Download of AirSync 4.1 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. This free Mac application is an intellectual property of Sergey Nes & Anton Umnitsyn.
From the developer:
AirSync is an application that offers effortless synchronization of Apple Stickies with your mobile devices. The AirSync software program synchronizes the regular MacOS's Stickies with smartphones. However, you need to make sure both devices are on the same Wi-Fi network.