You've got a great visualization concept of time zone scheduling, which is worth a lot. But the UI alone as a stand-alone web app is easy to replicate and not very sticky. As a next step I would build a plugin for Google Calendar and Outlook using the same data visualization concept. This would help users figure out which times to suggest for a call with someone in a different time zone, and they would be able to generate an invite right from the plugin. Then I would introduce scheduling interaction between users through the plugin. For example if user A uses the plugin to suggest a time for a call with person B in a different time zone, person B would benefit immensely if he/she could not only accept/decline but also see what other times are available purely from a time zone perspective (ideally also taking into account other appointments that user A has). This would increase stickiness and virality while also allowing you to establish a business. Not sure yet whether contextual advertising using call subjects or a subscription model would work better.
Come to think of it, this is all pretty trivial but I had fun thinking about it. Good luck!
You've got a great visualization concept of time zone scheduling, which is worth a lot. But the UI alone as a stand-alone web app is easy to replicate and not very sticky. As a next step I would build a plugin for Google Calendar and Outlook using the same data visualization concept. This would help users figure out which times to suggest for a call with someone in a different time zone, and they would be able to generate an invite right from the plugin. Then I would introduce scheduling interaction between users through the plugin. For example if user A uses the plugin to suggest a time for a call with person B in a different time zone, person B would benefit immensely if he/she could not only accept/decline but also see what other times are available purely from a time zone perspective (ideally also taking into account other appointments that user A has). This would increase stickiness and virality while also allowing you to establish a business. Not sure yet whether contextual advertising using call subjects or a subscription model would work better.
Come to think of it, this is all pretty trivial but I had fun thinking about it. Good luck!