Optilingo is essentially a phrase-bank in slideshow form. Each of the 20 languages available includes 100 lessons, none of which contain information about the topic or learning goals during the writing of this review. You can expect to listen to a series of phrases, and then review (what seems like) the last 45 phrases you have learned before moving onto the next lesson.
The phrases are not in flashcard form — instead, they are in a slideshow with both the English and the target language displayed together. Optilingo advertises learning and practicing with over 29 hours worth of phrases, and while you can surely practice with their phrase-bank, actually learning to speak any of the languages offered using their platform is questionable.
If you are keen on language learning, check out our bank of reviews for other resources.