screen-filters
Iris Pro
Iris is the most advanced blue light filtering software available, going beyond simple color shifting to address Pulse Width Modulation (PWM) flicker. It allows for granular control over color temperature and brightness without increasing screen flicker.
Quality & Materials
Software-based solution that manipulates the video card's LUT (Look Up Table) to eliminate blue light and control brightness via software rather than hardware PWM.
Evidence & Testing
Built on established circadian biology research regarding the impact of 450-480nm light on melanopsin suppression.
Brand Transparency
The developer is highly active in the biohacking and health community, providing extensive documentation on the physics of light and screen technology.
Value Assessment
A one-time purchase of $15 is exceptional value considering it can be used across multiple devices to protect circadian health indefinitely.
Why Not Alternatives?
While f.lux is excellent for basic shifting, Iris is the only solution that addresses PWM flicker, which is a major cause of eye strain and headaches for many users. It offers far more customization than built-in OS filters like Night Shift.
Sources & References
More in Circadian & Light
Ra Optics
Sunset Lenses (Clyde Frame)
Ra Optics is the industry leader in precision optics for circadian health, utilizing proprietary pigments that provide a sharp 550nm cutoff. Unlike most competitors, they use high-quality CR-39 plastic lenses which offer superior optical clarity compared to cheap polycarbonate.
Bon Charge
Sleep Blue Light Blocking Glasses
Bon Charge (formerly BluBlox) offers laboratory-tested lenses that block 100% of the blue and green light spectrum from 400nm to 550nm. Their frames are exceptionally high quality, and they offer prescription, reading, and non-prescription options.
BlockBlueLight
NightLens Blue Light Blocking Glasses
BlockBlueLight offers the best balance of clinical-grade spectrum accuracy and affordability. Their NightLens is specifically designed to block 100% of blue and green light up to 550nm, backed by accessible spectral analysis reports.
Swanwick
Classic Night Swannies
Swanwick is the brand that popularized blue blockers for sleep. Their orange 'Swannies' are effective at blocking blue light and are a reliable, well-reviewed entry point for those new to circadian optimization.