Radius
Contact Radius
Last updated: July 8, 2026
Radius is a public-safety awareness service at https://radiusalert.app/.
Business / operator
Radius is operated by John Rubisoff. The service name and SMS sender shown to users is Radius.
Customer support
For subscription, billing, privacy, or account questions, email support@radiusalert.app.
Mailing address
John Rubisoff
Radius
13401 Briar Hollow Drive
Austin, TX 78729
United States
SMS help and opt-out
Radius SMS recipients can reply HELP for help or STOP to unsubscribe. Existing subscribers can also manage or cancel alerts at https://radiusalert.app/manage/.