Counting and targets
Each tap adds one to the counter you have selected. With a target set, the line under the button shows how far you are in the current round, such as 12 of 33, and how many rounds you have completed. When a round is complete, the button flashes and, on phones that support it, vibrates twice, and counting simply carries on into the next round, so a target of 33 lets you count three rounds of 33 without resetting. Choose No target to count freely. Undo 1 takes back an accidental tap.
Several counters, saved on your device
You can keep up to 20 counters, each with its own name, count and target, and switch between them from the list. Names are whatever you type; the page shows no dhikr wording of its own. Counts are saved in your browser’s local storage on this device as you go, so they are still there if you close the tab or restart the phone. They are not sent anywhere and do not move to your other devices, and clearing your browsing data or using a private window removes them. Reset sets the selected counter to zero after you confirm.
Vibration, keyboard and full screen
Vibration uses the browser’s Vibration API. MDN notes that it does not work in some widely used browsers, that it needs you to have interacted with the page, and that silent or do-not-disturb mode can stop the device vibrating, so watch for the flash on the button as well. On a computer, the space bar and Enter key count whenever you are not typing in a field. Dark full screen hides everything except the counter on a black background, which is easier on the eyes at night; press the button again or Escape to leave it.
Beads or a screen: practical differences
A string of beads needs no battery, makes no light and lets you keep your eyes closed, while a screen counter keeps an exact total, remembers several counts at once and shows how many rounds you have finished. Many people use both: beads in the mosque or on a walk, the phone when they want a running total for a long count. Neither changes what you recite; this page only helps you keep the number.
What this counter is, and is not
This is a counting aid for your own dhikr. It does not show any words to recite, and it does not give rulings on which adhkar to say, how many times or when; numbers such as 33 are offered only as common round sizes for counting. For those questions, ask a scholar, a teacher or your local mosque.