Welcome to Newt Pathway Viewer & Editor

Newt is a free, web based, open source viewer and editor for pathways in Systems Biological Graphical Notation (SBGN) and Simple Interaction Format (SIF). It was written with a series of libraries and extensions based on Cytoscape.js with utmost customization in mind.


What distinguishes Newt from other viewers and editors for biological maps can be summarized as:

  • Rich and refined, yet easy-to-use web based UI
  • Convenient construction and annotation of pathways from scratch as well as viewing and editing existing maps
  • Full support for compound structures (including automatic layout) to properly represent compartments, molecular complexes, and sub-maps
  • Semantic validation and guided fix for SBGN PD maps
  • State-of-the-art complexity management capabilities through hide-show or highlight parts of a map and collapse-expand compound structures
  • Advanced diagramming through interactive move, resize, and styling of map objects including color schemes, re-routing and re-connection of interactions, and grid & alignment guideline support
  • Facilities for querying, viewing, and editing pathways in Pathway Commons
  • Conversion to and from CellDesigner and SBML file formats
  • Launching with a remote SBGN model specified as a URL (example) or as a URI (example)

Source code

Newt source code can be found on this Github repository.


Newt is distributed under GNU Lesser General Public License. See here for third-party libraries used.

Browser compatibility

Newt is expected to work on most major browsers with recent releases without any prior installation or set up.


Newt is mainly developed and maintained by i-Vis Research Lab in collaboration with the Demir Lab at OHSU. EISBM contributed to the project in the past.