But I never got a good answer to a doubt: I submitted my application just now, just because. But I am in a particular good period for user grownth (first customer two weeks ago, and now things are happening). I will have considerably more traction in October (including a reliable growth rate, as it would be at least passed 2 months).
The question: if I update my application on October 14 with the updated traction numbers, will it make a difference?
Will someone actually see it or my application will already be judged and decided and that's it?
Since last batch, wasn't there a "New Deal" that fixed the amount to $120k for 7%? 
I'm happy to review applications, especially from international founders. Roberto at Glio dot com.
It's like founder-dating with a deadline.
Really glad for the application overhaul, looking good.
From the start I new that my limitations were the only things holding me back, so the past 4 years has been largely dedicated to reinventing myself into the type of person that could make Tinj successful.
As for the product, we'll be starting a private beta of Curv soon, a simple way to rate videos after watching by drawing how you felt over time. Can check out the demo at http://tinj.com
If anyone is excited about the potential of tinj or curv, email me at mat at tinj. PS - We're hiring. ;)
An example of things we can build is a recommendation system.
question above comment was asking was why would people generate that content for you.. incentive needs to be there for each piece of content produced.
Thanks for letting us know!
One final nitpick would be to move the timeline at the bottom of https://apply.ycombinator.com to the top.
Otherwise, really cool.
Could be, but that's a lot more work to do when reading applications. Inferring these facts from a heterogeneous and unstructured data source, like hundreds or thousands of bios, requires a lot of effort that is better spent elsewhere. Setting these up as simple red flags, through a series of boxes to check or not check, solves the problem more efficiently. Right off the bat, you can sort all applications by any of the criteria in these boxes. You can do that before even starting to read them. If you're inferring from bios, on the other hand, you have to read every bio before you can sort.
if numWontLiveInBayArea >= total / 2 then flag
if numNonExclusive > 0 then flag
If I'm the only founder, is it considered negative?
Check out http://www.forbes.com/sites/bruceupbin/2011/10/18/paul-graha... for encouragement or go and get a co-founder.
Being a solo-founder, it's a tough ride but no-one said you shouldn't go tough. But also I keep in mind that in order to be a full stack entrepreneur, one needs to be able to attract talent and you need to have a sense to filter out wimps.
Sadly I'm the only founder right now but for one specific reason - to spend time building product instead of dating founders :) But I sure wish to find the one, or two.
Final note regarding solo founders & YC: if you are coming from a non-US country without a working visa and need to move to US to work for your startup then having at least 2 founders is great because then the company has the power to fire you -- which makes it possible for this new company to apply for your visa.
My cofounder and I would like to ask for some critique on our answers including the personal questions. However it seems that the statement, "We will send an email to each founder to fill out additional information about themselves." implies that the application must be submitted before we see the personal questions. I just want to confirm if the first submission should be the final draft before we proceed.
Hopefully the questions about hacking a non-computer system and most impressive thing we've built/achieved are included in the personal questions. Those were some of the most fun to answer.
Making it into YC isn't impossible if you are. Many startups in the current batch are solo founder companies...Product Hunt, Filecoin, Lawn Love, Craft Coffee, etc. We would not reject a startup based on just ONE dimension or question. So if this is the ONLY thing you're worried about, you're in good shape.
A co-founder is generally someone who's goals and interests are closely aligned with yours. Someone who's in it for the long run through all of the peaks and troughs experienced on the startup journey. If you own the majority of the shares and your friend's main interest is the salary you're paying him/her, then his/her goals are not closely aligned with yours.
I don't know how YC will view this but my advice is to think about building a team of co-founders who will stick together through thick and thin and share in the success of the company as well as the struggles. I guess that's why its so important to get good co-founders. You don't want to give half your company to someone who you don't believe offers a whole lot to the company's success. I hope this helps.
If you are simply adding him as a cofounder so that you are not listed as a single founder, don't do that. It may seem like you have to have a cofounder to get into YC, but founders who are new to working together are a bigger red flag than a single founder, and there were several single founder companies in the last batch.
"They did all the same things as the other startups, including present at Demo Day (which is after all a room with lots of rich people in it)."
We do have some foundations and philanthropists invited to Demo Day that'll be more appropriate for nonprofits and have you engage with other nonprofit yc alumni a bit more, but not much else. There's a joke Qasar tells the other startups on how to treat nonprofits in the batch when we first get started, "let's not kid ourselves, you're all nonprofits at this point."
The "How to Apply to Y Combinator" essay hasn't been updated to reflect this change.
Is this a small side web app you guys rolled yourself or are you using a decision-making product (like Submittable, etc) for the back-end?
There were 183 founders in the last YC batch. 74 were not born in the United States. That's 40%. They didn't all just come from Canada and UK, they came from 27 different countries. There were actually 17 French founders in this batch, which is the highest concentration we've ever had in a funding cycle.
If your users/customers are in Europe (or elsewhere) and it makes sense, we're not against you learning and raising the money that you need here and taking it back with you to grow.