You can use Librem One services on any desktop, mobile or embedded platform with compatible software.
Native apps for Android are available on the Google Play Store and F-Droid. Native apps for iOS are available on the Apple App Store. Native apps for Librem hardware (including the Librem 5) are coming to the PureOS store soon.
You can also set up third-party software on any platform, including GNU/Linux, *BSD, macOS and Windows. Please refer to our documentation for details.
If you need to pick a client for your platform, the following guides and lists will help: