The Community Intercomparison Suite (CIS) is an easy-to-use command-line tool which has been developed to allow the straightforward intercomparison of remote sensing, in-situ and model data. Developed by a professional software company, CIS supports a large number of gridded and ungridded data sources `out-of-the-box', including climate model output in NetCDF or pp file format, CALIOP, CloudSat, MODIS, Cloud and Aerosol CCI level 2 satellite data, and a number of other in-situ aircraft and ground station datasets. The open-source architecture also supports user defined `plugins' to allow many other sources to be easily added. Many of the key operations required when comparing heterogenous datasets are provided by CIS, including subsetting, aggregating, collocating and visualising the data. Output data is written to CF-compliant NetCDF files to ensure interoperability with other tools and systems. The latest documentation, including a user manual and installation instructions can be found on our website (http://cistools.net).