisco has more founder communities per square mile than any city on earth, which is exactly the problem. Half of them are a Slack you will mute in a week. The other half are worth reorganising your calendar for, and the difference is rarely visible from the landing page.

This is a directory of twelve San Francisco founder communities that founders we know actually use in 2026, ordered roughly from earliest stage to latest, with who each one is for and how you get in. Where a community charges, we say so; where the price is only shown at application, we do not guess it.

1. South Park Commons

South Park Commons is a community for the stage before a company exists, the "minus one to zero" phase, run out of South Park in SoMa. Members are usually technical people who have left a job and are exploring what to build next, and the community pairs that with a fund that backs what comes out of it.

Best for: Engineers and researchers between companies who want peers at the same uncertain stage. How to get in: Apply on their site. Selective, and the bar is a track record rather than a pitch.

2. Founders, Inc.

Founders, Inc. runs a campus at Fort Mason for very early founders, with space, a community and a fund. The pitch is proximity: build next to other people building, on the water, with the bridge in the window.

Best for: Pre-seed founders who want a physical home base and a community that shares it. How to get in: Apply. Cohorts are small.

3. Y Combinator

There is no way around it. YC is the largest founder network in the city and the alumni network is the product as much as the batch. It is also the hardest room on this list to enter, and there is no side door: the batch is the only way in.

Best for: Founders with a company and a plan for the next three months. How to get in: Apply for a batch. If you are not in, the YC orbit of alumni events and Demo Day after-parties is open to anyone who knows someone, which in San Francisco is everyone.

4. On Deck Founders

On Deck runs paid fellowship cohorts for founders at the idea and early stage, with a mix of online sessions and in-person meetups, San Francisco being the densest chapter. The value is the cohort: a few dozen people at your stage who will still take your call in a year.

Best for: Founders who want structure and a cohort, and are willing to pay for it. How to get in: Apply; fees are shown at application.

5. Founders Network

Founders Network is a peer mentorship community for tech founders, with roots in San Francisco and a model built around small monthly groups rather than events. It is quieter than the others on this list and that is the point.

Best for: Founders who want a standing peer group with an agenda. How to get in: Apply. Paid membership, tiered by stage.

6. Cerebral Valley

Cerebral Valley is the AI community that grew out of Hayes Valley's concentration of AI startups. It runs hackathons, a newsletter and events that pull in the people building on the current generation of models. If you are building in AI and you have not been to one, you are missing the room where the hires happen.

Best for: AI founders and the engineers they want to hire. How to get in: Turn up. Most events are free; hackathons need a sign-up.

7. SF Tech Week

SF Tech Week, backed by a16z, is a decentralised week of hundreds of events across the city each October, most of them free and most of them hosted by startups, funds and communities rather than by the organisers. It is the best single week of the year to meet people, and the worst week to have anything else in your calendar.

Best for: Anyone new to the city, and anyone raising in the autumn. How to get in: Register on the site, then pick ten events and skip the rest.

8. Shack15

Shack15 is a members' club in the Ferry Building for founders and investors: workspace, events and a bar with a view of the bay. It is the closest thing San Francisco has to a founders' clubhouse, and it prices like one.

Best for: Founders who want a place to take investor meetings that is not a coffee shop. How to get in: Apply for membership; monthly dues.

9. Hampton

Hampton, founded by Sam Parr, runs paid peer groups for founders past a revenue or funding threshold, checked at application. The format is a small confidential group that meets monthly with a facilitator, the same model EO pioneered, with a younger and more online membership.

Best for: Founders with real revenue who want a standing group of peers at the same scale. How to get in: Apply. The threshold and the fee are stated in the application.

10. Entrepreneurs' Organization San Francisco

EO is the global peer-group organisation for founders past the $1M revenue mark, with a San Francisco chapter. Membership means a confidential Forum of eight to ten peers that meets monthly, an initiation fee and annual dues.

Best for: Post-revenue founders who want a Forum that will outlast their current company. How to get in: Sponsorship by an existing member, then vetting.

11. Startup Grind San Francisco

Startup Grind's San Francisco chapter runs fireside chats and mixers with notable founders and investors. Worth it when the guest is someone you would pay to hear; skippable when the topic is generic.

Best for: Early founders who want a low-commitment on-ramp. How to get in: Buy a ticket to any event.

12. Founder Feast

Founder Feast is an invite-only founder dinner club. Every Thursday evening a small table of vetted founders and investors meets at a restaurant we picked in the Mission, Hayes Valley, SoMa or North Beach, matched by stage, industry and what each person is working on this year. You see the restaurant and who is coming 48 hours before, nobody pitches, and you pay the restaurant for your own meal. Membership is $49 a month and covers every weekly dinner you book, in San Francisco, Vancouver and Los Angeles alike. Between Thursdays, members meet for coffees, runs and hikes and can reach every other member in the app.

Best for: Founders who are done with badge-scanning and want a standing table of people worth knowing. How to get in: Apply here. A person reads every application, and how it works covers the rest.

The rooms that are not groups

Some of the best founder connection in San Francisco happens in rooms nobody calls a community. Run clubs in the Marina and Golden Gate Park, the coffee line at any Hayes Valley cafe on a weekday morning, the Demo Day after-parties twice a year. We covered those in San Francisco tech networking events and in how to meet founders in San Francisco.

How to pick

A rough decision tree:

• Between companies: South Park Commons, Founders, Inc.
• Idea to first customers: YC if you get in, On Deck or Founders Network for a cohort, Cerebral Valley if you are in AI, Founder Feast for a weekly table.
• Past $1M in revenue: Hampton or EO, plus whichever weekly room you already have.
• New to the city: SF Tech Week in October, then one recurring room for a quarter.
• Want a clubhouse: Shack15.

One warning that holds in every city: joining three communities at once is worse than picking one and showing up for a year. The compounding value comes from the same people watching you build over several quarters, and that only happens where you keep turning up.

Come to a dinner

If you want the standing table without the clubhouse dues, we seat one every Thursday. Read the San Francisco page for the neighbourhoods we book in, what a founder dinner club is for how we compare with the rest of this list, or apply for a seat and pick your first Thursday in the app.