01
NoaLingua our product
No account, local data, and everything in one deck
Evidence: first-hand product source and captures
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.