GS-Calc is a spreadsheet that can be used for various purposes thanks to its scalability - editing/cleaning CSV, text files with millions of rows, splitting/merging files in the XLSX/XLS, text and other file formats, building complex data models with millions of formulas and around 450 built-in functions. GS-Calc features fast binary lookup's with dynamic internal sorting when processing tens of gigabytes of data or more, 4GB+ workbook files, 32 million rows x 16,384 columns, a unique feature of organizing worksheets in a tree form, pivot tables with 32 million rows, up to 64 processor cores during calculations, built-in Monte Carlo Simulations, array/"spilling" formulas for any functions written by users in C/C++ as plain DLL libraries even to replace all built-in functions; Python integration with UDF functions. You can work in up to 100 synchronized panes for each open workbook to monitor results in various sheets and their regions. GS-Calc can be installed on any portable storage device and used without performing any registry modifications.
GS-Calc is commercial software from Citadel5. You can download it for free and use it as a trial before buying a license.
What is the latest version of GS-Calc?
The latest version is 24.3.1, released on Oct 7, 2026.
Is it safe to download GS-Calc?
The download button links to the official installer published on github.com, the same file Windows Package Manager installs. You can verify the downloaded file by comparing its SHA-256 checksum with c6b7b74de969ae108a89504c387c46e7d7d0e049c9e697a8c1c885a267c1cf8f.
Which Windows versions does GS-Calc support?
GS-Calc runs on Windows and is available for 64-bit (x64) systems.
How do I uninstall GS-Calc?
Open Settings › Apps › Installed apps, find GS-Calc and select Uninstall. From the command line, run winget uninstall --id=Citadel5-JP.GS-Calc -e.