Observed arrival · 2026-10-13
Earstep turns piano intervals into harmonograph figures
An ear-training demo plays piano sounds for you to identify, then pairs each interval with a figure based on its frequency ratio.
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●Pro
◎Niche
◉Human
⚑Risk
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- For
- Musicians practicing interval and chord recognition
- Worth noticing
- The page notes that its piano’s major third sits 14 cents wider than the simple 5:4 ratio.
Field notes
The visible exercise is level 3 of a rising-interval sequence and offers four answer choices before a “Hear both” control. The page explains the shapes through harmonograph pendulums, then contrasts simple ratios with piano tuning: its examples put the fifth 2 cents narrow and the major third 14 cents wide. It also says 14 of 56 levels are free; the supplied extract does not establish the price or access terms for the rest.
Observed signals
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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