A free dark mode timer for night study, late work, and low-light rooms. Press D or tap the moon icon and the interface switches to a warm near-black background with soft off-white digits — no glare, no ads, and no bright white panel sitting in your peripheral vision for the next hour.
Polytimer's dark theme uses #131311 — a warm near-black — with off-white text, rather than pure #000000 on pure #FFFFFF. Maximum contrast is not the same as maximum comfort: pure white text on pure black tends to produce halation, the smeary glow around letterforms that makes long reading sessions tiring, and it is especially noticeable with large digits. Pulling both ends slightly toward the middle keeps the countdown crisp without that effect.
The accent green and the alert colours are also re-tuned for the dark palette rather than reused from light mode, so a Pomodoro phase change or an expired timer still reads clearly without glowing against the background.
A timer is a long-dwell interface. You are not reading it and moving on — you set it precisely so you can stop thinking about time, and then it stays on screen for the whole session. In a dim room that makes a light-mode timer the brightest object in your field of view for 25, 45, or 90 minutes at a stretch. Dark mode matters more here than on a page you glance at once.
Dark mode plus fullscreen gives you a near-black display showing only the countdown. Useful for:
On OLED displays — most recent phones and some laptops — each black pixel is genuinely off rather than backlit, so a near-black timer left running for an hour draws measurably less power than a white one. If you use an old phone as a permanent desk timer, dark mode plus fullscreen is the configuration that will survive the longest on a charge. On LCD panels the backlight stays on regardless, so there dark mode is purely about eye comfort.
Press D, or tap the moon icon in the top-right of the timer. Your choice is saved in your browser, so Polytimer opens in dark mode on that device from then on. Press D again to switch back.
For a timer, yes — you leave it on screen for the whole session, so in a dark room it becomes the brightest thing in your peripheral vision. Polytimer uses warm near-black with off-white text rather than pure black on pure white, which avoids the halation that makes maximum-contrast themes tiring.
Yes — switch to dark mode and press Fullscreen. The display becomes a near-black screen with nothing but the countdown digits: no navigation, no page content, no browser chrome. It works well as a bedside or overnight timer.
Polytimer opens in light mode by default and remembers whichever theme you last chose on that device. Toggling takes one key press and persists, so you set it once — deliberate, since a projector or classroom display often needs the opposite theme to the laptop driving it.
On OLED screens — most recent phones and some laptops — yes, since black pixels are switched off rather than backlit. On LCD screens the backlight stays on regardless, so there dark mode is about comfort rather than battery.
Yes — countdown, stopwatch, Pomodoro, and the multi-timer grid, plus fullscreen and Picture-in-Picture. Every page on the site uses the same theme, so it stays consistent as you move between them.