SheetSmith is an inspectable, local Python command-line toolkit for UTF-8 CSV files. Package v1.1.0 keeps the original INPUT OUTPUT command for case-sensitive, whole-row deduplication and adds documented cleaning options, merging by vertically appending files with matching headers, and a basic JSON profile of rows, columns, blanks and distinct values. Merging is not a relational database join; deduplication is not fuzzy matching or entity resolution. The download includes source code, fictional sample CSVs and actual example outputs, regression tests, a command reference, setup instructions and an actual usage-preview PDF. Header-only files retain their headers; an empty file without headers receives a controlled error rather than an IndexError. Use the documented overwrite option only after checking your paths and backups. Python 3.10+ and a terminal are required; only the Python standard library is used. The toolkit processes local CSV data in memory. It does not open native XLSX workbooks, run AI, connect to cloud services or provide a browser dashboard. It preserves formula-like cell text; spreadsheet applications may interpret that text when opening a CSV. Review outputs before using them in a real workflow. Cover PNGs are concept artwork rather than screenshots of an included graphical interface. Original usage terms, unchanged from the README: Personal and small-business commercial use is allowed for one purchaser. Do not resell, redistribute, or upload the source files as a competing product. The original Quick Start permits customizing source files and exporting a final customer-facing version with your own tools. LICENSE.txt repeats those terms; no additional permissions are granted.