Flex Interval Timer

Flex Interval Timer is a highly flexible interval timer designed for any kind of training — weight training, HIIT, stretching, and more. > Combine Phases Freely Build your sessions with phases like Warm-Up, Work, Rest, and Cool-Down - in any order and duration you choose. > Loop Settings Group phases into loops to handle complex interval patterns with ease. Perfect for Tabata, circuit training, and more. > Countdown to Stay Ready A countdown before the start and before each phase ends keeps you prepared for what's coming next. > Audio Cues for Timing Sound effects notify you at every phase transition so you never lose track. > Customize Phase Names Rename phases in the menu to match your own training style. > Track Your Training History Review completed sessions in a calendar view to stay motivated and consistent. > Save Presets for Quick Start Save your favorite routines as presets and launch them in one tap next time. > Dark / Light theme support > Available in Japanese and English