Use the best, no matter who built it. Acquisition / shutdown are just part of the ecosystem. If you’re looking for free sunrise alternatives, checkout http://www.meetnucleus.com

Mobile is a completely different platform from UX to connecting apps. I was an early sunrise user and now it’s shutting down. This is why we’re rebuilding entire experience on managing your time on mobile, especially those with frequent external meetings. We’re currently in private beta and would love to hear your…

I’m on Nucleus’s private beta http://www.meetnucleus.com. Best alternative by far but only for iOS & Google Accounts.