WordDive
A paid app for word practice

WordDive is an application developed in Finland that allows you to study vocabulary and some basic grammar. The vocabulary is organised by topic into modules, ranging from elementary to C1 level. The words are accompanied by an audio file, an example of usage, and often also synonyms. The use of the programme is fairly intuitive. The application is suitable for those who find traditional vocabulary learning boring or challenging. Author: a company.

Pros
fun and gamified
efficient (learn new words without effort)
a new word always has a usage context (an example phrase)
the application works in several languages
suitable for busy people
Cons
mainly teaches Standard Finnish
not free