Tonika | Music Theory Drills

Tonika is a retrieval-repetition drill built for one purpose: memorizing "the dominant," the foundation of chord theory. ■ What this app is ・Repeats one thing, over and over: recalling the dominant of each key. ・Major and minor keys with the same tonic share the same dominant root — so there are really only 15 to memorize. ・If that's true, memorizing first beats understanding first. That's the whole idea behind this app. ■ Let's be upfront This isn't a gentle app that explains terms from scratch. If you're wondering "what even is a dominant?" — look it up online first, then come back. What we did put real effort into is the system for making it stick. ■ Built on memory science ・Knowledge you just read fades fast. But every time you recall it, the memory gets stronger — that's retrieval practice. ・Keys you get wrong are flagged as "weak" and served more often in Review mode. Get them right, and the weak count drops. ・The Circle of Fifths Mastery Map shows at a glance which keys you've locked in. ■ Built to stick with ・Quick Mode: 10 questions per round, perfect for a commute or a practice break. ・Choose your own range — grind through every key the slow way, or laser-focus on your weak spots. ・Available in Japanese, English, Korean, and Chinese (Simplified). ・Fully offline. No sign-up, no ads. ■ Who it's for ・Guitarists, bassists, and keyboard players stuck at the chord-theory doorway. ・Anyone who wants "dominant motion" to be reflex, not something they think through. ・Anyone who's read music theory books over and over and it still won't stick — that's not a comprehension problem, it's a repetition problem. Train your theory reflexes.