PCMark is described as 'industry standard benchmark for Windows PCs and Android devices'. There are more than 10 alternatives to PCMark for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is AIDA64. It's not free, so if you're looking for a free alternative, you could try UserBenchMark or Cinebench. Other great apps like PCMark are 3DMark (Paid), UNIGINE Benchmarks (Freemium), Furmark (Free) and Geekbench (Paid).
AIDA64 is a system information, diagnostics, and auditing application developed by FinalWire Ltd., that runs on Windows, Android, iOS, Windows Phone and Tizen operating systems. It displays detailed information on the components of a computer.
CINEBENCH is a real-world test suite that evaluates your computer's performance capabilities. It's the perfect tool to compare CPU and graphics performance across various systems and platforms (Windows and Mac OS X). And best of all: It's completely free.
3DMark includes everything you need to benchmark your hardware in one app. Whether you're gaming on a smartphone, tablet, notebook, laptop, desktop, or a high-performance gaming PC, 3DMark includes a benchmark designed specifically for your type of device.