I've recently used Prefinery (https://www.prefinery.com/ https://www.prefinery.com/) to handle a Beta launch. Highly recommended. Out-of-the-box support for "v

I've recently used Prefinery (https://www.prefinery.com/ https://www.prefinery.com/) to handle a Beta launch. Highly recommended. Out-of-the-box support for "viral" social referrals, exporting to MailChimp, webhooks to notify of new sign-ups. Nice minimalist bootstrap interface as well.