Table 2.

Percentage of participants who were satisfied with the app's features.

Features	Satisfied/agreed (%)
Aesthetics
•The design and layout are attractive	86
•Color and design style are attractive	85
•The icon is easy to understand	85
•The layout is clear without any confusion	85
•The overall UI design	89
Functionality
•Easy to find and download the app	77
•Easy to complete the registration	94
•This app is easy to navigate	87
•I would imagine that most people would learn to use this app very quickly	90
•This app is easy to navigate	89
•Information on the app is easy to find	88
•The app responds fast	91
•The app is stable	91
•The overall story line (dessert, ocean, and new chapter)	91
•This app is easy to navigate	95
•I know each function well	80
•The rules and instructions in this app are clear to me	91
•How easy to comply with the assigned tasks during the whole usage experience	93
Engagement
•The survey is customized for me	78
•It is fun and motivating to use	85
•The task is interesting and exciting	68
•The task is interactive and motivating	76
•The task is relevant to me	83
•The assignments are customized for me	68
•The overall usage experience	90
•How would you describe your overall experience with the product?	98
•After these days' usage, how likely would you recommend this app to a friend who wants to quit smoking?	75
•Would you like to stay in the app to share the cessation experience to help others?	86
•Would you like to continue to use this app if possible?	95
Information
•How much do you agree “this app will help me to quit smoking successfully”?	87
•The tasks are helpful on quitting smoking	91
•What would you say about the end result of this quit attempt with app assistant by now?	97
•How would you describe your craving of smoking during past 2 weeks?	99
•How would you describe your craving of smoking during the past 1 month?	98
•Do you think this app is effective in helping smoking cessation?	97