AFileFix Document Comparison vs UltraCompare

AFileFix Document Comparison is a free web tool for comparing one pair of document versions. It identifies added, removed, and modified text in PDF or DOCX files, including mixed-format pairs, with a 25 MB limit per file. Results appear on screen, and a downloadable DOCX report provides analysis and plain-English explanations of each change and why it might matter. The tool is recommended for structured, text-heavy documents such as contracts, policies, proposals, terms of service, and manuals.

Both files are sent to Anthropic's Claude API for processing. AFileFix says it removes uploaded files from its server within minutes. Anthropic retains API data for up to 30 days for safety review, then deletes it, and does not use it to train AI models. The comparison covers text, not layout-only changes such as fonts, spacing, page breaks, or margins. Scanned and password-protected PDFs are unsupported, and the tool does not OCR scanned files. Documents over approximately 150 pages may be truncated. It does not provide three-way comparison, Word track changes, or legal redline output.

UltraCompare compares and merges files, folders, and documents, including Word, Excel, and PDF. It can show two or three files side by side and lets users merge differences visually. Folder tools compare, merge, and synchronize directory structures, with rule-based automation available. For spreadsheets and other tabular data, it can compare and merge cells, rows, or columns, including across multiple Excel sheets. UltraCompare works as a diff and merge tool with Git, Subversion, and CVS. It can compare remote files over FTP or SFTP and by URL, and folders over FTP and network shares. ZIP, RAR, and JAR contents can be compared without extraction. Additional tools include highlighting for characters, words, or lines; options to ignore whitespace or case; editable comparisons; saved sessions; and HTML or text reports. The maker lists Windows, macOS, and Linux, while a fully functional Windows trial includes all features for 30 days. There is no free plan. Subscriptions start at $99.95 a year for Core or $119.95 a year for Enterprise; perpetual options cost 179.95 USD or 249.95 USD once.