TheoryGlass Drills is a local music theory quiz board for short focused practice. Answer key signature, interval, and chord quality questions, then see a plain explanation after each tap. TheoryGlass keeps score, tracks streaks, shows weak spots, and exports a clean local summary. Use it for: - Practicing key signatures without a lesson setup - Naming intervals from simple note pairs - Checking major, minor, diminished, and augmented triads - Seeing why an answer is correct right away - Tracking missed drill types locally - Exporting a short practice summary TheoryGlass Drills works locally. It does not require an account, does not use the microphone, does not record audio, does not sync to a server, and does not upload your answers, notes, or practice history to Paran servers.