Whistle brings free calling to other Whistle users to your Mac.

Whistle provides low domestic and international rates to and from your Whistle number on landlines and mobile phones.

We offer 20 minutes of free calling to and from numbers in the contiguous 48 US states as a chance to try Premium Whistle.


  • Make and take calls from your desktop or mark yourself as unavailable

  • Choose your look and feel from seven different skins

  • Has built-in integration with your Mac's Address Book

  • Secure, encrypted calling prevents snooping on public wireless networks

  • High definition calls to other Whistle clients sound spectacular

  • Includes two-line calling features, including call waiting and three way calling

  • Forwards your Whistle calls to any phone number via our call forwarding service for a low per-minute rate

  • Support for In App purchases through the Mac App Store

    And, one note: Your best experience is going to be with headphones. Using the built-in speakers and mic at the same time may cause echo.

    Please direct comments on bug fixes or feature requests to either or to our support site at We do really want to hear from you and we've set up these forums to address your thoughts directly.

  • Whistle Phone is also available for your iPhone, iPod Touch and iPad from the App Store *

  • What's New
    What's New in 1.34:
    ❏ Audio bug fix for USB handsets

    What's New in 1.33:
    ❏ Support for OS X Mountain Lion's Notification Center. Answer or return calls by clicking on their notifications.

    What's New in 1.32:
    ❏ High definition audio support for Whistle-to-Whistle calls.

    ❏ Secure calls with the same level of security protection as you use when you shop or bank online.

    ❏ Lion sandbox support

    ❏ In App Purchase support for adding credit

    ❏ Please note that Bonjour and Growl functionality have been removed in this version.

    Whistle Phone (com.vailsys.whistle) is a Mac software application that has been discovered and submitted by users of

    Operating System: Mac

    Default Install Path: /Applications/Whistle