HR Zone Trainer is a dead-simple heart-rate zone trainer for runners and interval athletes — free, no subscription, one screen to configure and one button to start. What makes it different from other zone apps: Your own zone ceilings, not an age-based formula — enter the numbers from your own watch, lab test, or coach (or let it estimate them from Apple Health). Real interval structure: build a session from warm-up / work / recovery / cool-down blocks, load a preset like the Norwegian 4×4, or save your own templates. Audio coaching that survives a locked screen: spoken BPM readouts and zone-crossing alerts that duck your music or podcast rather than interrupting it. Works with any standard Bluetooth heart rate strap — Polar H10, Whoop (broadcast mode), Garmin, Wahoo, and others — through the universal Heart Rate Service, no vendor-specific setup required. This is a training tool, not a medical device. It is not intended to diagnose, treat, cure, or monitor any medical condition.
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