Alertify is very easy to integrate into a project, it is small, has nice looking dialogs and easy to learn and use. The framework provides a number of good alert templates to take care of the different use cases like success, error, waning, prompts for inputs and others. Review collected by and hosted on G2.com.

I haven't come across anything I would dislike about using alertify in any of my projects Review collected by and hosted on G2.com.