HelioFITS

Solar FITS files, rendered as the Sun: in the right instrument colormap, with real coordinates, right where your data already lives.

Get it on the Mac App StoreFree · macOS

Source on GitHub HelioFITS Studio

Thumbnails on every .fits icon
Press Space for an interactive preview: pixel values, coordinates, region stats
Telescope, instrument and wavelength searchable in Spotlight
A viewer with the full header and a ready-to-run sunpy snippet

Free and open source · no account · no network access

HelioFITS previews solar FITS files in Finder and Quick Look. HelioFITS Studio is the full desktop application for working with coronagraph and wide-field solar imagery.