Fylert is a lightweight desktop app that checks DOCX, XLSX and PPTX files. Depending on format, checks cover comments or notes, unaccepted tracked changes, hidden sheets or slides, speaker notes, external links, local or network paths, and selected metadata. Document checks run locally. Document contents are never uploaded for scanning. Checks are read-only. Free Beta for Windows 10/11 (unsigned installer) and Apple Silicon Macs on macOS 12+ (not notarized by Apple).