Pyodide Built-in Packages

Pyodide Built-in Packages

These packages are pre-built for Pyodide and available in WASM environments. Any package not on this list must have a pure Python wheel on PyPI to work.

Note: This list was snapshotted on 2026-02-26 from Pyodide's docs. For the latest list, check https://pyodide.org/en/stable/usage/packages-in-pyodide.html

affine, aiohappyeyeballs, aiohttp, aiosignal, altair, annotated-types, anyio, apsw, argon2-cffi, argon2-cffi-bindings, asciitree, astropy, astropy_iers_data, asttokens, async-timeout, atomicwrites, attrs, audioop-lts, autograd, awkward-cpp, b2d, bcrypt, beautifulsoup4, bilby.cython, biopython, bitarray, bitstring, bleach, blosc2, bokeh, boost-histogram, Bottleneck, brotli, cachetools, Cartopy, casadi, cbor-diag, certifi, cffi, cffi_example, cftime, charset-normalizer, clarabel, click, cligj, clingo, cloudpickle, cmyt, cobs, colorspacious, contourpy, coolprop, coverage, cramjam, crc32c, cryptography, css-inline, cssselect, cvxpy-base, cycler, cysignals, cytoolz, decorator, demes, deprecation, diskcache, distlib, distro, docutils, donfig, ewah_bool_utils, exceptiongroup, executing, fastapi, fastcan, fastparquet, fiona, fonttools, freesasa, frozenlist, fsspec, future, galpy, geopandas, gmpy2, google-crc32c, gsw, h11, h3, h5py, healpy, highspy, html5lib, httpcore, httpx, idna, igraph, imageio, imgui-bundle, iminuit, iniconfig, inspice, ipython, jedi, Jinja2, jiter, joblib, jsonpatch, jsonpointer, jsonschema, jsonschema_specifications, kiwisolver, lakers-python, lazy_loader, lazy-object-proxy, libcst, lightgbm, logbook, lxml, lz4, MarkupSafe, matplotlib, matplotlib-inline, memory-allocator, micropip, ml_dtypes, mmh3, more-itertools, mpmath, msgpack, msgspec, msprime, multidict, munch, mypy, narwhals, ndindex, netcdf4, networkx, newick, nh3, nlopt, nltk, numcodecs, numpy, openai, opencv-python, optlang, orjson, packaging, pandas, parso, patsy, pcodec, peewee, pi-heif, Pillow, pillow-heif, pkgconfig, platformdirs, pluggy, ply, pplpy, primecountpy, prompt_toolkit, propcache, protobuf, pure-eval, py, pyarrow, pycdfpp, pyclipper, pycparser, pycryptodome, pydantic, pydantic_core, pyerfa, pygame-ce, Pygments, pyheif, pyiceberg, pyinstrument, pylimer-tools, PyMuPDF, pynacl, pyodide-http, pyodide-unix-timezones, pyparsing, pyproj, pyrodigal, pyrsistent, pysam, pyshp, pytaglib, pytest, pytest-asyncio, pytest-benchmark, pytest_httpx, python-calamine, python-dateutil, python-flint, python-magic, python-sat, python-solvespace, pytz, pywavelets, pyxel, pyxirr, pyyaml, rasterio, rateslib, rebound, reboundx, referencing, regex, requests, retrying, rich, river, RobotRaconteur, rpds-py, ruamel.yaml, rustworkx, scikit-image, scikit-learn, scipy, screed, setuptools, shapely, simplejson, sisl, six, smart-open, sniffio, sortedcontainers, soundfile, soupsieve, sourmash, soxr, sparseqr, sqlalchemy, stack-data, starlette, statsmodels, strictyaml, svgwrite, swiglpk, sympy, tblib, termcolor, texttable, texture2ddecoder, threadpoolctl, tiktoken, tomli, tomli-w, toolz, tqdm, traitlets, traits, tree-sitter, tree-sitter-go, tree-sitter-java, tree-sitter-python, tskit, typing-extensions, typing-inspection, tzdata, ujson, uncertainties, unyt, urllib3, vega-datasets, vrplib, wcwidth, webencodings, wordcloud, wrapt, xarray, xgboost, xlrd, xxhash, xyzservices, yarl, yt, zengl, zfpy, zstandard

Also available (part of Pyodide runtime or marimo WASM)

• marimo
• duckdb
• polars
• micropip (for installing additional pure-Python packages at runtime)

Common third-party packages that do NOT work in WASM

These popular packages have C/native extensions not built for Pyodide: