How to message a potential cofounder: first messages, follow-ups and what to cut, with examples

Most people overthink the first message to a potential cofounder, then send something too long, too vague or too eager. The message doesn't have to win anyone over. It has to make a 20-minute conversation seem worth having.

This guide is about those first messages: what to write in each situation, why each example works, what to cut, how to follow up and how to turn a reply into a call. It's the step before our guide on how to ask someone to be your cofounder, which covers the whole process up to the actual question, weeks later. Once you have a call booked, our questions to ask a potential cofounder will help you use it.

Every message on this page is an example we wrote for this guide. None are quotes from real people or real conversations. The names are made up. Copy the structure and change the details so they're true for you.

The first message in five parts

Almost every good first message to a potential cofounder has the same five parts, in this order:

1. Them. One line that could only be written to this person: something they built, wrote, said or put in their profile. 2. You. One line on who you are, with a fact rather than a label. 3. The work. One or two lines on what you're working on and how far you've got. 4. The ask. Something small with a size and an end: a 20-minute call next week, coffee after Thursday's meetup. 5. The out. A line that makes "no" easy to say.

Keep it short. In Boomerang's analysis of more than 40 million emails, messages of 50 to 125 words all had response rates above 50%, and emails with one to three questions were about 50% more likely to get a reply than emails with none (Boomerang). That's general email, not cofounder outreach, but the shape holds: short, plain, and ending in one clear question.

Expect fewer replies than you think

Written requests are easier to ignore than you'd guess. In a study published in 2017, M. Mahdi Roghanizad and Vanessa Bohns had participants ask strangers to fill in a short survey, either face to face or by email. The people asking by email guessed, on average, that 5.5 in 10 strangers would agree. Fewer than 1 in 10 did, while face-to-face requests succeeded about 8 times in 10 (Phys.org). A 2021 follow-up by the same researchers found in-person requests beat video and phone, which in turn beat email and text (Cornell Chronicle).

Two practical lessons follow. Don't read silence as a verdict on you or your idea: written messages simply get ignored more than people expect. And use your messages to move to a voice or video call, or a meeting in person, as early as you can, because that's where people say yes.

Message 1: to a match on a cofounder platform

When you've both opted in to looking, you can skip the explanation of why you're writing. The reader already knows. Use what you can see in their profile, and get to a time.

Example: "Hi Daniel, thanks for the match. Your profile says you spent four years building integrations for hospital systems, which is exactly the part I'm stuck on: I've got 12 dental clinics using a no-code reminder tool, and syncing with their booking software is the wall. I'm in London and can do a 30-minute call Tuesday or Thursday evening this week. Would either work? If you'd rather swap a couple of messages first, that's fine too."

Why it works: it proves the writer read the profile, links the other person's experience to a real problem, and offers two specific times.

What to cut: "I think we'd be a great fit" (they'll decide that), a paragraph about your background (it's on your profile), and the full plan for the product.

When they liked you first

Example: "Hi Anika, glad you reached out. I read your profile: I've never worked in freight, so your years running a brokerage desk are interesting to me. I'm a product engineer exploring problems in small-business logistics, no fixed idea yet. Shall we do 30 minutes this week? I'm free Wednesday after 6pm or Saturday morning, IST."

Why it works: it's warm without gushing, asks a question that's easy to answer, and moves straight to times.

Messaging a match on Foundinity

On Foundinity, a match has a limited number of messages before a call is booked, and a 10-day clock: if no call is scheduled in time, the match expires. That's deliberate. Messages are a poor way to judge a cofounder, and the limit stops promising matches from fading into long threads. It also changes how you should write.

A simple plan for your messages before the call:

• First message: the five parts above, with one or two suggested times.
• Second message: answer their question, if they asked one, and confirm a time.
• Then book the call in the app, where you choose a slot from a calendar and send the request.

Save the questions about hours, money and goals for the call. You'll get better answers in 30 minutes of talking than in a dozen messages.

Message 2: a cold LinkedIn message

LinkedIn's help pages say a personal note on a connection request can be up to 200 characters, and members without Premium can add a note to up to three connection requests a month. That's two short sentences, and a small budget, so spend the notes on the people you most want to reach.

