A flip cube with 5, 10, 30 and 60 minute presets plus custom countdowns, silent vibrate, three alarms, a stopwatch and a clock.
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The TK3 is the configurable flip cube. It keeps the turn-it-over start but its listed presets are 5, 10, 30 and 60 minutes, and it adds fully custom countdown durations, a stopwatch, a clock display, three alarms, and a choice of silent vibrate or sound alerts. Those additions answer three specific situations. Custom durations suit people whose sessions are 40 or 90 minutes rather than 25. Vibrate-only makes it usable in a library, a classroom or a shared office where an audible alarm is disruptive. And the clock mode removes one of the most common reasons a phone stays face-up on the desk: needing to know the time. Compared with the fixed-preset KADAMS cube, the trade is immediacy for flexibility. More modes mean more buttons, so setting an unusual duration takes a few seconds rather than one movement. If your rhythm never changes, the simpler cube is faster; if it does, this one is the only one of the two that adapts.
HOS lists it because it collapses the desk clock, the stopwatch and the focus timer into one object, removing three separate reasons the phone stays within reach during focused work.
Libraries, classrooms and shared offices, and anyone whose focus blocks are not a standard 25 minutes.
More modes mean more buttons, so it is slightly less immediate than a fixed-preset cube and takes a moment to learn. Its preset faces are 5, 10, 30 and 60 minutes, so the classic 25 minute Pomodoro has to be set as a custom duration. Vibration strength depends on the surface it sits on.
HOS selected this product based on its stated features, practical relevance, availability, and fit with this category. This is not a hands-on review unless explicitly labeled as one.
Product details verified 2026-08-04.
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The standard visual countdown timer, showing remaining time as a shrinking red disc.
Best for: Classrooms, homework sessions, and children who respond better to a visual than to numbers.
A fixed-interval Pomodoro cube: 5, 10, 25 and 50 minutes, no custom durations, no clock, no menus.
Best for: People running a standard 25 minute Pomodoro rhythm who want the simplest possible object and no settings to manage.
A magnetic dry-erase weekly planner for the fridge, with markers and eraser included.
Best for: Households coordinating meals, chores, and schedules without everyone needing a device.