An accelerator application is short, and it is read fast. Partners at a large programme may read hundreds in a week, so the founders who get interviews are usually the ones whose answers can be understood in a minute. This guide covers how to pick programmes worth applying to, what a good application looks like, what happens in the interview and what to do with a no.
Before you apply
Applying takes real time, so start with a shortlist rather than every programme you have heard of. Four filters remove most of the wrong ones:
- Stage. Some programmes take idea-stage companies; others want a product, users or revenue. Each listing shows the stages a programme names.
- Sector and place. Many programmes focus on one sector or one region, and some require you to be there in person for the whole programme.
- Terms. What it invests, the equity it takes and any fee. The deal terms table compares every programme that publishes them, and the accelerator dilution calculator shows what the stake costs you later.
- Dates. When applications close and when the programme starts. Accelerators run on deadlines, and missing one can mean a wait of months. The deadlines page lists every window closing in the next 90 days.
Read the programme’s own application page closely. Y Combinator’s apply page, read on 18 October 2026, gives an on-time deadline of 2 November 2026 at 8pm Pacific time for its Winter 2027 batch, which runs from January to March in San Francisco, and says late applications are considered without a promised reply date. Details like that change between cohorts, which is why every listing here shows the day we last checked it.
Some programmes are built for people who are not yet a company. Entrepreneur First backs individuals before they have a co-founder or an idea. If that is you, a programme like that may fit better than a standard accelerator.
Write an application a stranger understands
The best-known advice comes from Paul Graham’s essay How to Apply to Y Combinator. Its central point is clarity: say what your company does in the first sentence, in plain words, because the reader has many more applications waiting. Graham also writes that of the groups good enough to interview, more than half spoil their chances with an unclear application. A few habits follow from that:
- Lead with what you make and who pays for it. “We sell scheduling software to dental clinics” beats a paragraph about the future of healthcare.
- Answer the question that was asked. Short, direct answers are easier to read than polished essays.
- Use numbers. Users, revenue, growth rate, signed pilots, how long you have worked on it. If you have none yet, say what you have learned from customers.
- Explain why you. What do the founders know or have done that makes this team likely to succeed at this problem?
- Cut jargon. “Platform”, “ecosystem” and “AI-powered” tell the reader nothing on their own.
Do not hold back because the company is early. Y Combinator’s FAQ says that on average 40% of the companies it funds in each batch are just an idea, and that it regularly accepts solo founders. Programmes that want more traction say so in their eligibility rules, and the listing shows them.
Before you submit, give the application to someone outside the company. If they cannot explain back what you do and why it will work, rewrite it.
The interview and the decision
Most programmes interview a shortlist, increasingly by video. Y Combinator’s apply page says most of its interviews are held by video conference in November and December, that it usually decides on the day of the interview, and that it invests in companies as soon as they are accepted.
Techstars describes its process in a blog post of 12 January 2026. The application takes one to four hours the first time, and goes into a general pool as well as to the programmes you pick. Interviews come in rounds, the first with a screening committee by video, and invitations arrive one to four weeks after the deadline. Techstars says it aims to review every application within four weeks of applications closing.
Whatever the format, interviews are short and fast, so prepare like this:
- Know your numbers cold. Users, revenue, costs, how much money you have and how long it lasts.
- Practise the hard questions. Why now, who else is doing this, what is the biggest risk, and what happens if a large company copies you.
- Have every founder ready to speak. Interviewers watch how the team works together as much as what it says.
- Ask your own questions. What do companies get, what do they give, and what did the last cohort go on to do?
If you receive an offer, ask for every document in the deal, including side letters, before you accept. Our guide to red flags in accelerator terms lists what to check.
If the answer is no
Most applicants are turned down, and at the most selective programmes the share accepted is very small; our guide to the Y Combinator acceptance rate sets out every figure YC has published, with its date. A rejection is rarely a verdict on the company. It usually means the programme saw too little evidence, too little clarity, or simply more applicants than places.
Reapplying is normal. Y Combinator’s FAQ says about half the companies it funds applied more than once before being accepted. When you reapply, lead with what has changed: new customers, revenue, a finished product, a new co-founder. The same application again rarely gets a different answer.
Ask for feedback, but do not count on it: large programmes rarely have time to explain each decision. Your own review is more useful. Read the application again as a stranger would, and ask whether a partner could repeat what the company does, who it serves and why it will grow, after one quick read.
Meanwhile, keep building and widen the list:
- Other accelerators with a better fit for your sector or region, in the accelerators section.
- Incubators and university programmes, which often take earlier companies; see accelerator or incubator?.
- Grants and pitch competitions, which bring money without equity; see grants or accelerators?.
A no from one programme does not stop a company raising later. Progress is what changes the answer, and it is also what makes the next investor meeting easier.
Sources
Each page was read on the date shown. Figures in this guide carry the date the source gives them.
- Y Combinator: Apply to YC. Undated page, open for the Winter 2027 batch. Read 18 October 2026.
- Y Combinator: Frequently asked questions. Undated page. Read 18 October 2026.
- Y Combinator: How to Apply to Y Combinator (Paul Graham). Undated essay. Read 18 October 2026.
- Techstars: Inside a Techstars Accelerator: The Application and Interview Process. Published 12 January 2026. Read 18 October 2026.