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At the time of writing, this means devices running iOS 11 13 and iOS 12 are recommended (iOS versions down to 10 are supportedare 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 to Android 8 (Oreo) are officially supported, and Crisisworks is known to run on devices as low as Android 4.4.4 (Kit Kat).
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