Example connection note (168 characters): "Hi Maya, your post on why clinics drop booking software matched what I heard from 22 clinic owners. I'm an engineer working on this. Open to a 20-minute call next week?"

Template: "Hi [name], your [post, talk or project] on [topic] matched what I heard from [number] [customers]. I'm [role] working on [problem]. Open to a 20-minute call next week?"

If they accept, send a fuller message straight away, while your name is fresh:

Example follow-up after they accept: "Thanks for connecting, Maya. A bit more context: I'm a backend engineer, and over the last two months I've interviewed 22 clinic owners about no-shows. Twelve now use a rough reminder tool I built. Your post made the point I keep hearing, that clinics give up when the software doesn't fit their front desk. I'd like to hear how you'd approach it, and to be honest, I'm also looking for someone with your background to build this with. Would 20 minutes on Tuesday or Wednesday work?"

Why it works: the note fits the limit and gives a reason to accept. The follow-up adds evidence and is honest about the cofounder search without making it the ask.

What to cut: "I'd love to add you to my network" (says nothing), and any link to a pitch deck.

Message 3: a cold email

Email gives you more room, which is mostly a temptation to write too much. The subject line does the first job. In the Boomerang data, subject lines of three or four words got the most responses.

Example subject lines:

• "Your offline sync post"
• "Question about clinic no-shows"
• "Freight paperwork, 20 minutes?"
• "From Thursday's meetup"

Example email: "Hi Tom, I read your write-up on why approval chains break in mid-sized manufacturers, especially the point about approvals living in email. I've spent six years in procurement and I'm building a tool aimed at exactly that; four plants are testing a first version. I'm looking for someone who has built software for this kind of buyer, ideally as a cofounder, but I'd value your view either way. Would you have 20 minutes next week to tell me what I'm getting wrong? If now's a bad time, no reply needed."

Why it works: about 90 words, one question, a specific reason for writing to Tom, evidence instead of adjectives, and an honest mention of the cofounder search.

What to add below your name: one link to something people can look at, such as a demo, a short write-up of your customer interviews or your profile.

Message 4: after an event or meetup

Asking in person beats asking in writing, so the best follow-up starts before you leave: "Shall we pick this up next week?" Then write within a day or two, while you're both still remembered.

Example to a speaker after a talk: "Hi Grace, I was the person who asked about rural pharmacies at last night's health-tech meetup. Your answer about delivery windows changed how I think about the problem. I've been interviewing pharmacists for two months and would like to compare notes. Coffee near the station next week, or a call if that's easier?"

Example to a hackathon teammate (short message): "Good working with you this weekend, Sam. You held the whole demo together at 3am. I'd like to keep going with the inventory idea for a few weeks and see if it's real. Want to meet on Wednesday to plan it?"

Why it works: each reminds the person who you are with one detail, mentions something specific they did, and suggests a next step with a date.

What to cut: "It was great to meet you!" with nothing after it. Every follow-up after an event needs a reason and a next step.

Message 5: someone you already know

Messages to friends and close colleagues are covered in how to ask someone to be your cofounder. Two situations come up often and are different enough to need their own examples.

Someone you haven't spoken to in years

A former classmate or colleague from two jobs ago is a weak tie: you know each other, but you'll need to reintroduce yourself and explain why now.

Example: "Hi Leo, it's been a while: we worked on the warehouse project together in 2021. I saw you've moved into data engineering. I've left my job to work on stock forecasting for independent grocers, and three shops are trying a first version. You're the first person I thought of for the data side. Could we catch up on a call next week? Even if it's not for you, I'd value your view."

Why it works: it gives the shared context in one line, shows the writer has followed what Leo is doing, and gives a clear reason for getting in touch now.

Asking a friend for an introduction

When a friend knows someone you'd like to meet, make it easy for them. Ask first whether they're comfortable introducing you, and give them a short paragraph they can forward without editing.

Example request: "Would you be comfortable introducing me to Priya? No pressure if not. If yes, here's a short note you can forward so she can decide whether she wants the intro."

Example forwardable note: "[Your name] is a product designer who has spent the last two months interviewing 30 independent gym owners about member churn, and has a prototype five gyms are testing. They're looking for an engineer to build it with, and would like 20 minutes of Priya's time to hear how she'd approach the data side."

