So, first of all, it is relatively easy to use. The UI does feel somewhat cluttered, but it isn't bad. Of course, like with any social media app, or even any online app, there will be safety and privacy concerns, and parents should ensure their child is staying safe. The app does feature swearing and colourful language, mainly because it is playing real songs. There doesn't appear to be any sort of filtering for this colourful language, but as long as your child does understand what's bad to say and what's VERY bad to say, they should be fine using the app. I myself also believe the concept of the app is bad, but there are other reviews that explain that in further detail.
Overall, as long as your child is mature, they should be fine with it from the age of above around 13-14. I am not aware of any sexual activity in the app, but other reviews suggest there is some, which is why my recommended age is so high. At this age, they've already been through sex education in school, therefore understanding the concept and... stuff.
This title contains:
Ease of Play
Privacy & Safety