Perimeter: Screen Glow Timer

Ambient deadline awareness

Only for Mac

Free · In‑App Purchases

Mac

Perimeter wraps your screen in a glowing border that intensifies as your next meeting approaches. At a glance, you know exactly how much time you have — no checking clocks, no app switching, no surprise "you're late" moments. HOW IT WORKS A subtle glow appears around your screen edge when an event is approaching. At a half hour out, it's calm and narrow. As time ticks down, the glow grows wider, brighter, and more urgent — from a soft green to amber to orange to a blazing red. CALENDAR MODE (Pro) Assign a distinct color to each calendar. Your work calendar glows blue, personal glows green, health glows purple. You instantly know which calendar needs your attention — while urgency still shows through the glow's size and intensity. PATTERNS & ANIMATIONS Choose from 10+ glow styles: Gradient, Comet, Wave, Marquee, Corners, Segments, Dot & Dash, and more. Each pattern supports Breathe and Pulse animations for just the right vibe. BUILT FOR PROFESSIONALS • Unlimited calendars and reminders • Per-event overrides — set a custom glow for important meetings • Multi-monitor support — extend the glow to every screen • 5-level urgency timing with fully adjustable timing • Quick Add — create events directly from the menu bar • Monthly pattern drops — new styles added regularly FREE TO USE Perimeter works free forever with a solid glow on your primary calendar. Upgrade to Pro for the full pattern library, Calendar Mode, multi-monitor, reminders, and more. PRICING • Free — Solid glow, 1 calendar, primary monitor • Pro — $9.99/year with a 2-week free trial • Lifetime — $39.99 one-time purchase, unlock everything forever Perimeter lives in your menu bar and uses minimal system resources. It reads your calendars locally — nothing leaves your Mac. -- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula Privacy Policy: https://mightypickle.dev/perimeter/privacy

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• Reminders now stay glowing through their due time instead of disappearing the instant they fire. • Smoother glow recovery on external monitors when your Mac wakes from sleep. • Fewer permission prompts on first launch. • Refined timing preferences — type exact threshold values and reset urgency settings in one tap. • Dismiss card polish and general stability improvements.

Version 1.0.3

The developer, Matthew Schwartz, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Matthew Schwartz
    Size
    • 1.5 MB
    Category
    • Productivity
    Compatibility
    Requires macOS 14.0 or later.
    • Mac
      Requires macOS 14.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    • Perimeter Pro — Annual $9.99
    • Perimeter Pro Lifetime $39.99
    • Learn More
    Copyright
    • © 2026
  • Developer Website
  • Privacy Policy

    • More by Matthew Schwartz