I enjoy learning with Babbel because it actually explains different instances to use synonyms and prefixes/tense changes/subject-action changes/etc. This is all written in your known language. It gives all the nuances and information you need that other language apps like Rosetta Stone and Duolingo don't.
It doesn't offer very many languages to learn but if you're spending $300 on the lifetime subscription, you're likely super dedicated to becoming fluent on one specific language. I have Rosetta Stone for a different language and my vocabulary is pretty big but my sentences are garbage and I'm not certain when or why words change. Babbel does a great job of introducing new vocabulary and giving explanations of when and why to change a word. You can practice with listening and select the answer from a list of written answers, by speaking, with flashcards, or picture decks with spoken words as the clue. The app has a few glitches with the microphone but sending a report to the tech team is fairly simple. Overall, worth half the price of what I paid ($300 for lifetime after 4 months of testing it with a monthly subscription).
Edited original review since I was able to apply the code to my existing account.