Hi r/webdev! I have a bit of a unique backstory for this Showoff Saturday. Back in 1992, while working as a math teacher, I wrote the very first version of a mental math training program named Aritm in C. Fast forward to today, and I have completely modernized it into Aritm SR—a mobile-first web app, now featuring full English support and optional speech recognition. The Tech & Features: Speech Recognition: Users can optionally toggle voice recognition for hands-free answers. It dynamically handles English and Swedish inputs based on the user's preference. State & Storage Options: I split the app into two versions to give users a choice: Local (utilizes browser Local Storage) and Cloud (uses Google's infrastructure to sync progress across multiple devices). UI/UX: Built with automatic dark mode detection based on the user's system preferences. Language localization is handled automatically via the browser's preferred language settings.…