Mesh Gradient
Flowing colour spots under swirl and noise
Four soft colour spots drift on slow orbits and melt into one another, with a swirl at the centre that fades toward the edges and a gentle bend over the whole frame. The midpoints stay vivid instead of greying out. The default for marketing surfaces and card backgrounds.
Rendering cost: light. A few samples per pixel: fine fullscreen at full pixel ratio, including on integrated graphics. How to tune it
Take Mesh Gradient with you.
Mesh Gradient is free. Sign in and it is yours — the background itself, with your settings already saved in, ready to drop into your site. The account is only somewhere to put the files. No card now, and no card later.
The other 61 come with a licence, $9.99 once.
$0forever
Your preset is in the URL. It survives the trip.