Y Combinator says it regularly accepts solo founders, and in the same answer advises that you are more likely to succeed with a co-founder. If you are building alone, both halves matter. This guide quotes YC's own FAQ and the current batch dates, separates them from Carta's data on solo founders and from forum opinion, and then turns the solo question into something you can prepare: the risks a reviewer may see in a one-person team, the evidence that answers each one, an illustrative before-and-after answer, a short plan for the days before the deadline and a worksheet you can copy. It is useful without a Soloop account, and Soloop has no connection with YC.
The short answer
Yes, you can apply alone. YC's FAQ answers "Can a single person apply for funding?" with "Yes. We regularly accept solo founders." It continues that one-person startups are tough and that you are more likely to succeed with a co-founder, and it points solo founders to YC Co-Founder Matching.
So the application is not judged on whether you have a co-founder, but a solo application has to show, with evidence, that the company is moving without one. YC does not publish an acceptance rate for solo founders, and third-party estimates of how many solo founders are in recent batches disagree, so this guide does not cite one.
"We regularly accept solo founders." YC still advises that you are more likely to succeed with a co-founder.
YC FAQYC says the founding team should have the skills to build the product themselves rather than outsourcing it, which for most businesses means a technical co-founder.
YC FAQOn-time deadline November 2, 2026 at 8pm PT. On-time applicants get a decision by December 11. The batch runs January to March in San Francisco.
YC Apply$500,000: $125,000 on a post-money SAFE for 7% of the company, plus $375,000 on an uncapped SAFE with a most-favored-nation provision.
YC standard dealYC Co-Founder Matching is free, takes no equity and reports over 100,000 matches.
YC Co-Founder MatchingWhat the data says about solo founders
Carta's Solo Founders Report, published December 9, 2025 and based on tens of thousands of US companies on its platform, shows that building alone is common and becoming more so. It also shows that solo founders raise a smaller share of the money.
New US startups with a solo founder rose from 23.7% in 2019 to 36.3% in the first half of 2025.
Carta Solo Founders Report 2025Solo-led companies were 30% of startups founded in 2024 but received 14.7% of the cash raised in priced equity rounds that year.
Carta Solo Founders Report 2025Solo founders hired their first employee sooner: a median of 399 days after incorporation, against 480 days for companies with several founders.
Carta Solo Founders Report 2025The questions behind the solo question
YC does not list what it worries about in a solo application. The table below is our inference from YC's own advice to have a co-founder and to be able to build the product yourself: the jobs a second founder usually covers, and the evidence that shows you are covering them.
| Dimension | What a reviewer may wonder | Evidence that answers it |
|---|---|---|
| Building | Can one person build and ship the product without outsourcing it? | A working product you built, with dates of releases or a changelog. |
| Selling | Can the same person find and convince users? | Named conversations, users who came back, a pilot or a first payment. |
| Speed | Is one person moving fast enough? | What changed in the last four weeks, with numbers and dates. |
| Judgment | Who challenges the founder's decisions? | A decision you changed because of evidence, and who you ask for advice. |
| Resilience | What happens if the founder stalls or burns out? | A routine you have kept for months, and how you handle the work you do not like. |
| Co-founder choice | Is solo a decision or an accident? | Whether you looked for a co-founder, what you learned, and what you would do if YC asked you to keep looking. |
How to answer "why are you solo?"
Expect the question in some form. YC's FAQ points solo founders to its co-founder matching product, so assume someone will ask whether you have looked. A good answer is short, true and backed by the evidence in the table above.
- State the fact plainly: you are the only founder, and since when.
- Say whether you looked for a co-founder, how, and why it has not happened yet. "I haven't found the right person" is fine if it is true.
- Point to evidence that the company is moving without one: what you built and who uses it.
- Name the gap you know about, for example sales or design, and how you cover it today.
- Do not call an AI tool, a contractor or an advisor your co-founder. Founders are the people who own and run the company.
- Do not add a co-founder just for the application. A rushed partnership is a bigger risk than an honest solo answer.
- Do not argue that co-founders are overrated. YC has told you its view; show your evidence instead.
An illustrative answer, before and after
The founder, product and numbers below are fictional. The example shows the change in writing; it does not predict any decision.
