Unified brightness, warmth & break reminders.
One app to protect your eyes, day and night.
One slider controls native macOS brightness and gamma dimming seamlessly. Go beyond what your display allows — down to pitch black.
Shift your screen to warmer tones at night. Dimly reduces blue light in the 446-477nm range — the wavelength most responsible for melatonin suppression.
Smart 20-20-20 reminders that detect your activity. Pauses during meetings, adapts to your workflow. Benefits vanish without consistent reminders — Dimly keeps you on track.
Toggle system-wide grayscale to reduce visual stimulation. Removes the colorful cues that trigger dopamine and keep you glued to your screen.
Every feature in Dimly is grounded in peer-reviewed research. Here's what the evidence says.
Research using EEG and eye-tracking shows that low screen brightness significantly reduces visual fatigue in dark environments. Meanwhile, bright screens provoke headaches in 29% of chronic sufferers and aggravate them in 73%.
Blue light (446-477nm) is the strongest melatonin suppressor. Harvard researchers found it suppresses melatonin twice as long as green light and shifts your circadian rhythm by 3 hours. Just 2 hours before bed reduces melatonin by ~50%. Warmer color temperatures let your body prepare for sleep naturally.
Clinical trials show the 20-20-20 rule reduces dry eye symptoms and digital eye strain. But the benefits disappear within one week of stopping. Only 34% of people actually practice it. Automated reminders are the only reliable way to build the habit.
Grayscale eliminates the colorful visual cues that trigger dopamine and fuel app addiction. Studies show it reduces daily screen time by 38-50 minutes — more effective than active self-control. Participants reported better sleep, improved focus, and reduced anxiety.
Download Dimly, drag to Applications. It lives in your menu bar — always one click away.
Set your preferred brightness, warmth, and break intervals. Dimly remembers your settings across sessions.
Dimly runs quietly in the background. Automatic scheduling, smart break detection, and keyboard shortcut support.
Full access to all features.
No credit card, no commitment.
macOS 13+ · Apple Silicon & Intel
Pay once, use forever.
All future updates included.
2 Mac activations · Lifetime updates