Yeah, screens always mess with colors. I make sure to set my files to sRGB before exporting, since that's what most sites use. Also, I preview the image on my phone and laptop to catch any big shifts. Adjusting my monitor often keeps things looking close to what I intended.
Ugh, tell me about it. I swear my monitor is lying to me on purpose. I do the sRGB thing too, but sometimes the colors still look totally different on my phone. Do you ever just give up and tweak it until it looks okay on both, even if it's not perfect anymore?