Hail is an open-source, general-purpose, Python-based data analysis tool with additional data types and methods for working with genomic data.

Hail is built to scale and has first-class support for multi-dimensional structured data, like the genomic data in a genome-wide association study (GWAS).

Hail is exposed as a Python library, using primitives for distributed queries and linear algebra implemented in Scala, Spark, and increasingly C++.

See the documentation for more info on using Hail. Post to the Discussion Forum for user support and feature requests. Chat with the Hail team and user community in Hail's Zulip chatroom.

Hail is actively developed with new features and performance improvements integrated weekly. See the changelog for more information.


Hail is maintained by a team in the Neale lab at the Stanley Center for Psychiatric Research of the Broad Institute of MIT and Harvard and the Analytic and Translational Genetics Unit of Massachusetts General Hospital.

Contact the Hail team at hail@broadinstitute.org.

Citing Hail

If you use Hail for published work, please cite the software. You can get a citation for the version of Hail you installed by executing:

import hail as hl


Which will look like:

Hail Team. Hail 0.2.13-81ab564db2b4. https://github.com/hail-is/hail/releases/tag/0.2.13.

Or if you need a bibtex entry:

import hail as hl


Which will look like:

  author = {Hail Team},
  title = {Hail},
  howpublished = {\url{https://github.com/hail-is/hail/releases/tag/0.2.13}}

If you simply cannot stomach the idea of citing a GitHub repository (even though more than 2,800 people have cited the Keras GitHub repository), then please cite this DOI which always points to the latest published version of Hail:

Hail Team. Hail. http://doi.org/10.5281/zenodo.2646680

The Hail team has several sources of funding at the Broad Institute:

We are grateful for generous support from:

We would like to thank Zulip for supporting open-source by providing free hosting, and YourKit, LLC for generously providing free licenses for YourKit Java Profiler for open-source development.