DuoCards

DuoCards fills a specific niche: vocabulary acquisition from content you already consume. If you're tired of generic word lists and want to learn the words you actually encounter in YouTube videos or news articles, DuoCards is a streamlined solution. The browser extension and YouTube integration make saving words almost frictionless—you watch a video, tap a word, and it's added to your queue. Spaced repetition works well here: the algorithm is solid, and the daily review reminders are effective. Where it falls short is in broader language skills. There's no speaking practice, no listening comprehension beyond reading the words, and no grammar explanations beyond basic courses. For that, you'd need something like Duolingo (for structured lessons) or Pimsleur (for audio-based learning). Compared to Anki, DuoCards is less customizable but far easier to set up, especially if you want to learn from videos. The premium subscription is reasonably priced, and the free tier is usable indefinitely with caps. In practice, intermediate learners who read or watch a lot of target-language content will get the most value. Beginners might find the lack of structure overwhelming. We would recommend DuoCards as a supplement, not a standalone course. One caveat: the app is primarily online; offline support is minimal. And the teacher tool mentioned in older profiles seems to have been phased out—we couldn't confirm it exists anymore. Overall, DuoCards is a focused, effective vocabulary builder best paired with other resources for comprehensive learning.