TailShader is a local HTML program for fast generation of color duplicates of images.
You upload an image via drag & drop, Ctrl+V, or file selection, set the number of options, and TailShader creates a set of PNGs in different shades. There are grid previews, Photoshop-like overlay modes, lasso/rectangle/circle selection, pixel grid zooming, frames, and custom PNG frames.
At the exit, you can download a ZIP with all the images, as well as automatically get a collage of all the options and immediately copy it to the clipboard for sharing.
It works directly in the browser, without installation and without uploading files to the server.