If you can see a variation between the colors of your images from your computer and Pixieset, or from Pixieset to your Mobile Device, this usually means that your images have been saved in the incorrect color space.
We recommend that you save your images in the sRGB color space because sRGB can be fully supported across all devices and printers. Any color spaces above sRGB (RGB, AdobeRGB, or ProPhotoRGB) are very large color spaces, and unfortunately are not fully supported by most systems.
When exporting your images from Lightroom, be sure to check that your Export Settings are set to the sRGB color space.
When working and saving in Photoshop, you will also want to be sure that your color settings are set to sRGB.
If your images are in the sRGB color space, and you are still experiencing colour variation between your desktop and mobile Collections views, contact Pixieset Support at firstname.lastname@example.org.