Crux: Interval & HIIT Timer

Jormagu

Contains ads

About this app

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.

What’s new

New: workout history.
• New "History" tab: every session you complete or interrupt is saved.
• Search by name and filter by 7 days, 30 days or 3 months; the top shows how many sessions you've done this week and this month.
• Delete a single session or clear the whole history.
• In Workouts, star your favorites and they'll always stay at the top.
• When adjusting times, the value changes on release, not on touch.