SimpleSpread is an open-source native macOS spreadsheet app written in Swift, with XLSX support, CSV import and export, formula calculation, pivot tables, and spreadsheet editing tools. It is suited to users who want a local spreadsheet application and contributors who want to build or extend an MIT-licensed project.
SimpleSpread is an open-source native macOS spreadsheet application written entirely in Swift. It uses XLSX as its native file format and supports CSV import and export, with a spreadsheet model, formula engine, XLSX/ZIP/CSV I/O, and grid implemented from scratch rather than through third-party libraries.
The app is designed for working with conventional spreadsheets as well as analysis workflows. It includes documented support for 157 functions, Excel-style editing behavior, and pivot tables that can be created, refreshed, and saved in files shared with Excel. The repository also provides build, test, release, and update documentation for users and contributors.
Reads and writes OOXML SpreadsheetML XLSX files, with support for shared strings, styles, number formats, formulas with cached values, merged ranges, frozen panes, and date-system normalization. Files are intended to interoperate with Excel, Numbers, and Google Sheets.
Provides an Excel-style PivotTable workflow with a fields panel, row, column, value, and filter areas; summaries, percentage views, comparisons, subtotals, layouts, date grouping, number ranges, sorting, filtering, and refresh.
Documents 157 functions with spreadsheet-oriented operator precedence, type coercion and comparison behavior, criteria wildcards, lazy IF evaluation, cross-sheet references, whole-row and whole-column ranges, volatile functions, cycle detection, and iterative financial solvers.
Handles delimiter detection, BOM and CP1252 encoding detection, quote-aware parsing, leading-zero preservation, formula-injection-safe imports, and RFC 4180 export with UTF-8 BOM, CRLF, full-precision numbers, and ISO dates.
Includes cell editing states, type-to-replace, in-place editing, data-edge navigation, fill-handle formula translation, fill commands, formatting controls, a lossless internal clipboard with TSV interoperability, and per-gesture undo.
Supports find and match navigation, jump-to-cell through a name box, zoom from 25% to 400%, recent files, Finder file association, automatic updates through Sparkle, and formatting for text, numbers, dates, times, percentages, currency, and scientific values.
Open, edit, format, and save workbooks that need to move between SimpleSpread and other spreadsheet applications using XLSX, including workbooks containing formulas, frozen panes, merged ranges, and pivot tables.
Summarize tabular records by region, product, date, or other fields using rows, columns, values, and filters. Group dates or numeric ranges, choose summary calculations, and refresh the result when source data changes.
Bring delimited text files into a spreadsheet while preserving leading zeros and handling common encoding and delimiter differences, then export structured data as RFC 4180 CSV for downstream use.
Build and run the application locally, execute its test suite, inspect the documented formula and spreadsheet architecture, or contribute changes through the public repository.
SimpleSpread is a native macOS spreadsheet application written entirely in Swift. The repository provides build instructions for macOS 14 or later with Xcode 16 or later.
The native file format is XLSX. SimpleSpread can import and export CSV, and it also supports CSV, TSV, and TXT imports; these text-file imports require saving the document as XLSX.
Yes. The app supports creating pivot tables from tabular data, placing them on a new sheet or the current sheet, grouping dates or number ranges, filtering and sorting items, refreshing results, and saving pivot tables in XLSX files.
The README documents 157 spreadsheet functions, including cross-sheet references, criteria functions such as SUMIF and COUNTIF, lazy IF evaluation, volatile functions, cycle detection, and iterative solvers for IRR, RATE, and XIRR.
SimpleSpread is distributed as open-source software under the MIT license. The repository includes scripts for assembling an app and DMG; releases can be signed and notarized when the required Apple credentials are configured, otherwise the DMG is ad-hoc signed.
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