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Data Sparrow
Local by default

Data Sparrow

Known boundaries

Data Sparrow is deliberately a table workflow, not a spreadsheet clone, hosted database, or guarantee that every file fits in memory.

File size and memory

Local limits depend on measured browser and device behavior. A large source, expanded workbook, join, pivot, or comparison can exceed available memory. The app will offer sampling or an explicit API option where supported, never a silent upload.

Spreadsheet fidelity

XLS, XLSX, XLSB, and ODS imports expose values or cached formula results only. Formulas, macros, formatting, charts, external links, and embedded objects are not executed or preserved. XLS, XLSB, and ODS are import-only.

Inference is not truth

Column types, delimiters, encodings, locales, headers, and date formats can be ambiguous. Inference is labeled and raw strings remain authoritative until you explicitly convert them.

Pseudonymization

Masking, hashing, and token replacement reduce exposure but do not automatically anonymize a dataset. Re-identification risk depends on context, auxiliary data, secrets, and the chosen transformation.