A GUI calculator closely modeled after Emacs M-x calc. RPN, arbitrary-precision integers/fractions/floats, with the same dense keystroke vocabulary.

Pre-built binaries for macOS (Apple Silicon) and Windows (x64) are on the releases page. Linux users build from source (below).

See manual.md for the full keystroke reference. The short version: type numbers and press RET to push, then operators (+, -, *, /, ^, etc.) consume from the top of the stack. U undoes, D redoes, Ctrl+G cancels a long calculation.

$ cmake -B build
$ cmake --build build

Dependencies (GMP, MPFR, wxWidgets) are downloaded and built by CMake's FetchContent. The executable lands at build/bin/stackcalc.app (macOS) or build/bin/stackcalc[.exe].

On Linux, where the distro packages those libraries, prefer:

$ cmake -B build -DDEPS=LOCAL
$ cmake --build build

Apt example: apt install libgmp-dev libmpfr-dev libwxgtk3.2-dev. -DDEPS=LOCAL finds them via the system's wx-config / pkg-config instead of building everything from scratch. (Caveat: distro libgmp/libmpfr aren't compiled with -fexceptions, so the Ctrl+G "cancel a runaway calculation" feature can't unwind through their stack frames — the result-size cap still works as a backstop.)

The calculator itself is in the public domain (see UNLICENSE). It depends on GMP (LGPL), MPFR (LGPL), and wxWidgets (wxWindows Library Licence — LGPL with a derived-works exception).