Crux: Interval & HIIT Timer

Crux is a clean, no-nonsense interval timer for HIIT, Tabata, CrossFit and circuit training. Build a workout once, then just train—every phase change is impossible to miss. WHY CRUX • Huge, high-contrast display you can read from across the room, mid-burpee. • Each phase has its own color—prep, work, rest—so you always know what's now and what's next. • A progress background drains as time runs out. No squinting at tiny numbers. BUILT FOR REAL WORKOUTS • Prep, work, rest and cycles—set them all with fast +/− steppers or type the time on the keypad. • Sets with a long rest between blocks: repeat the same block of cycles several times with a break in between, no manual restarts. • Quick templates to start a classic Tabata or EMOM in seconds. • A summary shows the total duration before you start. WHAT YOU CAN TIME • HIIT, Tabata and home cardio, no equipment needed. • AMRAP and EMOM for your CrossFit WOD. • Boxing, muay thai and sparring rounds, with rest between rounds. • Sets and reps at the gym: control your rest between sets instead of watching the clock. • Planks, core and ab work for time. • Stretching, mobility and yoga, with a countdown for each pose. • Running, cycling and rowing intervals. • Any gym or home routine that needs a round timer or a countdown timer. YOUR WORKOUT LIBRARY • Save each workout with a name and reuse it in a tap. • Pin the ones you repeat most to the top; the rest stay in alphabetical order and never reshuffle on their own. • Duplicate and edit to build variants in seconds. Deleted one by mistake? Undo it. YOUR HISTORY • Every workout is logged automatically—nothing to write down. • See what you did and when, with the real duration of each session. • Tell completed sessions from interrupted ones at a glance. • Count how many sessions you've done this week and this month. KEEPS GOING WHEN YOU DON'T LOOK • Sound and vibration cue every phase change—loud, gym-ready alerts. • Works with the screen off or another app open. A notification tracks the live phase. • Lock the screen with hold-to-unlock, so a stray touch never stops your set. • A dedicated bell marks the end of the session. MADE TO LAST • Portrait and landscape—prop your phone anywhere. • Light and dark themes. • Available in English, Spanish, German, French, Italian and Portuguese. • No account, no sign-up. Just a timer that works. Crux. Find your hardest move and time it.