Observed arrival · 2026-10-27
Accidentals: a configurable music-theory drill
A free music-theory practice tool for accidentals, key signatures, scales, intervals, and chords, with quizzes and flashcards.
○Open
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Musicians practicing key signatures and theory
- Worth noticing
- Rounds can be narrowed by sharp or flat keys, selected key count, scale degree, chord type, and minor form.
Field notes
The visible practice controls can limit a round to sharp keys, flat keys, or both; users can choose one, two, four, or all 15 keys and set the sequence to ordered or shuffled. Further controls cover scale degrees, chord types, and natural, harmonic, or melodic minor forms. The page says Google ads appear between rounds and offers an ads-consent choice.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
†AdsAdvertising visible
◎NicheUnusually specific use
One card from the complete issue