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Advanced online election counting

Count instant runoff and single transferable vote elections for free, no downloads or sign-up required

Screenshot of OpenTally

Key features

Runs in your browser

No downloads or sign-ups are required. OpenTally counts are computed entirely inside your browser, and no data ever leaves your computer.

Wide range of STV systems

OpenTally supports Gregory (inclusive and exclusive, weighted and unweighted), Meek and Wright variants of the single transferable vote.

Support for arbitrary constraints

OpenTally is the only publicly available election counting software to support arbitrary combinations of constraints, such as gender quotas and other affirmative action requirements.

Free and open source

Source code for OpenTally is publicly available under the GNU AGPLv3.

From our blog

Latest news and posts from the OpenTally blog

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