GramFrame Optimised Demo Gram 9KB

Why this gram exists: the release archive was 561KB, and 86% of that was a single photographic sample spectrogram included only so the demo page rendered. A zip cannot compress an already-compressed PNG, so that image was effectively the whole download. The gram below is drawn instead of photographed — same analytical features, a fraction of the bytes.

	Demo gram	Release archive
Before	481,868 bytes	561,165 bytes
After	9,038 bytes	87,625 bytes
Saving	−98%	−84%

What to try — every mode has something drawn for it:

• Harmonics — the evenly spaced stack of eight tonals, fundamental at 6 Hz
• Sidebands — the tight triple at 33.5 Hz: a carrier with a sideband either side, 1.2 Hz out
• Doppler — the S-curve near 20 Hz, shifting through its inflection at t = 5 s
• Cross Cursor — the two short isolated tonals: 44.2 Hz early on, 11.0 Hz later
• Pan — zoom in, then drag; the two broadband transients at t = 3.1 s and 7.6 s cross the full band

Note: this page has no “ANALYSIS” link, so it runs in the student context — annotations use sessionStorage and are cleared when the browser closes. The trainer page shows the persistent variant.