Comment by scorpio241

Not used anywhere? E.g. Affinity Photo has support for JPEG XL, but not for AVIF. Not used in browsers because they are nearly controlled by Chromium, which is clearly biased toward AVIF. https://en.wikipedia.org/wiki/JPEG_XL#Official_support Official support:

    Squoosh – In-browser image converter[42]
    Adobe Camera Raw – Adobe Photoshop's import/export for digital camera images[43]
    Affinity Photo – raster graphics editor[44]
    Chasys Draw IES – raster graphics editor[45]
    Darktable – raw photo management application[46]
    ExifTool – metadata editor[47]
    FFmpeg – multimedia framework, via libjxl[48]
    GIMP – raster graphics editor[49]
    gThumb – image viewer and photo management application for Linux[50]
    ImageMagick – toolkit for raster graphics processing[51]
    IrfanView – image viewer and editor for Windows[52]
    KaOS – Linux distribution[53]
    Krita – raster graphics editor[54][55]
    libvips – image processing library[56][57]
    vipsdisp – high-performance ultra-high-resolution image viewer for Linux[58]
    Qt and KDE apps – via KImageFormats[59]
    XnView MP – viewer and editor of raster graphics[60]
    Pale Moon – web browser[61]