A vocabulary trainer is not the same as a word list. A list shows you words. A trainer asks you for them, notices what you get wrong and asks again until you know it.
It tests you instead of letting you re-read. Recalling a word from memory is the single most effective way to keep it. A good trainer also brings missed words back sooner than words you know well, so your time goes where it is needed.
Regular short practice beats rare long practice. Open the trainer at a fixed moment, for example with your morning coffee or on the commute, and do one short round. Ten focused minutes a day add up to far more than an hour once a week.
1000 Words trains the words of its 1000-word course with quizzes and audio, so you learn how a word sounds as well as how it looks. Learning videos and audiobooks are available for many languages if you want to hear the same words again in a relaxed setting.
The trainer works for 33 languages in the same way. Choose your course, practice a little every day and keep going; the method matters more than the amount of time you spend on any single day.