Plainrow

Lite

Two files. Stack. Dedupe. Export.

Counter

Two files. Stack them, then dedupe.

Drop up to two CSV files here

Try a synthetic demo

Kitchen · $19 · filter, columns, replace, dates, sort, recipes, join, stack, split, clean · more than two files

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Stack two CSV files

Start with two weekly timesheets, then Stack them. Dedupe and export stay on the toolbar. Files never leave this computer.

How this works

Open two CSV/TSV files, stack them, dedupe, export. Files never leave this computer.

Open two CSV or TSV files with the picker, drag-and-drop, or load the stack demo — two weekly timesheets, not a copy of one file.
Stack is the first toolbar button: union of columns, rows appended. Dedupe keeps the first or last row for each key.
Export writes a comma-separated file to this computer. A UTF-8 BOM is optional for Excel.

Plainrow Lite is one HTML file. You do not install anything and you do not need a network after the file is on disk. There is no telemetry.