Round Zero: HIIT Interval

Round Zero is a fast, focused interval timer for HIIT, Tabata, EMOM, circuit training and boxing rounds.

Buy it once. No ads, no subscription, no account. Ever.

BUILT FOR REAL TRAINING
Most free timers interrupt your session with a video ad between rounds. Round Zero never will. You pay once and the app is yours.

EVERYTHING YOU NEED
• Custom work and rest intervals, from 5 seconds to 10 minutes
• Up to 100 rounds per session
• Multi-cycle support with rest between cycles
• Optional warm-up and cooldown phases
• Five ready-to-use presets: Tabata, HIIT 30/30, EMOM 10, Boxing Rounds, Core Circuit

STAY IN THE ZONE
• Clear countdown with audio cues on the final three seconds
• Haptic feedback on every phase change
• Cues play over your music without pausing it
• Keeps running when your screen is locked
• Screen stays awake during a session

TRACK YOUR PROGRESS
• Every session saved automatically
• Weekly activity chart
• Daily streak counter
• Total work time across all sessions
• Share your finished session

MADE THE RIGHT WAY
• Works completely offline, even in airplane mode
• No data collected, no tracking, no analytics
• No permissions requested
• Full dark mode
• VoiceOver and Dynamic Type support
• iPhone and iPad

Round Zero does one thing and does it well: it counts your intervals, and gets out of your way.