Why it works: the friend can forward it in one click, Priya can say no to the friend without saying no to you, and the note says what you want in plain words.

Replying when someone messages you first

You'll get messages too. A clear reply, even a no, keeps your reputation good in what is often a small world.

Example yes: "Thanks, this sounds interesting. I can do 30 minutes on Thursday at 7pm CET or Saturday at 10am. Before we talk, could you send the interview notes you mentioned?"

Example not now: "Thanks for thinking of me. I'm committed to my current project until March, so I can't take on anything new before then. Could I get back in touch in the spring?"

Example no: "Thanks for writing, and good luck with it. It's not the right fit for me: I'm looking to work in climate rather than health. If I meet someone who might be a fit, I'll send them your way."

How to follow up on a message to a potential cofounder

Follow up once, after about a week. If there's still no reply, stop, or send one more only if you have something new to say.

Data from sales and link-building outreach suggests one follow-up is worth sending. In a 2019 analysis of 12 million outreach emails, Backlinko and Pitchbox reported that one follow-up raised the reply rate by 65.8% (Backlinko). Those were mostly pitches to website owners, not cofounder messages, so treat the number as a hint rather than a rule.

Example follow-up (short bump): "Bringing this back to the top of your inbox in case it got buried. No worries if the timing's wrong."

Example follow-up (something new): "Quick update since I wrote: two more clinics started using the tool this week, and the sync problem is now the main thing holding it back. Still keen to hear your view if you have 20 minutes."

Example closing the loop: "I'll stop filling your inbox. If you'd ever like to talk about this, I'd be glad to hear from you."

Rules of thumb:

• One follow-up after about a week. A second only if something real has changed, and two weeks or more later.
• Shorter each time. The follow-up should be half the length of the first message.
• No guilt. "I haven't heard back" and "just following up again" make replying feel like an obligation.
• No new channels. If you emailed, don't also message them on three other apps.

Moving from messages to a call

Once someone replies with interest, get a time on the calendar in your next message. Long back-and-forth threads before a first call rarely add anything a call wouldn't.

Example: "Great. How about 30 minutes on Tuesday at 6pm UK time (7pm for you), or Thursday at the same time? I'll send a video link. I'd like to hear what you're working on now, show you the prototype for five minutes, and see if it's worth a second conversation."

What makes a scheduling message work:

• Two specific times, in their time zone as well as yours.
• A length, so they know what they're agreeing to.
• A one-line agenda, so neither of you turns up expecting a pitch.
• A link, or a note on who sends it.

What not to send in a first message

• A pitch deck. It turns a conversation into an evaluation, and it's usually built for investors, not partners.
• An NDA. Asking a stranger to sign something before a first call ends most conversations. Our post on whether a cofounder will steal your idea covers how to share an idea in stages instead.
• Talk of ownership, titles or terms. These belong much later, once you've worked together and both want to continue.
• "Will you be my cofounder?" Too big a question for a first message.
• A long description of the idea. Two sentences are enough to judge whether it's interesting.
• A copied message with the wrong name or details. Personal details are the whole point; getting them wrong is worse than leaving them out.
• Flattery with no detail. "You're incredible" says you didn't read anything.
• Pressure. Deadlines, "once in a lifetime" and "I need an answer by Friday" end conversations.
• A voice note or a call out of the blue. Many people find them intrusive from someone they don't know.
• A link to sign up for your product. It reads as marketing.

Before and after: rewriting a weak first message

Before (example): "Hey! I came across your profile and I think you'd be perfect for my startup. I'm building a revolutionary AI platform that will disrupt the restaurant industry. We're in stealth so I can't share too much, but it's going to be huge. I've attached our deck. I'm looking for a technical cofounder who is passionate and ready to commit 100%. Let me know if you're interested in joining!"

Problems: nothing specific about the reader, no evidence, a secret idea, a deck, a commitment demanded before a conversation, and an ask that's far too big.

After (example): "Hi Ines, your talk on kitchen display systems at the food-tech meetup was the first explanation of order timing that made sense to me. I ran two restaurants for six years, and I'm working on prep forecasting for small kitchens; eight restaurants have shared their order data with me so far. I need someone who has built software for kitchens, and I'm looking for a cofounder, but a first call is all I'm asking for. Would 20 minutes next Tuesday or Wednesday work?"

