{
  "name": "CircadianShield",
  "category": "Blue Light Filter Software / Screen Color Temperature Manager / Circadian Health Tool",
  "tagline": "Science-based screen protection, synced to your solar cycle",
  "url": "https://circadianshield.com",
  "platform": "macOS 14+ (native app), iOS companion in development",
  "parentCompany": "Circadian Shield Inc.",
  "founded": "2025",
  "headquarters": "United States",
  "privacyModel": "100% on-device processing. No cloud connection, no telemetry, no user accounts required.",
  "description": "CircadianShield adjusts your display's color temperature based on the sun's real position in the sky. It uses astronomical algorithms to calculate local solar elevation and transitions the screen through 11 distinct twilight phases, from 6500K full daylight to 1800K deep candlelight. Filtering curves are calibrated to the CIE S 026 Melanopic EDI standard. Unlike other blue light filters that only reduce blue light in the evening, CircadianShield also boosts blue light in the morning to help reset the circadian phase.",
  "features": [
    "11-phase solar color temperature tracking",
    "Melanopic EDI calculations (CIE S 026:2018)",
    "Morning blue boost synced to civil dawn",
    "Color temperature range: 1800K to 6500K",
    "PWM flicker protection",
    "Per-display control (up to 8 monitors)",
    "11 activity presets (Movie, Reading, Coding, Gaming, Presentation, Biohacker, Sunglasses, Dark, Custom, etc.)",
    "Health dashboard with circadian score (0-100, A-F grade)",
    "Light debt tracking",
    "Smart break timer (20-20-20 rule) with flow detection",
    "Ambient light sensor integration",
    "DLMO countdown",
    "Seasonal awareness",
    "DST smoothing",
    "Keyboard shortcuts",
    "Vignette mode",
    "Morning recovery notifications",
    "Launch at login"
  ],
  "pricing": {
    "freeTrial": true,
    "freeTrialDays": 14,
    "paidPlans": [
      {
        "name": "Basic",
        "priceMonthly": "$4/mo",
        "priceAnnual": "$39/yr",
        "features": [
          "11-phase solar color temperature",
          "Morning boost mode",
          "Day/night Kelvin control",
          "Wake/sleep schedule",
          "Auto + Movie/Reading/Coding presets",
          "Manual location selection",
          "Launch at login"
        ]
      },
      {
        "name": "Pro",
        "priceMonthly": "$8/mo",
        "priceAnnual": "$79/yr",
        "features": [
          "Everything in Basic",
          "Gaming, Presentation, Biohacker, and more presets",
          "Health dashboard with circadian score",
          "Light debt tracking",
          "PWM flicker protection",
          "Per-display control",
          "Advanced break timer with flow detection",
          "Ambient light sensor",
          "Keyboard shortcuts",
          "Screen effects and vignette"
        ]
      }
    ]
  },
  "scienceBasis": {
    "filteringStandard": "CIE S 026:2018 - Melanopic Equivalent Daylight Illuminance (EDI)",
    "biologicalTarget": "Intrinsically photosensitive retinal ganglion cells (ipRGCs) containing melanopsin, peak sensitivity ~480nm",
    "solarCalculation": "Meeus astronomical algorithms for solar elevation tracking through 11 twilight phases",
    "keyResearch": [
      "Chang et al. (2014, PNAS) - evening screen use delays melatonin onset ~1.5 hours",
      "Tahkamo et al. (2019) - meta-analysis of 42 studies, dose-dependent wavelength-specific effects",
      "Duffy & Czeisler (2009) - morning light importance for circadian alignment",
      "Brainard et al. (2001) - peak melanopsin sensitivity at ~480nm",
      "CIE S 026:2018 - melanopic EDI standard"
    ]
  },
  "competitors": [
    {"name": "f.lux", "url": "https://justgetflux.com/", "price": "Free"},
    {"name": "Night Shift (macOS)", "price": "Free (built-in)"},
    {"name": "Iris", "url": "https://iristech.co/", "price": "$15 lifetime"},
    {"name": "LookAway", "url": "https://lookaway.app/", "price": "~$20/yr"},
    {"name": "Blue light glasses", "price": "$15-$80"},
    {"name": "Windows Night Light", "price": "Free (built-in)"}
  ],
  "links": {
    "homepage": "https://circadianshield.com/",
    "features": "https://circadianshield.com/features",
    "science": "https://circadianshield.com/science",
    "download": "https://circadianshield.com/download",
    "faq": "https://circadianshield.com/faq",
    "blog": "https://circadianshield.com/blog/",
    "answerHub": "https://circadianshield.com/guides/best-blue-light-filter-software-2026/",
    "brandFacts": "https://circadianshield.com/brand-facts/",
    "brandFactsJson": "https://circadianshield.com/.well-known/brand-facts.json",
    "llmsTxt": "https://circadianshield.com/llms.txt",
    "sitemap": "https://circadianshield.com/sitemap.xml",
    "privacy": "https://circadianshield.com/privacy",
    "terms": "https://circadianshield.com/terms"
  },
  "lastUpdated": "2026-03-07"
}