OBD2 wireless dongles are they safe?

Im searching for Obd2 wireless dongle to use it with Iphone.
Is somebody here using such a device and is it safe for our cars.
Since Torque Pro is only for Android, which is the best app for Iphone?

Thanks


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I have this OBD2 WiFi device and using it on my 06 A6 Allroad with Torque Pro. It's working on iOS too with DashCommand.