Digital tasbeeh counter

It is any electronic aid that keeps the tally of dhikr. The handheld version is a button and an LCD digit wheel, often worn as a ring. The browser version does the same counting with a much larger display, an undo, a target and a count that is saved rather than lost when the battery dies.

Yes, according to scholars across the major schools. The Prophet ﷺ counted on his fingers and did not object to companions counting on pebbles and date stones. A counter is an aid, not an act of worship, so it takes the ruling of the practice it serves.

The only caution scholars raise is one of attitude: do not let the device become the point, and do not treat it as more virtuous than the fingers, which are the sunnah.

A ring counter is discreet and needs no screen, which some people prefer during a lecture or in a queue. A phone counter is larger, cannot be pressed by accident inside a pocket, shows the Arabic and the transliteration, and keeps a target. Many people use both, the ring in public and the phone at home.