ScreenTime Blue Blocking Screen Filter — iPhone
Adhesive screen filter that physically blocks blue and green light from your iPhone display — for evening use without dimming distortion.
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The cheapest circadian upgrade on this list. An adhesive filter that physically blocks blue and green light at the screen, so late-night phone use does less to your melatonin — without the colour-shifted dimming of software night modes. It only covers one device, but it's a genuinely passive fix.
Anyone who scrolls in bed and wants a set-and-forget block that doesn't rely on remembering to wear glasses.
People who need whole-environment control — a filter on one phone won't touch laptops, TVs or overhead lighting.
Where this product sits on the light × performance spectrum