Free, open-source application for identification of features from mass spectra.


  • Fast identification of peptide or protein-like features
  • Deconvolves overlapping ion signals
  • Customizable for heavy isotopes and experimental labels
  • Supports mzXML, mzML, RAW files, and more

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Current Release

Version 2.3.0

Released on Aug 14 2015. Get your copy from our Downloads page.

Featured Applications

Hardklör is found in many published experiments and software pipelines. Read more about its many applications.

August 17, 2015

Aug 17 2015

Compiled versions of last friday's official release of 2.3.0 have been added to the website. The newest version is mostly minor bug fixes. The versioning system ...