The RCV Universal Tabulator, RCVUT, is federally tested open-source software that can tally RCV election results using cast vote records from most voting system vendors. In addition, RCVUT can combine results from multiple different voting systems into one complete final result and can be used to audit RCV results generated by other voting systems. The RCV Universal Tabulator is the most comprehensive RCV tabulation module [CH1] to be tested under the Voluntary Voting System Guidelines (VVSG) and the first open source software to meet VVSG standards. Download the software along with instructions on how to install and use the tabulator by following the link at the bottom of this page.
The Tabulator is currently used to produce RCV official results, as a testing tool, or as an auditing tool. The State of Utah has certified the RCVUT for use in local RCV elections, and the State of Michigan certified RCVUT for use in Eastpointe, Michigan’s RCV elections. The Democratic Parties of Alaska, Kansas, and Wyoming used RCVUT to produce district- and county-level results in their 2020 Presidential Preference Primaries using RCV. The Voting Methods Working Group of the NIST and EAC VVSG 2.0 development process accepted the RCVUT as a reference implementation to demonstrate all relevant variants of RCV tabulation. Benton County, Oregon also used RCVUT as a verification tool in the testing and certification process for the RCV tabulation software provided by its voting system vendor. Successful replications of past RCV election results have been run on results in Minneapolis, Minnesota and the State of Maine. RCVUT successfully tallied RCV elections for the Student Government Association at the University of Houston in January 2019.
The Universal RCV Tabulator has been certified by Pro V&V, Inc., an EAC-accredited voting systems test lab (VSTL) is available under an aGPLv3 License.
A visualizer, which uses JSON files produced by the Universal RCV Tabulator, is also available.
If you are interested in using the tabulator for a ranked choice voting election, email us at firstname.lastname@example.org and we can provide the support you need to use it in your jurisdiction.