Ultrahigh-Resolution Mass Spectrometry Data Evaluation for Complex Organic Matter R package ume version 1.7.1 Provides tools for assigning molecular formulas from exact masses obtained by ultrahigh-resolution mass spectrometry. The methodology follows the workflow described in Leefmann et al. (2019) <doi:10.1002/rcm.8315>. The package supports the inspection, filtering and visualization of molecular formula data and includes utilities for calculating common molecular parameters (e.g., double bond equivalents, DBE). A graphical user interface is available via the 'shiny'-based 'ume' application. Software Depends: R (>= 4.2.0) Imports: data.table, ggplot2 (>= 3.5.0), plotly, vegan, viridis, jsonlite Suggests: rmarkdown, knitr, testthat (>= 3.0.0), xml2, pdftools, KEGGREST, zCompositions Boris Koch <boris.koch@awi.de> Comprehensive R Archive Network (CRAN) Boris Koch [aut, cre] (ORCID: <https://orcid.org/0000-0002-8453-731X>), Stephan Frickenhaus [ctb] (ORCID: <https://orcid.org/0000-0002-0356-9791>), Shuxian Gao [ctb] (ORCID: <https://orcid.org/0009-0004-7819-7525>), Oliver Lechtenfeld [ctb] (ORCID: <https://orcid.org/0000-0001-5313-6014>), Tim Leefmann [ctb] (ORCID: <https://orcid.org/0000-0002-5784-8657>), Fabian Moye [ctb] (ORCID: <https://orcid.org/0000-0002-4632-5033>) MIT + file LICENSE (https://CRAN.R-project.org/package=ume/LICENSE) 2026-07-14 application/tgz https://CRAN.R-project.org/package=ume doi:10.32614/CRAN.package.ume