It based on a device to which your phone will connect via the wi-fi network. During your navigation it will record a network trace. That trace will then be analyzed to detect stalkerware on your phone.
For a good and complete description, I suggest to read that arcticle : TinyCheck: Stalkerware detection that doesn’t leave a trace from MalwareBytes.
By default, at the end of the analysis, you can transfer your report to a USB stick, which is not always convenient. You need to have a USB key with you and handle the device. That’s why we have improved TinyCheck by adding a receipt printer.
This makes it much easier to transfer the report. You can download an encrypted version of your report afterwards via a QR code and a password.
Here is a short demonstration:
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