The research shortlist
Page updated
Qalculate!Top pick
A powerful open-source desktop calculator with deep unit and symbolic-math support.
Metadata checked Aug 18, 2026
Best overall fit: closest to Numi’s text-and-conversion workflow while offering a mature desktop UI, active releases, and current macOS packages.
A mature GTK/Qt calculator with calculate-as-you-type input, extensive units and currency conversion, variables, arbitrary precision, symbolic algebra, equation solving, and plotting.
- 01GTK and Qt desktop interfaces plus an interactive CLI
- 02Calculate-as-you-type history, variables, custom functions, and matrices
- 03Hundreds of units with currency, time, date, and number-base conversion
- 04Symbolic algebra, calculus, arbitrary precision, interval arithmetic, and plotting
- macOS distribution is primarily through Homebrew or MacPorts rather than a signed standalone DMG.
- The GTK build brings a larger dependency footprint than a native Mac-only calculator.
Evidence sources (11)
- Official Qalculate! Qt UI repositorySource available ·
- Official Qalculate! library and CLI repositorySource available ·
- Qalculate! Qt UI GPL license fileLicense ·
- Qalculate! Qt UI releasesRelease ·
- Official Qalculate! homepageWebsite ↗ ·
- Official downloads, including Mac OS binariesFree at review time ·
- Homebrew macOS bottle for Qalculate! QtDocumented macOS path ·
- Official Qalculate! macOS screenshotScreenshots ·
- GitHub REST repository APISource available ·
- GitHub license metadataLicense ·
- Latest GitHub releaseRelease ·
Numbat
A type-safe, unit-first scientific calculator for the terminal.
Metadata checked Aug 18, 2026
Best for reliable unit-aware calculations: actively released, well-documented, dual-licensed, and installable on macOS through Homebrew or an Apple Silicon release.
Full review — capabilities, 2 caveats, evidence
A maintained Rust REPL for one-off calculations where physical dimensions are first-class types. It supports conversions, variables, functions, dates, and a broad scientific standard library.
- 01Interactive terminal REPL with history and completion
- 02First-class units, dimensional checking, and unit conversions
- 03User-defined variables, functions, assertions, and customizable modules
- 04Scientific, date, and time functions with native macOS builds
- Command-line only; the project explicitly has no graphical calculator interface.
- Its syntax is deliberately strict and it is not a full computer-algebra system.
Evidence sources (13)
- Official Numbat repositorySource available ·
- Numbat Apache-2.0 license fileLicense ·
- Numbat MIT license fileLicense ·
- Latest Numbat release with Apple Silicon macOS assetRelease ·
- Official Numbat homepageWebsite ↗ ·
- Numbat releases and downloadsFree at review time ·
- Official macOS installation instructionsDocumented macOS path ·
- Homebrew macOS bottles for NumbatDocumented macOS path ·
- Official Numbat project iconScreenshots ·
- GitHub REST repository APISource available ·
- GitHub license metadataLicense ·
- Latest GitHub releaseRelease ·
- Latest macOS release assetFree at review time ·
Kalker
A math-syntax calculator for variables, symbolic tools, and power users.
Metadata checked Aug 18, 2026
A credible power-user alternative with recent releases, an MIT license, official macOS downloads, and stronger project history than newer Mac-only calculator entrants.
Full review — capabilities, 2 caveats, evidence
A compact cross-platform calculator with user-defined variables and functions, complex numbers, vectors, matrices, roots, differentiation, integration, syntax highlighting, and number-base support.
- 01User-defined variables and functions with completion
- 02Differentiation, integration, root finding, and complex numbers
- 03Vectors, matrices, sums, piecewise functions, and number bases
- 04Official macOS binaries plus Homebrew installation
- The project does not document a physical-unit or currency-conversion system comparable to Numi.
- Its main experience is terminal/web based rather than a native notepad or menu-bar app.
Evidence sources (11)
- Official Kalker repositorySource available ·
- Kalker MIT license fileLicense ·
- Kalker releasesRelease ·
- Official Kalker homepageWebsite ↗ ·
- Homebrew macOS bottles for KalkerDocumented macOS path ·
- Official Kalker project logoScreenshots ·
- Official Kalker preview imageScreenshots ·
- GitHub REST repository APISource available ·
- GitHub license metadataLicense ·
- Latest GitHub releaseRelease ·
- Latest macOS release assetFree at review time ·
Specifications, side by side
| Attribute | 1 · Qalculate! | 2 · Numbat | 3 · Kalker |
|---|---|---|---|
| License | GPL-2.0-only | Apache-2.0 | MIT |
| Platforms | macOS, Windows, Linux | macOS, Windows, Linux | macOS, Windows, Linux |
| Status | Checked | Checked | Checked |
| Version | v5.12.0 | v1.23.0 | v2.2.3 |
| Stars | 580 | 2.6k | 1.9k |
| Last push | |||
| Caveats | 2 | 2 | 2 |
About Numi
Numi — Smart calculator for Mac that handles math, conversions, percentages, and more.
Setapp listing: Calculate and convert anything
