StretchIT: Interval Timer HIIT

About StretchIT: Interval Timer HIIT

Build your perfect workout timer. Create fully customizable interval timers for HIIT, Tabata, stretching, yoga, circuit training, boxing, and any timed routine — from quick 3-tap setup to advanced per-interval control over every sound, color, and transition.

⏱️ POWERFUL TIMER • Prepare, Work, Rest, and Cooldown phases with customizable durations • Time-based or rep-based intervals with per-rep tracking • Countdown alerts (3, 5, or 10 seconds) before each transition • Auto-advance, manual confirmation, or skip between phases • Count up or count down display per interval • Skip-on-last-set to avoid repetitive final phases • Screen lock to prevent accidental taps during intense workouts • Keep screen awake during sessions

🎙️ VOICE CUES & AUDIO • Text-to-speech voice guidance in 11 languages • 15 built-in sound effects: bells, whistles, gongs, boxing bells, and more • Customize start, alarm, and countdown sounds per phase or per interval • Audio ducking — automatically lowers background music during voice cues • Full volume control with real-time preview

📋 FLEXIBLE PRESET EDITOR • Simple mode: set rounds, work time, and rest time — start in seconds • Advanced mode: build multi-block workouts with per-interval customization • Customize each interval's name, color, sound, notes, and behavior • Add notes to any interval for form cues or reminders • Duplicate, reorder, and organize presets with tags and favorites • Import and share presets with anyone via shareable links

❤️ HEART RATE MONITORING • Connect any Bluetooth (BLE) heart rate monitor — Polar, Garmin, Wahoo, Whoop, and more • Real-time BPM display during workouts • Auto-reconnect to your paired device • Signal strength indicator for reliable connections

📅 SCHEDULE & TRACK • Schedule workouts for specific dates or set daily/weekly recurring sessions • Push notification reminders so you never miss a workout • Calendar view with visual indicators for completed and scheduled sessions • Session history tracks preset name, duration, sets, work time, and rest time • Monthly stats to see your training consistency

🎨 THEMES & CUSTOMIZATION • 7 color themes: Warm, Retro, Ocean, Forest, Midnight, Rose, Nord • Per-phase color coding — see your workout state at a glance from across the room • 12-hour or 24-hour time format • Haptic feedback (full, essential, or off) • Timer controls position (top or bottom of screen)

🌍 11 LANGUAGES English, Japanese, Spanish, German, Portuguese, French, Korean, Chinese, Italian, Russian, and Turkish — with localized voice cues.

💎 STRETCHIT PRO Unlock unlimited presets, unlimited scheduled sessions, unlimited tags, heart rate monitoring, preset sharing, advanced editor, premium themes, and an ad-free experience with a Pro subscription.

Perfect for HIIT workouts, Tabata-style intervals, stretching routines, yoga sessions, circuit training, boxing rounds, calisthenics, meditation, and any timed activity.

Privacy-first: no account required, no personal data collected. Your workouts stay on your device.