Event Horizon Timer

The timer that devours your desktop. Focus quietly, then let a black hole prompt your rest.

Preparing for the Mac App Store.

Gargantua style in the app preview, with a bright accretion disc bending the live desktop around a black hole — Gargantua bending the live desktop. Actual app preview; select any screenshot to view it at full size.

Start a focus cycle

Open the timer from the menu bar or Dock, set work, growth, and shrinking durations, then start. Defaults are 25 minutes of work followed by a 5-minute rest: 3 minutes of growth and 2 minutes of shrinking. Both growth and shrinking count as rest, without taking time from work.

The actual focus timer window with a countdown and adjustable work, growth, and shrinking durations — The timer and its settings. Custom durations are included in the free version.

What is free

The complete timer, custom work and rest durations, Inferno and Gargantua styles, live desktop lensing, today’s statistics, science content, shortcuts, sound cues, and general settings are free. All nine styles appear in preview; the other seven have a gray lock overlay. Preview parameters remain visible but are read-only in the free version.

Pure Lens style in the actual app preview, distorting the desktop around a dark black hole — Pure Lens, one of the additional styles unlocked with Pro.

Pro and Restore purchases

Pro is an optional one-time purchase, with no subscription. It unlocks all nine styles, editable preview parameters, and historical statistics. The regional price is shown by the App Store. Sign in with the Apple Account used to purchase Pro, open Upgrade to Pro in the app, and choose Restore purchases. If restoration fails, check your App Store account and network connection, then try again. Apple handles payments and refunds.

The actual Pro window listing all styles, preview adjustments, historical statistics, and Restore purchases — The Pro window. The price in this capture is an example; your App Store shows the current regional price.

Explore black holes

Six interactive experiments explore light paths, accretion discs, time dilation, and other black-hole physics. The bilingual science pages are included for free and work offline.

The actual science page showing an accretion-disc experiment beside a comparison of clocks near a black hole and at infinity — Explore the light from an accretion disc and compare how clocks tick at different distances.

System requirements and performance

Requires macOS 26 or later and a Metal-capable Mac. Adjust render quality in settings if needed. Screen-recording permission is only used for desktop lensing; declining it does not prevent basic timing.