A numerical computing environment compatible with MATLAB syntax, featuring 400+ built-in functions. Runs in your browser or on the command line.

Documentation | Browser IDE | REPL | Plot Gallery

Try it in the browser at numbl.org -- no installation required.

Or use the CLI:

npx numbl                      # interactive REPL
npx numbl eval "disp(eye(3))"  # evaluate inline code
npx numbl run script.m         # run a .m file

Install globally for regular use:

npm install -g numbl

For faster linear algebra, FFT, and C++ operations, build the optional native addon:

# Prerequisites: C++ compiler, libopenblas-dev, libfftw3-dev (or equivalents for your OS)
numbl build-addon

Rebuild after upgrading numbl (npm install -g numbl@latest).

Full documentation is available at numbl.org/docs, covering:

• Getting Started -- installation, CLI options, native addon
• Language Features -- operators, data types, control flow, classes
• Built-in Functions -- 400+ functions by category
• Plotting -- 2-D/3-D plots, examples, CLI plot server
• Library Usage -- using numbl as an npm package
• Differences from MATLAB -- behavioral differences and limitations

The Numbl extension for VS Code provides inline error diagnostics and a built-in figure viewer.

Jeremy Magland and Dan Fortunato, Center for Computational Mathematics, Flatiron Institute.

Apache 2.0

numbl is not affiliated with, endorsed by, or supported by MathWorks, Inc. MATLAB is a registered trademark of MathWorks, Inc.