Howbout, a social-calendar app, raised $8 million in a Series A round led by Goodwater Capital.
The app allows users to sync their calendars and make plans with friends, with features like voting on plans, chat, and sharing photos and videos.
Howbout is targeting young adults and currently has 5 million users, ranked No. 15 on Apple's App Store in the 'Social Networking' category.
The startup is experimenting with potential revenue streams such as subscriptions and partnerships, and has already partnered with Tinder and Sony Music.