What changed: a specific reason for writing to Ines, a fact about the writer, evidence of progress, an honest mention of the cofounder search and an ask with a size.

A checklist before you hit send

• The first line could only have been written to this person.
• There's at least one fact about what you've done.
• The idea takes two sentences at most.
• There's one clear question, with a size and a time.
• It's under about 125 words (or 200 characters for a LinkedIn note).
• There's an easy way to say no.
• No deck, no NDA, nothing about ownership or terms.
• Names, details and time zones are correct.
• You've read it out loud once.

If your profile is what people see before they reply, make sure it backs up the message. Our guide on how to write a cofounder profile goes through it field by field.

Where Foundinity fits

Messages get easier when the person reading already fits what you need. On Foundinity, 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, so the people you write to are compatible to start with.

• A compatibility breakdown on every match shows where the two of you align and where you differ, which gives your first message something specific to mention.
• A limited number of messages and a 10-day clock on each match push you both towards a call, and you book it in the app.
• Your profile isn't public. Only compatible members can see it, and an "exploring" status lets you look before you commit.
• Pricing: free to get started; Plus is $5 a week or $15 a month. See how it works.

FAQ

How do you message a potential cofounder?

Write a short message with one specific line about them, one line about you with a fact, one or two lines on what you're working on, and a small ask such as a 20-minute call. Add an easy way to say no. Don't ask them to be your cofounder in the first message.

What should my first message to a potential cofounder say?

Why you're writing to this person in particular, who you are, what you've done so far, and one clear question with a time attached. About 50 to 125 words is enough.

How long should a message to a potential cofounder be?

Short. Boomerang's analysis of more than 40 million emails found messages of 50 to 125 words got the best response rates. A LinkedIn connection note is capped at 200 characters.

How do you write a cold LinkedIn message to a potential cofounder?

Use the connection note (up to 200 characters) to give one specific reason for connecting and ask for a short call. Once they accept, send a fuller message with your evidence and two suggested times.

Should I mention that I'm looking for a cofounder in the first message?

Yes, honestly and briefly, but don't make it the ask. "I'm also looking for someone with your background to build this with, but a call is all I'm asking for" works well.

How long should I wait before following up?

About a week. Send one short follow-up, and a second only if you have something new to share, two weeks or more later. Then stop.

What if a potential cofounder doesn't reply?

Follow up once, then let it go. Research on email requests shows people expect far more replies than they get, so silence usually isn't personal.

Should I send my pitch deck to a potential cofounder?

Not in the first message. A deck turns a conversation into an evaluation. Show it on the call, or send it afterwards if they ask.

How do I move from messages to a call?

As soon as they reply with interest, suggest two specific times in both time zones, say how long the call will be, give a one-line agenda and say who will send the link.

What should I say on the first call?

Let them talk first about what they're working on and what they want next, then share your work briefly and agree a next step. Our questions to ask a potential cofounder has a full list.

How do I reply to someone who wants me as their cofounder?

Reply either way. If you're interested, offer two times and ask for something to read first. If not, say so kindly and briefly, and offer to pass on anyone who might fit.

Sources

• Boomerang, "7 Tips for Getting More Responses to Your Emails (With Data!)", 12 February 2016, checked 13 November 2026.
• Paul Mayne, "Study says forget email, put a face on that plea", Phys.org, 11 May 2017, on Roghanizad and Bohns, "Ask in person: You're less persuasive than you think over email", Journal of Experimental Social Psychology, 2017, checked 13 November 2026.
• "For best results, ask in person instead of over Zoom", Mary Catt, Cornell Chronicle, 14 December 2021, on Roghanizad and Bohns, Social Psychological and Personality Science, checked 13 November 2026.
• Brian Dean, "We Analyzed 12 Million Outreach Emails. Here's What We Learned", Backlinko, data from Pitchbox, updated 16 April 2019, checked 13 November 2026.
• LinkedIn Help, "Personalize invitations to connect" (linkedin.com/help/linkedin/answer/46662), checked 13 November 2026.
• Foundinity matching, messages before a call, the 10-day clock and pricing from foundinity.com, checked 13 November 2026.