ArcX vs Loop Timer

ArcX is the only fitness app that matches music to your live heart rate and mood in real time. Not recommendations. Not a curated playlist. A patented performance system that evolves with every rep, every stride, every beat. MUSICBOOST - PERFORMANCE MUSIC, POWERED BY SCIENCE Your mood sets the tone. Your heart rate writes the rest. Before your workout, tell MusicBoost how you're feeling, what you're doing and how hard you're going. Connect Spotify, link your wearable and press Play. From there, MusicBoost reads your live heart rate and adapts your music in real time - turning it up as you push harder and dialling it back as you ease off. No manual adjustments. No skipping tracks. Just the right song, at the right moment, every time. Research shows tempo-matched music delivers: +15% performance output -12% perceived fatigue +20% training endurance Spotify connected. Apple Music coming soon. Protected by US Patent No. 12,681,987. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

A simple interval timer that loops work and rest. Works with Apple Watch and the Dynamic Island. Set your times, tap start, and it loops automatically — for Tabata, HIIT, circuit training, stretching, or timing sets at the gym. ■ Always visible in the Dynamic Island and on the Lock Screen See the remaining time and current phase even while using other apps. The timer keeps running with the screen locked and alerts you with sound and vibration. ■ Apple Watch, right on your wrist Start, pause and skip from your Apple Watch while your iPhone stays in your bag. Phases are signalled by haptics. Both devices stay in sync and show the same remaining time. Live heart rate appears on the Watch, the iPhone and the Dynamic Island. ■ Apple Health Sessions are saved as HIIT workouts. With Apple Watch, heart rate and calories are recorded too. Review your history in the app: duration, energy, average and maximum heart rate. ■ Three counter styles • Digits — just a big number • Ring — the remaining time shrinks clockwise • Bars — a bar chart you can read at a glance Switch styles while running. Landscape is supported. ■ Sounds you can choose Three volume levels and three sounds (beep, chime, wood). Preview each one with a tap. ■ Fine control Adjust times in steps of 1, 5, 10 or 30 seconds — 23 seconds is no problem. ■ Two looks, nine languages Choose the gray or pastel theme. Available in English, Japanese, Simplified and Traditional Chinese, Korean, Spanish, German, French and Portuguese. ■ Ready-made presets • Tabata 20s/10s × 8 rounds • HIIT 30s/30s × 10 rounds • 4020 40s/20s × 8 rounds × 2 sets • EMOM 50s/10s × 10 rounds ■ Free and unlocked The free version runs all four presets, lets you switch counter styles and shows the Dynamic Island. A one-time purchase (no subscription) unlocks: • Changing every duration • Saving your own named presets • Volume and sound choice • Apple Watch app with heart rate • Apple Health recording and workout history