Before: "I'm a solo founder because I move faster alone and AI tools mean I don't need a team. I'm very passionate about this problem and I'm open to finding a co-founder later."
That answer asks the reader to trust a claim and does not show anything.
After: "I've been the only founder since March. I built Shiftnote, shift-handover notes for dental clinics, and shipped 14 releases since then. In the last two weeks 6 clinic managers took a call, 3 started a trial and 1 is paying $49 a month. I spent two months on co-founder matching and met two engineers, but we disagreed on the market. My weakest area is sales, so I do every sales call myself and review the notes weekly with a former clinic operator who advises me."
The second answer gives the reader dates, numbers, a co-founder decision and a known weakness with a plan. Every claim in it can be checked.
A short evidence plan before the deadline
With the Winter 2027 deadline on November 2, 2026, you have about two weeks from the date of this guide. Spend most of that time producing evidence rather than polishing sentences.
- Day 1: write down what you can already prove: what you built, when, and who has used it. Note every number with its date.
- Days 2–8: talk to people who have the problem. Aim for real conversations, not likes; ask about the last time the problem happened.
- Days 2–10: put the product in front of the people who agreed, and record who uses it a second time without a reminder.
- Day 9: if anyone is ready, make a small paid offer. A single payment, or a clear no and the reason, is evidence.
- Days 10–11: write the application from your notes. Use the same numbers in every answer.
- Day 12: ask someone who will be blunt to read it, cut every claim you cannot show, and submit before the deadline.
Worked example: a fictional two-week log
Everything below is fictional: the founder, the product and the outcome. It shows how to read a small evidence log; it is not a benchmark, a customer result or output from Soloop.
The founder of Shiftnote, the invented product from the answer above, contacted 40 clinic managers over two weeks.
| Dimension | Count | What it means |
|---|---|---|
| Managers contacted | 40 | Chosen from clinics with 3 to 10 staff. |
| Replies | 9 (22.5% of contacted) | Interest, not demand. |
| Calls held | 6 (about 67% of replies) | Each call described a real missed handover. |
| Trials started | 3 (half of calls) | The product was tried, not just discussed. |
| Still using after 7 days | 2 (about 67% of trials) | Return without a reminder is stronger evidence. |
| Paying | 1, at $49 a month | One payment is a signal, not a market. Say so in the application. |
Copy the solo application worksheet
Copy this worksheet into your own document; no account is required. Fill in each row with something a reader could check.
| Dimension | Evidence | Gap and plan |
|---|---|---|
| Built | [What you built yourself] / [first release date] / [releases in the last 4 weeks] | [What you could not build alone, and how you handle it] |
| Users | [Conversations] / [people who used it twice] / [payments or pilots, with dates] | [What you will test next and by when] |
| Co-founder | [Did you look? How, and for how long?] / [what you learned] | [What you would do if asked to keep looking] |
| Support | [Advisors or experts you check decisions with] / [one decision they changed] | [The skill you most need next] |
| Answer | [Your why-solo answer in 4 sentences] | [Every claim in it backed by a row above?] |
Where Soloop fits
Soloop is an AI cofounder for solo founders: it runs individual research, marketing and building tasks for a founder. According to the Soloop manual, it can research a market from public sources, write and publish X posts and replies through a connected account, and send outreach through a connected Gmail account.
Soloop has no relationship with Y Combinator, does not affect admissions and is not a co-founder on your application; YC asks about the people who run the company. What it can help with is the evidence. A bounded first request: My product is [URL] for [role]. Find 15 [role]s who have publicly described [problem] in the last three months, with sources, and draft a first email to each asking for a 20-minute conversation. Do not send anything until I approve.
Check the current connections and steps in your workspace, because they can change.
Sources, limitations and refresh
YC's statements, dates and terms come from its FAQ, Apply, standard deal and Co-Founder Matching pages, read on October 20, 2026. Solo-founder figures come from Carta's Solo Founders Report 2025. The reviewer-concern table, answer advice, plan, examples and worksheet are editorial guidance; they are not YC's criteria and do not predict any decision.
This guide will be reviewed by December 15, 2026, after Winter 2027 decisions, and its dates updated when YC opens the next batch.
Other accelerators and grants also accept solo founders, with terms that change often. This guide does not list them; check each program's own page.
The Soloop manual describes market research, X publishing and Gmail outreach.
Soloop product manual