The latest articles on DEV Community by Mehmet Karpuz (@mkarpuz). https://dev.to/mkarpuz https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3810206%2Ffe16bbb9-3d16-46aa-9048-04552ee7ec6f.jpeg https://dev.to/mkarpuz en Mehmet Karpuz Fri, 06 Mar 2026 16:27:13 +0000 https://dev.to/mkarpuz/i-vibe-coded-a-free-german-learning-app-heres-what-i-actually-ended-up-with-2k92 https://dev.to/mkarpuz/i-vibe-coded-a-free-german-learning-app-heres-what-i-actually-ended-up-with-2k92 <p>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?</p> <p>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.</p> <p>What I used:<br> 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.</p> <p>What it does:<br> Import any German text, article, or podcast transcript<br> Click unknown words to save them instantly<br> Spaced repetition review (SM-2 algorithm)<br> 10 quiz types<br> Completely free<br> 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.</p> <p><a href="//lingustream.com">Here is the link to the beta test website</a></p> <p>Happy to answer any questions in the comments — about the tech stack, the language learning approach, or anything else you're curious about.</p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fiqh7kdyayqny790r2vqf.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fiqh7kdyayqny790r2vqf.png" alt=" " width="800" height="255"></a></p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Ftwszvwejksowh4r55nzb.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Ftwszvwejksowh4r55nzb.png" alt=" " width="800" height="441"></a></p> <p><a href="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F5y33979rs22he8prcmhl.png" class="article-body-image-wrapper"><img src="https://media2.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2F5y33979rs22he8prcmhl.png" alt=" " width="800" height="434"></a></p>