Belenios

What it does

Authentication

The hosted platform supports public accounts, Google login, and CAS authentication.checked 8 Oct 2026

Election setup limit

Voters cannot be added and their email addresses cannot be changed after an election starts; the stated remedy is to start the election again.checked 8 Oct 2026

High-stakes suitability

The FAQ says Belenios does not protect against stronger coercion where voters may be forced to disclose credentials or passwords, and describes high-stakes online voting security as an unresolved challenge.checked 8 Oct 2026

Hosted service limit

The hosted platform allows up to 2500 voters per election; the site suggests institutional hosting for elections above that limit.checked 8 Oct 2026

Maintainers

The free online platform is maintained by Véronique Cortier and Pierrick Gaudry, and the about page says software development moved to a startup independent of the research teams starting in 2025.checked 8 Oct 2026

Privacy data

The GDPR page says Belenios processes language and session cookies, email addresses used for voting material and confirmation, encrypted ballots, and connection information and vote dates.checked 8 Oct 2026

Purpose

Belenios is a verifiable online voting system for elections and referendums, including elections for scientific councils and sports associations.checked 8 Oct 2026

Self-hosting

Belenios is free software licensed under the GNU Affero General Public License version 3, and its source code can be downloaded to run a voting server.checked 8 Oct 2026

Support

The platform is provided as is, has no hotline, and directs users to its FAQ and discussion mailing list for questions.checked 8 Oct 2026

Trustee security

The setup guide recommends trustee-managed shared decryption keys; if a trustee key is lost, the election cannot be tallied and is canceled.checked 8 Oct 2026

Verifiability

Voters can check that their ballots appear in the public ballot box, and anyone can verify that the result corresponds to the ballots.checked 8 Oct 2026

Voting methods

The hosted platform supports standard candidate selection and preferential elections using Condorcet, Single Transferable Vote, and Majority Judgment.checked 8 Oct 2026

Voting privacy

The system encrypts votes so that no one can learn an individual voter's vote, subject to the election's decryption-key setup.checked 8 Oct 2026

Weighted votes

Weighted votes are supported for standard elections only.checked 8 Oct 2026