The "Snowbirds US Day Tracker" app helps you track the number of days you're spending in the USA, which is essential to avoid being classified by the IRS as a US resident for tax purposes. Now with Companion Snowbirds support, you can track days for multiple people from one account - perfect for families traveling together. The app also features a rolling 12 month/365 day calendar to help you track how many days you have spent in the U.S. over the past 12 months/365 days. Features include -US Day counter -Substantial Presence Test -Rolling 12 month/365 day calendar -Cloud based database so you can login and view your data on any phone or tablet. -Alerts and warnings for important milestones - NEW: The Companion Snowbirds feature lets you manage multiple travellers from one account - perfect for tracking your spouse, family members, or travel companions. Easily switch between profiles to view and manage each person's US day count separately. And more Terms and Conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/