create an app for iPhone

I need an app of favors, tasks and points: - Must have chat - Quick and easy "points for tasks or favors" negotiation between two people - Chronometer for "competition task mode". - Create user via email direction and nickname, and send invitation button to other people to use the app via whatsapp sending the name of the app and a link to open in the appstore. - beatiful yet simple buttons and image desings with red and purple theme.