Interval turns scattered music theory drills into a measurable practice habit. Whether you're prepping for a theory exam, returning to an instrument, or sharpening your ear, Interval gives you fast, focused exercises with instant feedback, mastery tracking, and a clean, modern interface — no subscriptions, no account, fully offline. WHAT YOU CAN PRACTICE • Interval identification — read two-note intervals and name them • Scale identification — major, minor, modes, pentatonic, and more • Chord identification — triad and seventh-chord qualities • Keyboard exercises — tap the piano to answer, or name highlighted keys • Ear training — interval, chord, and scale recognition by sound BUILT FOR REAL PROGRESS • Mastery rings for every skill so you always know where you stand • Session summaries that show exactly what you missed • Per-skill stats and accuracy trends over time DESIGNED TO BE FAST AND FOCUSED • Procedurally generated exercises — practice never runs out • Multiple-choice and tap-the-piano answers • Instant grading with gentle haptics and optional auto-advance PRIVACY FIRST Interval works entirely on your device. There's no account, no tracking, and no data collection. Your practice stays yours. ONE-TIME PURCHASE Buy once and own it — everything is included. No subscriptions, ever. Perfect for music students, self-learners, and teachers who want a reliable, affordable way to master the fundamentals.