Passwords Plus has separate apps for Mac, Windows, iOS (iPhone/iPad/iPod) and Android. You can sync between all of these different platforms, so you can have all of your data on all of your devices and computers. There is a charge for each platform, so you will need to pay for the platforms you are using. Once you purchase a copy for a particular OS or platform, you can install it on multiple devices using that platform. For example, if you purchase a copy of Passwords Plus iOS you can use it on both your iPhone and iPad, provided each iOS device is using the same App store Apple ID. Similarly, you can use it on multiple Macs if you own a copy of Passwords Plus for Mac, etc.