Legality

Why is HyperPulse designed to be legal but Apple Watch isn't in high school sports?

Three reasons. (1) Form factor: HyperPulse is designed for under-the-jersey upper-back wear; Apple Watch is on the wrist (NFHS Rule 3-5-3 restricts wrist electronics in basketball and most other sports). (2) Communication: HyperPulse is BLE-only one-way; Apple Watch supports cellular calls + SMS (NFHS prohibits two-way communication devices). (3) GPS: HyperPulse has zero GPS hardware; Apple Watch broadcasts GPS during games.

The wrist rule

NFHS Rule 3-5-3 (basketball) and equivalent rules in other sports prohibit 'electronic equipment' on wrists during sanctioned games. Watches are explicitly named. The intent is to prevent officials, coaches, or scoring systems from being influenced by wrist-mounted devices.

The two-way communication rule

Most NFHS rules prohibit two-way communication during sanctioned play. Apple Watch supports calls, texts, and Siri voice commands — all two-way comm. HyperPulse is designed as a one-way BLE broadcaster: data flows out of the patch to the coach's tablet. Nothing flows in.

The GPS rule

Some state associations explicitly ban GPS hardware on the field (recreational pickup is fine; sanctioned competition is not). Apple Watch broadcasts GPS continuously. HyperPulse has zero GPS hardware — by design.

Real-world enforcement context

Visible watches and communication devices often create game-day questions. HyperPulse uses a rule-review card protocol so coaches can ask before warmups instead of forcing an official to decide mid-game.

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