2 audited open-source messaging apps from European providers
Open source messaging apps lets reviewers inspect available source code. That can support security and privacy assessments, but it does not reveal every deployment, configuration, subprocessor, or hosted-service practice. Verify those operational details separately.
License terms and technical design may make migration, self-hosting, or customization easier. Actual portability and control depend on the product, deployment model, dependencies, and your team's operational capacity.
Some open source messaging apps tools support self-hosting, which can give your organization more control over deployment and data location. 2 of the 2 tools on this page are explicitly marked as self-hostable. Verify the documentation, dependencies, and operational controls before relying on self-hosting for residency or compliance requirements.
Open source means source code is available under a license; it does not always mean the hosted service is free. Products such as Element, Wire may offer free tiers or community editions and charge for hosting, enterprise features, or support. Source review can inform an assessment, but deployment, configuration, subprocessors, and service operations also need verification.
The best choice depends on your requirements. Top-rated options include Element, Wire. For enterprise use, look for support, SLA terms, SSO, audit logging, security documentation, and data-processing terms. European headquarters alone does not establish GDPR compliance or hosting location; verify those details with each provider and seek legal advice where needed.
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