Paint color picker
GB/T 3181 paint film colors (83) and RAL Classic (216): look up by code, and find the closest code in the other system.
Steel handbook
Weight and surface area of H-beams, channels, angles, pipes, plates and more, with GB section tables.
Document privacy cleaner
Scan DOCX and PDF files for author, company, revision and other hidden metadata, and remove it. Files never leave your browser.
Cost file viewer (GCFX)
Open Sichuan .GCFX / .SGCFX bid files: summary, bill items, labor/material/machinery and fees. Parsed locally, never uploaded.