Download

Get CircadianShield

Buy Core for PWM dimming and warmth, or Pro for the full solar product. Same app on Mac and Windows. One-time payment, up to 2 computers. 7-day free trial on Mac and Windows, card required.

macOS

Version 1.2.0 · 63 MB

Start 7-day Core trial Start 7-day Pro trial

Or pay now: Core $27 · Pro $47

What you get

  • Core: warmth and PWM dim on this Mac right after you paste the key
  • Pro: the full solar product on the same app, same 2-computer license
  • License key and download link arrive by email right after purchase
  • Notarized by Apple

System Requirements

  • macOS 14.0 (Sonoma) or later
  • Apple Silicon (M1/M2/M3/M4) or Intel
  • 64 MB RAM · 75 MB disk space

Windows

Version 1.2.232.1 · 11 MB

Buy Core, $27 Buy Pro, $47

The 7-day trial works on Windows too: start a Core trial or a Pro trial.

What you get

  • Core: warmth and PWM dim on this PC right after you paste the key
  • Pro: Dashboard, Health, and solar on the same app
  • License key and download link arrive by email right after purchase
  • Signed x64 installer

System Requirements

  • Windows 10 or later
  • x64 processor
  • 64 MB RAM
  • 25 MB disk space
Installation

Up and running in 3 steps

1

Download & Open

Download the installer for your platform and open it. On macOS, drag CircadianShield to Applications. On Windows, run the setup file.

2

Grant Permissions

On first launch, allow Accessibility access so CircadianShield can apply the display overlay.

3

Set Location

Choose a city preset or auto-detect your coordinates. CircadianShield starts adjusting your display immediately.

Pricing

Choose your plan

Two one-time purchases. Same license on Mac and Windows. Core owners can upgrade in the app for $20.

Core

PWM dimming and warmth. The flicker fix.

$27 one-time

Up to 2 computers. Upgrade to Pro later for $20 in the app.

Includes

  • PWM software dimming (hardware stays at 100%)
  • Screen warmth / red
  • Launch at login
  • Mac and Windows

Pro

The full CircadianShield product

$47 one-time

One payment covers up to 2 computers. No subscription.

Cancel before day 8 and you will not be charged. The trial key then stops working.

Includes

  • Everything in Core
  • Solar schedule, Comfort Studio, Progress
  • Health dashboard and light debt
  • Eye breaks, per-display profiles, shortcuts

7-day trial on Mac and Windows. Cancel before day 8: no charge, and the key stops working. Contact support