Mass++/Mass++4: An Open Source MS Data Viewer

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About Mass++/Mass++4

We have been developing a fast spectrum viewer, Mass++, which has been downloaded about 20000 times to date in total of all releases. The version currently under development is Ver.4, which is open-source software, newly rewritten in the Java language to be compatible with multiple operating systems. This time, we have organized the various functions that have been developed to date and generated a package as the official release of Ver. 4 (Ver.4 Gold), focusing on basic functions, especially those related to the display of spectra and chromatograms, such as zooming of spectra/chromatograms, labeling of peaks, exporting of spectra/chromatograms to image files, and functions to narrow down spectra by m/z values and retention time values. This Ver.4 Gold package will be released in four operating system environments: Windows, MacOS, Linux Debian/Ubuntu, Linux RPM.

Note that 'Mass++ Ver.4 Gold' has been renamed to 'Mass++4 Ver.1.0.0' upon release for future version management and to distinguish it from the Ver.2.7 series. We will primarily use this name going forward.

Binary package (Installer) downloads

Current (Latest) version

Ver.4 (Mass++4) Series (Latest Build) Download page (Windows, macOS, Linux RPM, Linux Debian/Ubuntu versions)

• Mass++4 ver.1.0.0 (a.k.a. Mass++ ver.4 Gold (stable) version)
  • Mass++4 is the version that had been under development as “Mass++ ver.4.” It was renamed for several reasons: to avoid confusion since many users still use ver.2.7.4, and because there are significant functional differences. “Mass++4 ver. 1.0.0” is identical to the version referred to during development as “Mass++ ver.4 Gold (Final Release)”. Development is currently focused solely on this version.

Previous versions

Ver.4 (Mass++4) Series (ver.0.2.1 and earlier) Download page (Windows, macOS, Linux RPM, Linux Debian/Ubuntu versions)

• Mass++4 ver.0.2.1 (a.k.a. Mass++ ver.4 beta2)
• Mass++4 ver.0.2.0 (a.k.a. Mass++ ver.4 beta)
• Mass++4 ver.0.1.0 (a.k.a. Mass++ ver.4 alpha)

Ver.2 Series Download page (Windows version only)

• Versions 2.7.4 and 2.7.5 are both based on outdated development environments, so we cannot provide any bug fixes or support. Use at your own risk.

• Mass++ ver.2.7.5

  • Mass++ has released only executable files as a closed-source software up to version 2.7.4. Version 2.7.5 is an open-source version created by removing some features from version 2.7.4.

• Mass++ ver.2.7.4

  • Mass++ version 2.7.4, the original final version of the ver.2 series, includes numerous features such as analysis functions and is still used by many users today. This file is identical to the one distributed on the website of Shimadzu Corporation's Koichi Tanaka Mass Spectrometry Research Laboratory until March 31, 2025. Shimadzu Corporation is not involved in any way with the distribution on this site and provides no support whatsoever for this version.

Source code repositories

• current (latest) version

  • Mass++4 ver.1.0.0 (a.k.a. ver. 4.0 Gold (stable))
    • mspp4-core
    • mspp4-desktop
    • api-sample (Sample codes for data processing API)

• previous versions

  • ~Mass++4 ver.0.2.1 (ver.4.0 beta2)
  • Mass++ ver.2.7.5
  • Version 2.7.4 is closed-source (source code not publicly available).

Release notes

• 2026/02/23: Mass++4 ver.1.0.0 (Mass++ ver.4.0 Gold) release
  • Updated whole system to apply new concept
  • Re-implemented basic functions
• 2021/12/04: Mass++4 ver.0.2.1 (Mass++ ver.4.0 beta2) release
  • Bug-fixed for beta version
    • To display precursor ion in MS/MS spectra properly
    • To execute peptide identification process from Project tab properly
    • To generate peak list of peptide identification properly for macOS/Linux
• 2020/06/08: Mass++4 ver.0.2.0 (Mass++ ver.4.0 beta) release
  • Added some features from alpha version
    • Run external applications / Data exchange
    • Data annotation view
    • Peak picking
      • Using ProteoWizard ver. 3.0.20123 (only for Windows)
    • Search engine for peptide annotations
      • Using Comet ver. 2019.01 rev. 5 (only for Windows)
    • File support
      • mzML, MGF, pepXML (manual)
• 2019/09/17: Mass++4 ver.1.0.0 (Mass++ ver.4.0 alpha) release
  • Released new version for multi platform
  • Implemented basic functions
    • Spectrum/Chromatograms view
      • TIC, XIC, MS1, MS/MS
      • Mirror view
      • Overwrap
    • Heatmap
      • 2D, 3D
    • Data annotation view (manual)
    • File support
      • mzML, MGF, pepXML (manual)
    • OS support
      • Windows, macOS

About us

See the pages of Mass++ Users Group (https://mspp.ninja/?lang=en_us)

Page updated: XXXX. XX, 2026