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Microsoft Excel spreadsheets. Compare cell values, formulas, and structure across sheets.
Microsoft released the first version of Excel in 1985 for the Macintosh and brought it to Windows in 1987, where it rapidly became the world's most influential spreadsheet application. Excel uses the Office Open XML format (.xlsx, standardized as ECMA-376 and ISO/IEC 29500), storing workbooks as ZIP archives containing XML files that describe cells, formulas, styles, charts, and metadata. An estimated 750 million to 1 billion people use Excel worldwide, making it arguably the most important business software ever created. Excel workbooks power financial modeling on Wall Street, inventory tracking in warehouses, project management in construction, data analysis in research labs, and budget planning in households.
The application's formula system — from basic SUM and VLOOKUP to complex array formulas, LAMBDA functions, and dynamic arrays introduced in Office 365 — provides a programming paradigm accessible to non-programmers. Pivot tables transform raw data into interactive summaries, charts visualize trends, and conditional formatting highlights patterns. Excel's cell-based grid structure means that meaningful comparison requires cell-level diffing that can identify changed values, modified formulas, added or deleted rows and columns, reformatted cells, and altered sheet structures within a workbook. Power Query handles data import and transformation, Power Pivot enables data modeling with DAX expressions, and VBA macros automate repetitive tasks.
Excel connects to external databases, web APIs, and SharePoint lists, serving as both a data analysis tool and a lightweight application platform. The application's ubiquity in business ensures that Excel file comparison is one of the most commonly needed document diff operations.
Excel workbooks contain formulas, financial models, and business data where a single changed cell can cascade through dependent calculations with significant consequences. Cell-level Excel comparison reveals modified formulas that alter calculation logic, changed values in financial models that affect projections, added or removed rows that shift data ranges referenced by formulas, and reformatted cells that may indicate unauthorized edits.
Finance teams, auditors, and analysts comparing spreadsheet versions need to see exactly which cells changed and whether formula dependencies remain intact.
UtraDiff compares Excel spreadsheets with cell-level precision across all sheets. Each worksheet is parsed into a grid, matching cells by row and column position to highlight changed values, modified formulas, and altered cell formats. Added and removed sheets are identified as structural changes.
Formula expressions are compared as text to catch logic modifications distinct from value changes. Sheet names, defined names, and workbook metadata differences are reported alongside the cell-level comparison.
Supported extensions: .xlsx .xls