Open the Shortcuts app, tap + to create a new shortcut.
Tap Add Action → search Open URLs → add it.
Paste this address into the URL field:
https://spinner.aims.works/spinner/app?voice=1
Name the shortcut Spinner (tap the name at the top).
Done. Now say "Hey Siri, Spinner" — it opens Spinner already listening.
One honest note: a web app on iPhone can't listen for "Hey Spinner" in the background the way Siri does — Apple doesn't allow that. The Shortcut above is the real-world version: Siri launches Spinner and it opens straight into a live listening session. The first time, iPhone will ask for microphone access — tap allow once and you're set.
On Android or desktop you can also just bookmark the …/spinner/app?voice=1 link, or add Spinner to your home screen and tap the mic when it opens.