Marvel prototype: https://marvelapp.com/24bcg1a
Feedbacks:
• The context text is really small.
• There is no logout button on the user profile.
• Show something special marks some restaurants which have special offers to help users get information easily.
• Change another visual symbolization to symbolize when you finish collecting the stamps. The yellow color I used before looks more like a tap respond.
• Change “Sign in” to “Create an account”. It may help users to understand easily.
• No need for language bar, because iPhone has its own language system.
• Make QR scan button more easily to access.
• Test what happened if there are more restaurants.