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Every spa already signals somehow. Most of the ways involve wiring, noise, or a group chat nobody can mute. Here’s the honest comparison.
Call-light and intercom costs vary by installer; figures reflect typical multi-room installations.
Because a group thread is the opposite of a signal. Everyone gets everything, nothing can be acknowledged, personal numbers end up in work traffic, and a therapist mid-massage can’t tell an urgent buzz from a lunch-order buzz. Six months in, the thread is where messages go to be missed.
A signal reaches exactly the right person, carries its own tone, comes back acknowledged, and stores no guest information anywhere.
Try AltoSignal on the devices you already own — free for 30 days.