pyredshift is an open-source Python library that provides interactive tools for determining redshifts from 1D astronomical spectra. It is the Python successor to pdlredshift/redshift.f and is designed for astronomers working with spectral data. The package offers a command-line interface and supports modern Python workflows.
In the Frameworks & SDKs space, pyredshift takes a focused approach. It enables astronomers to interactively determine redshifts from 1D spectral data using Python. It is built as an open-source project for astronomers. pyredshift is open source under the MIT license. pyredshift is available on the command line.
It is developed by Karl Glazebrook, and the product first shipped in 2026. Development happens publicly on GitHub with 30 commits in the last 90 days. Key capabilities include interactive redshifting, spectra analysis, and astronomical data support.
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