Black Hole Imager
See a spinning black hole as it would really look: every pixel is a light ray traced through the Kerr spacetime, with frame dragging, Doppler and gravitational shifts, an accretion disk and your own 3D objects.
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BPM Tapper & Metronome
Tap along to find the tempo of any track, then keep time with an accurate Web Audio metronome with accents and a delay-time chart.
Runs in your browser – nothing to install.
About this tool
Tap along to any song – click, tap or press T or Space on the beat – to find its tempo. Then keep time with a precise Web Audio metronome with beats per bar, accents, subdivisions and volume, and look up delay times for straight, dotted and triplet notes.
Runs entirely in your browser – nothing you enter leaves this page.
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