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At the time of writing, this means devices running iOS 13 and iOS 12 or later are recommended (iOS versions down to 10 are known to work but are not actively developed), however this will change as Apple release new operating system updates.
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At the time of writing, this means devices from Android 10 through to Android 8 (Oreo) are officially supportedand later are officially supported (Android versions down to 8 are known to work but are not actively developed). The Crisisworks App has been reported to run on older operating systems, however some or many of the features may not work. If you have an older device, see if you can update the operating system.
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