KasusKnacker

Hi Product Hunt, I’m Antonio — indie developer and solo founder. I built KasusKnacker, an app for practicing the most common German grammar pain points, especially the ones that non-native speakers keep struggling with for years. What inspired it was simple: I wanted a straightforward app where I can open it and practice immediately, without being forced through a fixed flow of screens until I “complete” something. Many apps feel too guided for me, and after a while it becomes claustrophobic. I just want practice on demand. No unnecessary animations. I also wanted it to be ad-free, cheaper than most subscriptions, and focused on specific training (cases, articles, prepositions, conjugation). I originally built it for myself (I’m Spanish, living in Germany for 12+ years). My German is good, but I still had grammar gaps that never fully disappeared. The other reason I built it: I wanted to ship an entire product end-to-end using AI tools — not only for coding, but also for exercise generation, translations, copywriting and visuals. The app includes ~30k exercises with translations/explanations, which would have been unrealistic for a solo project without AI. If you try it, I’d love feedback on onboarding, exercise quality, and which practice categories you find most useful. Links (Web / iOS / Android): https://kasusknacker.com Thanks for checking it out.