A free AI-powered tool that reviews your Y Combinator application before you submit it. Built by Lobster Capital, a VC fund 100% focused on YC companies with $40M+ deployed across 100+ YC startups.

Is YC Roaster really free?

Yes, completely free — no catch, no upsell. Lobster Capital built this to give back to the YC community and help more great companies get accepted.

How does YC Roaster work?

Paste your YC application answers or upload a PDF/Word file. You'll receive AI-powered feedback shortly after submission, scored across 7 dimensions — including traction, team, market, and scalability. Applications that show strong potential may get a YC alumni reviewer for deeper, personalized feedback.

What kind of feedback will I get?

A scored evaluation across 7 dimensions with specific strengths, risks, and suggestions tailored to your application. It's not generic advice — the feedback is based on what's actually in your application.

Who built YC Roaster and why?

YC Roaster is built by Lobster Capital, a venture firm 100% focused on investing in YC companies. With 100+ YC companies in their portfolio, this is their way of helping more founders put their best application forward. Not affiliated with Y Combinator.

How is this different from asking ChatGPT to review my application?

YC Roaster is built by a team that invests exclusively in YC companies. The AI uses a purpose-built framework across 7 specific dimensions based on insights from reviewing hundreds of YC applications. Strong applications also get matched with real YC alumni reviewers — something no general-purpose AI can offer.

When should I submit my application?

As early as possible. The sooner you submit, the more time you have to get feedback, iterate, and strengthen your application before the YC deadline.

Will everyone get a Zoom call?

Everyone gets AI-powered written feedback. If you're matched with a YC alumni reviewer and they see strong potential, they may invite you for a 1-on-1 Zoom session.

ChatGPT Now Builds and Hosts Websites. Is an AI App Builder Still a YC W27 Wedge?

On October 1, 2026, OpenAI's "Sites in ChatGPT" page reached the Hacker News front page and pulled in more than 250 points and 250 comments. One commenter summed up the mood in five words: "wow there goes lovable's moat." If you are applying to YC Winter 2027 with anything that turns a prompt into a website or an app, a partner will read your application with that thread in mind.

Short answer: a general-purpose AI website builder is now a very hard W27 pitch. A builder aimed at a job ChatGPT Sites explicitly does not do is still open. Here is how to tell which one you have.

What is ChatGPT Sites?

ChatGPT Sites lets a user describe a website, app, or game in plain language, preview it inside ChatGPT, and publish it on OpenAI's hosting. According to OpenAI's product page and help center:

It is in public beta on Plus, Pro, Business, Enterprise, and Edu plans. Free and Go accounts do not get it.
Published sites live on a ChatGPT-hosted URL, and you can connect a domain you already own.
Sites come with built-in storage for saved data and uploaded files, and visitors can use "Sign in with ChatGPT."
In eligible workspaces, a site can read data from connected tools.
There is no separate price. Usage is included up to plan-specific limits that OpenAI has not published.

The beta has been rolling out since this summer. What changed this week is attention: the feature page trended on Hacker News, and founders who had never opened it took notice.

Is an AI website builder still a fundable YC W27 idea?

A horizontal one, mostly no. The reason is distribution, not model quality. ChatGPT already sits in front of the person who wants a landing page, and the build, the hosting, and the login now ship inside a subscription they are already paying for. "Prompt to website, but better" asks a YC partner to bet on you out-distributing the default.

YC's own recent picks point the same way. Scanning the 108 Fall 2026 companies listed in the YC directory so far, we could not find one pitching a general-purpose site or app builder. The newest launches are narrow: ByteAsk is an AI coding agent for C and C++, TrueMile runs trucking operations with agents, and Asakana turns emails and texts from food distributors into ERP orders.

That does not mean the category is dead. It means the bar moved from "can you generate an app" to "can you own a job the bundled builder will not touch."

What can't ChatGPT Sites do?

OpenAI's help center is unusually clear about the edges. Each one is a possible wedge.

Limit in the public beta	Wedge it leaves open
No data residency or inference residency at launch	Builders for regulated or EU-sensitive buyers
Must not handle protected health information or payment card data	Healthcare, fintech, and commerce apps with real compliance
Usage limits are undisclosed, and busy public sites can be throttled	Production apps with traffic, SLAs, and predictable cost
Hosted on OpenAI's stack with platform storage	Teams that need their own cloud, database, or existing codebase
Web first	Native mobile, hardware, and offline software

If your product lives in one of the right-hand cells and you already have users there, you are not competing with ChatGPT Sites. You are selling what it declined to build.

Which YC companies show how to survive a bundled builder?

Emergent (YC S24) describes itself as an "AI app builder that turns your ideas into monetizable software." Its YC profile reports $50M ARR within seven months and more than 5 million users. The lesson is in the word "monetizable": the pitch is production software that makes money, not a prototype.

a0.dev (YC W25) generates React Native mobile apps and handles iOS builds and App Store submission, with a team of three. It picked a surface, native mobile, where a web-first builder does not reach.

Supabase (YC S20) did not build an app builder at all. It became the database and auth layer that AI builders plug into, so it grows whichever builder wins.

Replit (YC W18) spent years accumulating its own users and its own hosting before agents arrived. It owns distribution, which is the one thing a new entrant cannot copy from a model release.

Outside YC, Base44 is the solo-founder version: a bootstrapped builder that Wix acquired for about $80 million in 2025, only months after launch. Small teams can still win here, but the outcome came from speed and a specific audience, not a general tool.

How do you answer "what if OpenAI builds this?" in your application?

After this week, every builder application gets this question, whether in the written form or the ten-minute interview. A strong answer has three parts.

Concede the commodity. Say plainly that generating and hosting a simple site is now free with a ChatGPT subscription. Partners trust founders who see the board.
Name the job the bundle skips. Use a specific limit from the table above, in a specific industry, with a specific buyer. "HIPAA-ready patient intake apps for dental groups" beats "better quality output."
Show evidence users already chose you over the default. Paying customers, apps in production, retention after the first week. If your users could have used ChatGPT Sites and did not, say why in their words.

A weak answer is "our output is higher quality" or "we use a better model." Both expire with the next release.

What is the takeaway for YC W27 applicants?

The YC Winter 2027 on-time deadline is November 2 at 8pm PT, with decisions promised by December 11. You have about four weeks to do one of three things:

Narrow. Rewrite your one-liner around a customer and a constraint that ChatGPT Sites excludes.
Move down the stack. Sell to the builders: data, auth, payments, testing, security review, or deployment for AI-generated apps.
Prove distribution. If you stay horizontal, lead with a channel OpenAI does not own, such as an existing community, a marketplace, or an enterprise contract.

Before you submit, it helps to have someone who has been through YC read your answer to the "why won't you get crushed" question cold. YC Roaster gives you free AI feedback on your application, and strong applications may be matched with a YC alum for a deeper review. If a stranger can explain your wedge back to you in one sentence, a YC partner will be able to as well.