Cosmology Python Packages

camb

Code for Anisotropies in the Microwave Background

autolens

PyAutoLens: Open-Source Strong Gravitational Lensing

fgivenx

Functional Posterior Plotter

swiftsimio

Python library for reading SWIFT data. Uses unyt and h5py.

lenstronomy

Multi-purpose lens modeling software package

pysm3

PySM 3: Sky emission simulations for Cosmic Microwave Background experiments

mcfit

multiplicatively convolutional fast integral transforms, implementing FFTLog

astrodash

Deep learning for the automated spectral classification of supernovae

cosmology-api

The Cosmology API standard

abacusutils

Python code to interface with halo catalogs and other Abacus N-body data products

corrfunc

⚡️⚡️⚡️Blazing fast correlation functions on the CPU.

glass

Generator for Large Scale Structure

classy-szlite

Fast, differentiable cosmology in pure JAX. CMB Cls, matter Pk (linear/nonlinear), distances, derived parameters, and halo-model tSZ Cl^yy — backed by the v2 CosmoPower emulators used in the ACT DR6 extended-cosmology analyses.

inflatox

Framework for implementing high-performance numerical consistency conditions for multifield inflation models.

hostphot

HostPhot: global and local photometry of galaxies hosting supernovae or other transients

supernnova

Open Source Photometric classification https://supernnova.readthedocs.io

pyhalomodel

A pure Python halo-model implementation for power spectra of any large-scale structure tracer combination.

cosmoglobe

The Cosmoglobe Sky model. A Python package for producing astrophysical sky simulations directly from Commander results.

isitgr

Code for Anisotropies in the Microwave Background

jaxtronomy

JAX port of lenstronomy, for parallelized, GPU accelerated, and differentiable gravitational lensing and image simulations.

nbodykit

Analysis kit for large-scale structure datasets, the massively parallel way

pocomc

pocoMC: A Python implementation of Preconditioned Monte Carlo for accelerated Bayesian Computation

classylss

a lightweight Python binding of the CLASS CMB Boltzmann code

picca

set of tools for continuum fitting, correlation function calculation, cosmological fits...