How to find a co-founder, even in another country (2026)

The best place to find a co-founder is among people you've already worked or built something with. Strangers can work too, but the odds are lower and nobody publishes a success rate, so treat every new match as a trial, not a partnership.

This guide compares the real matching routes on price and vetting (checked 26 October 2026), shows you how to test someone before you commit, and covers the extra decisions you face when your co-founder lives in another country.

Where co-founders actually come from

Most good co-founders come from your existing network: colleagues, classmates and friends you've built things with. In YC's Startup Library, partner Harj Taggar suggests starting with friends and colleagues and doing small projects together, because asking someone to join a project is far less daunting than asking them to start a company.

His reason is stress. He calls how someone handles stress the single most important thing to know about them before you start a company together, and the only reliable way to know is to have been through something hard with them. He also suggests a referral method: ask each person you approach who they'd try to recruit, and ask for introductions. Your list grows from there.

So before you open a matching site, write down:

• Everyone you've shipped something with, at work, at uni or on a side project.
• People whose work you've watched closely, such as in open source, a community or a hackathon.
• Who each of them would recommend.

YC thinks co-founders matter enough to build a product for it. When it launched Co-Founder Matching in 2021, it said only four of the top 100 YC companies came to YC without a co-founder.

The honest odds with strangers

Matching with a stranger can work, but you start with no shared history, so you have to build it fast. YC's matching page says it has made over 100,000 matches, but a match only means two people accepted an invite to talk. YC hasn't published how many of those became companies.

What YC has published is a 2021 write-up of two pairs who met through the platform and got into its Summer 2021 batch. Both tested each other with trial work first. That's the realistic picture: matching gets you conversations, and the trial is where you find out whether you have a co-founder.

YC's own launch post says it plainly: it'll take more than one video call to decide whether to co-found a company with someone.

Co-founder matching routes compared

The table below covers the routes we could check on each one's own page today. Prices are as shown on 26 October 2026.

YC Co-Founder Matching

YC Co-Founder Matching is the biggest free option and the first one most founders should try. YC says it's completely free, with no equity taken and no obligations, and that anyone looking for a co-founder can use it. You don't need to be in YC.

You create a profile, the matching engine shows you profiles that fit your preferences, and a match happens when someone accepts your invite. Your profile is only visible to other approved members. The Startup School FAQ says YC has to approve your profile first, which may take up to a week, and that you're limited to 15 invites a week to prevent spam. You can use it whether you're solo or already have a co-founder and want another.

CoFoundersLab

CoFoundersLab is a paid-upgrade matching site you can start on for free. Its Premium page lists US$29 a month with a 30-day free trial and cancel anytime, adding unlimited co-founder search, unlimited messages and weekly live events. Its pages don't describe any vetting of members, so the checks are on you.

Founders Network

Founders Network is an invite-only peer network that makes introductions rather than running a matching engine. Its homepage lists "find co-founders" as a focus of its Launch plan, along with warm introductions to founders in your sector and stage. Dues depend on the funding or revenue of your current or past companies, it doesn't publish a price, and all memberships are annual. A membership committee reviews applications monthly.

Entrepreneurs First and Antler

Entrepreneurs First and Antler are investor programmes built around forming teams, so they suit people ready to go full-time. Entrepreneurs First says it helps you find your co-founder through its matching process, offers an equity-free grant while you're ideating and up to $250K of investment once you form a company. It's selective and runs from offices in London, Bangalore and San Francisco.

Antler's Australian residency is an eight-week full-time programme across Sydney, Melbourne and Brisbane. Antler says many people join without a co-founder or a validated idea. Teams it backs are offered AU$260,000 for 12% equity, per its April 2026 post. Both are in-person programmes, so they don't solve the "my co-founder lives elsewhere" problem.

Reddit: r/cofounder and r/startups

Reddit is where a lot of people post co-founder searches, especially r/cofounder and a recurring co-founder thread on r/startups. We couldn't open either subreddit's rules or sidebar today (Reddit blocked our reader), so we can't tell you the current posting format. Read the rules on each subreddit before you post. There's no vetting, so treat replies like any cold contact.

Hackathons

Hackathons are the closest thing to a free trial project with a stranger. lablab.ai says all its events are free to attend; some are fully online, some hybrid and some on-site only. On Devpost, each hackathon has a Participants page where you can tick that you're looking for a team, describe yourself and send a one-time team-up request to other registrants. You can filter the Devpost listings by online or in-person.

A weekend build shows you how someone codes, communicates and handles a deadline. That's more than ten video calls will tell you.

Founder communities

Founder communities work slowly but well, because you see how people behave over months before you ever talk equity. Our guides to communities for remote founders and communities for AI builders compare the options on price and vetting.

One of those options is Remote Builders (our own community): free to request an invite, and a person reads every request. It has builder dinners in Bali and Australia, city chapters that open where a member hosts, and a member directory with profile pages. The members' chat is being set up and peer circles are planned.

