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The main difference between the free and the pro version is that the free version is only a JavaScript file that queries browser attributes and computes a hash from them (performs fingerprinting). In a situation with identical browsers, it will generate identical fingerprints. If two different users use the same browser (same vendor and version) on the same phone model, you will get two identical fingerprints and will not be able to tell these two users apart.
To solve this, the pro version processes the identification data on the server. In addition to regular fingerprinting, it analyzes vast amounts of auxiliary data (IP addresses, time of visit patterns, URL changes and more) to be able to reliably deduplicate different users that have identical devices.
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