Load a baseline and current export to measure the headline change, rank the categories behind it, catch schema and completeness drift, and export a report with visible calculations.
A useful period comparison needs more than two totals. CSV Compare matches shared columns, calculates denominator-safe changes, ranks category drivers, checks structure and missing values, then keeps the evidence together in one local report.
Drop CSV or Excel snapshots. Both are parsed and profiled locally in this tab.
Select the numeric total and category grouping that answer the decision in front of you.
Download standalone HTML, Markdown, or a complete driver CSV with every calculation visible.
The change, its largest observed drivers, and the data-quality checks behind it — without a black box or uploaded file.
Rank each region, product, channel, or status by absolute change and contribution to the net movement.
See added, removed, and inferred type-changed columns plus missing-rate changes with separate row denominators.
Save labels and selected column names for the next reporting cycle without saving rows, values, or results.
Export script-free HTML, Markdown, or driver CSV. Optional share links disclose when source data is encoded.