LinkedIn

LinkedIn is useful for reaching people with specific industry experience, but it has no matching or vetting. LinkedIn's help page says free accounts can send up to five personalised invitations with a 200-character note, and you have to upgrade to Premium to send InMail. Search for people who've built in your market, read what they've shipped, and lead with a specific project rather than "want to be my co-founder?".

How to test a co-founder before you commit

Test a co-founder with a time-boxed trial project that has clear deliverables, then decide. YC's launch post encourages matched founders to work together on a time-boxed trial project with clear expectations and goals. Harj Taggar suggests a set period such as a month or three months with a concrete goal, like a prototype or early customer conversations, then an honest conversation about whether you both want to continue.

Set up the trial

1. Pick one outcome you can both see: a working prototype, ten customer interviews, or a landing page with real sign-ups.
2. Set the length up front, such as four weeks, and a check-in each week.
3. Write down who owns what, and how many hours a week each of you will put in.
4. Agree in writing who owns the work if you part ways. If one person is giving up paid work to join, consider paying for the trial so the deal is clear.
5. Hold the end-of-trial conversation on the date you set, even if it's going well.

In YC's write-up, one pair ran a month-long trial, and the other worked on trial projects before becoming fully committed co-founders.

Ask the hard questions

Ask the hard questions during the trial, not after you've incorporated. YC's 10 questions to discuss with a potential co-founder are the best checklist we've found. Grouped by theme:

• Time: What will our working schedule be, and how long can we keep it up? What has to happen for each of us to go full-time?
• Money: What's your personal financial situation? Will you work for free and live on savings, and for how long? How much salary would you need? Will either of us put money in?
• Roles: What will our roles and titles be, and who will be CEO?
• Equity: How will we split it? YC says to resolve this one early.
• Decisions: What will we do if we can't agree on an important decision?
• Exit: What happens if we decide we don't want to work together any more?
• Goals: Why do you want to do this, financially and otherwise? Would you change the idea if it doesn't work?

Taggar adds that conflicting goals cause conflict, such as one founder wanting venture-scale growth and the other wanting a slow, profitable business. Find that out now.

Remote and cross-border basics

A co-founder in another country can work, but three things need answers before you split equity: time zones, which company, and a written agreement.

Time-zone overlap

Agree on the hours you'll both be online before you start. YC's list asks where the company will be based, where each of you will live and whether you'll work in person or remotely. In YC's write-up, one pair worked remotely for four months before meeting in person. Our guide to running a team across time zones covers overlap hours and async habits.

Which country's company

The company's country decides which law governs your shares, how investors can back you and how you get paid. Some founders outside the US form a US company to sell globally and raise money, but it isn't automatic. Our guide to setting up a US LLC as a non-US founder walks through the trade-offs. Decide this before you issue shares, because changing it later is harder.

Equity and vesting in writing

Equity and vesting need a written agreement, not a handshake. YC's Michael Seibel describes four years of vesting with a one-year cliff as the standard: if you leave or get fired within a year, you walk away with nothing. He also recommends equal or near-equal splits between co-founders.

If a US company issues founder shares that vest, US taxpayers have a short deadline. The IRS instructions on Form 15620 say an 83(b) election must be filed no later than 30 days after the date the property was transferred. You can file Form 15620 or a written statement with the IRS Service Center where you file your return. If you live outside the US, ask a cross-border tax adviser how it interacts with your home country's rules.

A fuller guide to splitting equity and setting up vesting across countries is coming.

Common mistakes

• Looking for a co-founder before looking at your network. Strangers are the hardest route. Exhaust people you've built with first.
• Committing after a few calls. YC says it takes more than one video call. Run a trial.
• Splitting equity before a trial. Once shares are issued, they're much harder to take back.
• Skipping vesting because you trust each other. Vesting protects the founder who stays, and you can't predict which one that will be.
• Avoiding the money conversation. Different savings runways and salary needs break partnerships. Ask early.
• No decision rule. Agree how you'll settle a deadlock before you have one.
• Ignoring the company's country. Forming in the wrong place can mean rebuilding the company later.
• Missing the 83(b) deadline. For US taxpayers it's 30 days from the transfer, and Form 15620 says the election must be filed within that window.
• Recruiting for skills only. Taggar puts trust and working chemistry ahead of a perfect skills match, because skill gaps can be filled by hiring.

Co-founder checklist

1. List everyone you've built something with, and ask each for two introductions.
2. Write a one-paragraph description of what you're building, what you bring and what you need.
3. Create a YC Co-Founder Matching profile and allow up to a week for approval.
4. Join one hackathon or founder community where you can work alongside people.
5. Shortlist people based on what they've shipped, not what they say.
6. Run a time-boxed trial with one clear deliverable and a fixed end date.
7. Work through YC's 10 questions together, in writing.
8. Agree your time-zone overlap and working hours.
9. Decide which country's company you'll form before issuing shares.
10. Put the equity split, vesting and IP ownership in a signed agreement, prepared or reviewed by a lawyer.
11. If you're a US taxpayer receiving vesting shares, file the 83(b) election within 30 days.
12. Set a date three months in to review how the partnership is working.