The Nintendo Switch Online app can be downloaded to your smart device from the App Store (iOS) or the Google Play Store (Android).
Which smart devices are supported?
iOS (Apple): Devices using iOS 10.0 or later are supported.
Android: Devices running Android OS 5.0 or later are supported
Prior to April 07, 2019, the app was compatible with iOS 9.0 and with Android OS 4.4. In order to provide a better experience, improvements were implemented with an app update on April 07, 2019 which increased the OS version required. If you are using a lower OS version, please consider updating to a newer OS or use the app on a compatible device.