LinkedIn vs Foundinity: where should you look for a cofounder?

Side by side

The sections below go through each row, then give practical steps for a cofounder search on LinkedIn, the situations where each fits, and answers to the questions people search most.

What LinkedIn is

LinkedIn is a professional network. People list where they've worked and studied, connect with colleagues, and post updates. Recruiters use it to find candidates, and job seekers use it to find work. Nothing on it is set up for a cofounder search: there's no way to say you're looking for one, and no way to see who else is.

That doesn't make it useless. LinkedIn is the best public record most people have of their working life. If someone says they led engineering at a startup for three years, their profile, their connections and the people they worked with can tell you whether that holds up.

What Foundinity is

Foundinity is a cofounder matching platform. Everyone who joins is there to find a cofounder, whether they're ready to start next month or just exploring. You state what you need in a cofounder, and answer an assessment about how you work: commitment, working style, ambition, personality, goals, values, alongside your skills and interests. A multi-trait algorithm built on established psychological compatibility models ranks the people you see.

Every match comes with a compatibility breakdown that shows where the two of you align and where you differ, and a 10-day clock so the conversation happens. You book the intro call inside the app.

How each one works, step by step

On Foundinity

1. Sign up and say what you need in a cofounder. 2. Take the assessment about how you work. 3. Open the app to people ranked by compatibility. 4. Like the people you want to meet. When the like is mutual, it's a match. 5. Read the compatibility breakdown, then book the intro call in the app before the 10-day clock runs out.

On LinkedIn

1. Work out who might be open to starting something. LinkedIn has no field for this, so you guess from job histories and posts. 2. Search for people by title, company or school, or look through your own connections. 3. Message your connections directly. For anyone else, send a connection request and wait, or use InMail if you have Premium. 4. Wait for replies. Many people you write to won't be thinking about a startup at all. 5. On the calls that do happen, find out whether they want to start a company, how much time they have, and how they like to work.

Steps 1 and 5 are where the time goes. On Foundinity, step 1 is answered by the fact that someone joined, and part of step 5 is in the breakdown before you meet.

Who you'll find there

LinkedIn's members are people with jobs, people looking for jobs and people hiring. Some of them would start a company with the right person. You can't tell which ones from the profile, and asking a stranger "would you leave your job for a startup with me?" is a big first message.

On Foundinity, the question is settled before you start. Everyone you see joined to find a cofounder. Some are ready now and some have their status set to exploring, but none of them will be surprised that you want to talk about starting something.

How you find people

On LinkedIn you search, or you ask around. You can look people up by role, company and school, and you can scroll through your own connections. The search shows who has done a job. It doesn't show who wants to build something, or who would want to build it with you.

Foundinity does the first sort for you. You state what you need in a cofounder, and answer an assessment about how you work: commitment, working style, ambition, personality, goals, values, alongside your skills and interests. The people you see are ranked by compatibility on multiple dimensions around who you are and how you work, so you start with people who fit what you asked for instead of a list of job titles.

Reaching out

LinkedIn's help pages are clear about messaging. With a free account, you can only directly message members you're connected to. To message anyone else you need InMail, and "You must upgrade to a Premium account to use InMail messages." Premium Career includes 5 InMail credits a month and Premium Business 15. There's no plan with unlimited InMail.

A few more rules shape how a cold search on LinkedIn goes:

• You can't send a second InMail to someone until they've replied to the first.
• Credits come back when the person accepts, declines or replies within 90 days, so unanswered messages cost you.
• Members can choose not to receive InMail at all.
• Connection requests have limits too. LinkedIn says it has "invitation limits in place" and may temporarily restrict accounts that reach them, without publishing the number.
• Premium members who turn on Open Profile can be messaged for free, but LinkedIn limits how many Open Profile messages you can send.

On Foundinity, you like the people you want to meet. When the like is mutual, it's a match and you can talk. Both of you have already said you're looking, so the first message doesn't have to explain why you're writing.

What you know before the first call

A LinkedIn profile is written for employers. It lists roles, dates and skills, and it's good at showing what someone has done. It doesn't say how many hours they could put into a startup, whether they want to raise money or grow slowly, or how they handle disagreement. You find that out one call at a time.

Every Foundinity match comes with a compatibility breakdown: where the two of you align and where you differ. If you differ on commitment or ambition, you can raise it in the first ten minutes instead of finding out in month three. Skills tell you who can do the job. The rest tells you who you can actually build with for years.

Searching while you're employed

Most people looking for a cofounder still have a job, and LinkedIn is the network their employer sees too. A post that says "looking for a cofounder" goes to your colleagues and your manager. LinkedIn's #OpenToWork feature, which is built for job searches, shows how hard this is: if you share it with all members, that "includes recruiters and people at your current company". Even the recruiters-only setting comes with LinkedIn's note that it "can't guarantee complete privacy".

Foundinity doesn't publish your profile. Only members who are compatible with you can see it, and you can set your status to exploring while you look around.

After you connect

On LinkedIn, a conversation lives in your inbox next to recruiter messages and sales pitches. Whether it turns into a call, and when, is up to the two of you.

On Foundinity, a 10-day clock starts on every match. That keeps matches from sitting unanswered for weeks. You book the intro call in the app with Google Calendar, so there's no back and forth over times.

Where LinkedIn helps: checking the person

Once you've found someone, LinkedIn is useful in a way no matching platform is. Use it to:

• Check the work history. Do the roles and dates match what they told you?
• Find mutual contacts. Someone who worked with them can tell you how they handle a deadline or a bad quarter.
• Look for things they've built. Posts, projects and companies they link to give you something to ask about.
• Ask for a reference. Before you commit time to a trial project, a short call with a former colleague is worth it.

This is the split we'd suggest: Foundinity for finding the person, LinkedIn for checking them afterwards.

How to find a cofounder on LinkedIn

If you want to search on LinkedIn as well, these steps make it more likely to work.

Start with people who already know you. In a Censuswide survey of 500 cofounders for Starling Bank, reported by Startups.co.uk in April 2026, 34% met their cofounder through friends and family and 26% at a former workplace. Go through your old teams first. These people know how you work, and you know how they work.

Write one post about what you're building. Say what the problem is, what you've done so far, what skills you need and how much time you're asking for. "Looking for a technical cofounder" gets scrolled past. "I've signed three clinics for a physiotherapy booking tool and need someone to build the scheduling side" gets forwarded.

Ask for introductions instead of writing cold. A free account can only message connections, so a mutual contact is your way in. Ask them to introduce you with one line about why you'd get on.

Make connection requests specific. Say why you're writing to that person in particular. Invitation limits mean you can't send many, so spend them on people with a reason to reply.

If you pay for InMail, write fewer and better messages. Premium Career gives you 5 a month. You can't follow up until they reply, and a message can run to 2,000 characters, which is more than enough. Say who you are, what you're building, why you picked them, and ask for a short call.

Look for people who have done it before. People who have worked at early startups, run side projects, or left a company to build something tend to say so on their profile.

Think before you post if you're employed. Anything public reaches your colleagues. A quiet message to former colleagues reaches the people who matter without telling your current team.

Move from messages to a call fast. LinkedIn threads drift. Suggest a 20-minute call in your first or second message.

Which one fits your situation

You have a large network of people you've worked with. Go through it on LinkedIn first; former colleagues are a proven route. Run Foundinity alongside it, so you also meet people who are actively looking and ranked by compatibility.

Your network is small or you've moved to a new city. LinkedIn rewards people who already know a lot of people. On Foundinity, the people you see don't depend on who you know.

You're employed and want to search quietly. Foundinity shows your profile only to compatible members, and the exploring status lets you look without committing. On LinkedIn, anything you post reaches your colleagues too.

You're non-technical and need an engineer. On LinkedIn, a cofounder message to an engineer lands in the same inbox as recruiter messages. On Foundinity, the engineers you see joined to find a cofounder and are ranked by compatibility with you. Our guide on how to find a technical cofounder covers the rest of that search.

You've already met someone and want to check them. Use LinkedIn. Look at the work history, find a mutual contact, and ask what they're like to work with. Then try a short project together.

A past cofounder lost interest after a couple of months. Commitment is part of the Foundinity assessment, and the breakdown shows where you differ on it. A LinkedIn profile won't show it.

Which should you use?

Use Foundinity to find your cofounder. Everyone there is looking, the ranking does the first sort, the compatibility breakdown gives the first call an agenda, and the 10-day clock keeps each match moving.

Keep LinkedIn for what it does well: checking work histories, finding mutual contacts and asking former colleagues what someone is like. Once you've matched with someone on Foundinity, look them up there before you start a trial project. Steve Blank, in an interview with First Round Review, suggests starting with a period of intense work, then "at a minimum, a provisional 30-day working period" before you commit.

If you're also comparing job boards, see Wellfound vs Foundinity. For every other route, from events to forums, see our guide on how to find a cofounder.