Y Combinator is an American seed accelerator launched in March 2005 and was used to launch over 2,000 companies including Dropbox, Airbnb, Stripe, Reddit, Optimizely, Zenefits, Docker, DoorDash, Mixpanel, Heroku.

Quill is the best way to message with a team or group. Built for productivity and focus, Quill reduces notifications, collects conversations into threads, and gets out of your way — so you can get back to doing what you do best.