I am very disappointed by google duo app because it is very hard to understand it features. Sometime it get hang. The picture quality sometime get very bad.
Concept of this app÷ The concept of this app is video call and voice call.
Design÷ The app is well design and attract easily
Easy to use÷ The app is very hard to understand I take 1 month to understand this app
Features÷ There are very less features in this app. The features are hard to understand. The main features is video call
Usefulness÷ This app is not usefullness.
My opinion÷ I should tell you go for imo app. Google duo is waste of time.