Read how we test, rate, and review products on TechRadar. The aim was to push each product to see how useful it was in a range of different situations.

We then tested the service to see how the software could be used for retrieving keys for both Windows and other software. To test for the best Windows 10 product key finder we first set up an account with the relevant software platform, whether as a download or as an online service. How we tested the best Windows 10 product key finder Additionally, free and budget software options can sometimes prove limited when it comes to the variety of tools available, while higher-end software can really cater for every need, so do ensure you have a good idea of which features you think you may require. When deciding which Windows 10 product key finder to download and use, first consider what your actual needs are, as sometimes free platforms may only provide basic options, so if you need to use advanced tools you may find a paid platform is much more worthwhile. Which Windows 10 product key finder is best for you? It also provides lists of all installed software and running system processes, though this information is readily available through Windows itself. It's compatible with all versions of Windows, from NT all the way through to Windows 10, but doesn't find keys for Microsoft Office or any other software. Like Belarc Advisor, Free PC Advisor provides a wealth of information about your whole system – not just its software – though its interface isn't quite as intuitive. Free PC Audit is another portable application, and doesn't even come as a zip archive – just download the exe file and run it to begin scanning.

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