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If you don't mind making cards and decks yourself, Anki might be it for you. It is a program for memorization, which can be used for language learning. While some pre-made decks can be found at AnkiWeb, you are actually encouraged to make your own.
You can use it on the desktop (through a program) but also as a mobile app. Functionality can be extended using add-ons but only for the desktop version.
More info on the Anki Online Documentation.
EDIT:
Corrected links
Thanks. I've used Anki in the past and might use it for the text part of the job. If I could attach audio files to the cards it would be almost perfect.
Ah, I forgot to include that part in my original reply: you can include images and audio in the cards. In fact, I have a deck I made myself that has audio I took from elsewhere.
Oh! I didn't know than Anki supported audio too. That might be all I need, in that case. Thank you!
I haven't tried it yet, but LLPlayer might be what you're looking for:
That's really interesting, thank you. It looks useful for intermediate to advanced learners. I'm at the stage of building up vocab and simple phrases. I have bookmarked it for future reference!
I wanted to make a website for language learning from/for community. I didn't have anyone interested to collaborate and had to give up to focus on my PhD. I think the app you made if you make it general enough that people can add their data might help if you distribute it to people and let them gather contents
Yeah, basically an application that has spaced repetition but no content would work. It would need to track the users strengths and weaknesses and challenge them the right amount.
What I would ideally develop would allow people to install it locally so they can add their own copyrighted content without getting in trouble.
Practically that would mean slicing up mp3 files to make some kind of audio-based flash cards. Then text from the book would need to be copied and pasted in. Tedious, but worth it if you have quality resources.
I'm sure you have already tried Anki right? It does have audio and offline capabilities, I haven't used it that much. If you just need something, not necessarily related to language then it might be good.
I didn't know it supported audio, I should look into it again. Thanks!