Lingualift is not your average spaced repetition program. LinguaLift leverages a scientifically proven spaced repetition algorithm used by doctors in training at Harvard Medical School to optimize your language acquisition and make sure you never forget.
It comes with a 14 day free trial so you can try it to see if it’s for you.
The Lingualift courses currently cover Chinese, Japanese, Russian and French. If you are learning any other language, you should still check out their blog. This contains a mountain of information on improving as a language learner and self study as well as links to lots and lots of other resources.