Predictable on Android
Contrary to iOS operating system which only runs on Apple devices, Android is an open-source project, meaning that any hardware manufacturer can build a device that runs the Android operating system. As Android runs on a wide range of device configurations, some features are not available on all devices, which means that some devices do not support some apps. For example, some devices may not include certain sensors and may, therefore, not be supported by an app.
When submitting the app Predictable to Google PlayStore, a technical compatibility test is made on their simulator. As a software developer, we can choose which version of the operating system Predictable should support but we cannot know which specific devices are compatible unless we test them ourselves.