Everything runs in your browser; nothing is uploaded. Start with a bundled pair:
For each image, drop a file on its box, choose one, or enter a URL. OME-Zarr (a
.ome.zarr URL or a zipped .ozx), TIFF and OME-TIFF, and any format ITK reads
(NIfTI, NRRD, MetaImage, DICOM, PNG, …). Both images must be 2D or both 3D.