Five free tools for building or upgrading a gaming PC: a PSU calculator you can embed on your own site, a "will it fit?" checker for graphics cards and coolers, a CPU bottleneck test that reads the GPU usage you measure in your own game, a "can my PC run it?" check against official game requirements, and an open power table (CSV and JSON, CC BY 4.0). Every number links to the maker's spec page. No sign-up, in English and Spanish.