Protect Your Eyes While You Browse
Thrifle’s Blue Light Filter warms your screen at night to reduce eye strain and support better sleep — works on any theme, no extra app needed.
What Is Blue Light?
Blue light is a portion of the visible light spectrum with wavelengths between roughly 380 and 500 nanometers. It is emitted in large amounts by LED screens — including your phone, tablet, and computer monitor. During daylight hours, blue light helps keep you alert and regulates your body clock. At night, however, the same wavelengths can interfere with the natural processes your brain uses to wind down.
Most modern screens are optimised for daytime brightness, which means they emit far more blue light than our eyes are designed to handle after sunset. A software filter that shifts the colour temperature of your display toward warmer amber tones is a simple, proven way to reduce that exposure without changing layouts or readability.
How It Affects Your Sleep
When light hits the retina in the evening, the brain’s suprachiasmatic nucleus interprets it as a signal that it’s still daytime. This suppresses the release of melatonin — the hormone that makes you feel sleepy. Blue wavelengths are especially effective at this suppression, meaning a couple of hours of screen time before bed can delay melatonin release by up to 90 minutes according to multiple sleep research studies.
Shifting to a warmer colour temperature in the evening lets your circadian rhythm proceed as it should, making it easier to fall asleep at your intended time and improving overall sleep quality. Even a modest reduction — 30–50% blue light filtering — can make a noticeable difference within a few days of consistent use.
How to Use Thrifle’s Blue Light Filter
Click the ☀ / ☮ icon in the top-right navigation bar. Right-click (or long-press on mobile) to open the full Blue Light Filter panel.
Drag the “Blue Light Filter” slider to your preferred level. 50% is a good starting point — zero means no filter, 100% applies maximum amber warmth. Your setting is remembered until the next day.
Optionally enable Auto mode — the filter activates automatically at sunset and turns off at sunrise. Grant location permission for precise timing, or it defaults to 9 PM–7 AM.
Auto Mode + Location
When Auto mode is on, Thrifle uses your latitude and longitude to calculate the exact local sunset and sunrise times each day. The filter turns on at sunset and off at sunrise — no manual toggling needed. If you decline location permission, Auto mode falls back to a conservative 9 PM–7 AM window that works well for most North American time zones. Your location data is stored only in your browser and is never sent to Thrifle’s servers.
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