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NoaLingua our product
No account, local data, and everything in one deck
Dual subtitles on YouTube and Netflix, clickable words on any page and inside PDFs, shadowing with pronunciation feedback, and 30 practice formats — all feeding one deck stored in your own Chrome profile. Every feature works on the free plan.
Against it: Desktop Chrome only, no mobile app, and a 0.2 release with a very small user base. If maturity matters to you, that is a real reason to choose something else.