I've been building LinguStream on and off for way too long, and it started as a simple question: why does the best German learning method (LingQ-style immersion) cost money?
The idea is straightforward — you read real German texts, click words you don't know, save them, and review with spaced repetition. No artificial exercises, just real content and vocabulary in context.
What I used:
React 19, TypeScript, Vite, Supabase (auth + database + edge functions), shadcn/ui, Tailwind, and DeepSeek for AI features — all proxied through Supabase edge functions to keep keys off the client. For the vibe coding itself, I leaned heavily on Claude Sonnet and Opus from Anthropic — honestly couldn't have got this far without it.
What it does:
Import any German text, article, or podcast transcript
Click unknown words to save them instantly
Spaced repetition review (SM-2 algorithm)
10 quiz types
Completely free
I'm at the point where I genuinely can't tell if it's actually good anymore — I've been staring at it too long. If you're learning German or just curious, I'd love honest feedback on what works and what doesn't.
Here is the link to the beta test website
Happy to answer any questions in the comments — about the tech stack, the language learning approach, or anything else you're curious about.
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