Quick answerYour operating system already has settings that make a screen calmer: dimmer-than-minimum options like Reduce White Point, warm-light modes like Night Shift and Night light, reduced motion and HDR brightness balance. Here are the documented steps for each platform, with sources from Apple, Google and Microsoft.
Migraine Mode for Chrome – one switch applies a preset based on published studies to every tab (Alt+Shift+M). Try it 1 hour free, then $3/month.
FAQ
Can software lower my screen below its minimum brightness?
Some systems can: iPhone's Reduce White Point lowers the intensity of bright colors, and browser filters can dim web pages further.
Not a medical device and not medical advice. Migraine Mode is a screen-comfort tool: it does not diagnose, treat, cure or prevent migraine or any other condition, and it does not replace a doctor. Its settings are based on studies of light, colour, flicker, patterns and motion; the extension itself has not been clinically tested. When to see a doctor.