OpenTalk

What Is OpenTalk?

Berlin's city administration needed a video conferencing platform. Not a commercial SaaS that stored data in Virginia. Not an open-source tool held together by volunteer patches. A platform built for government requirements: formal moderation, audit-proof voting, minute-taking, and absolute data sovereignty on German servers. No existing solution met every requirement. So Berlin commissioned one.

Heinlein Support GmbH, a Berlin company with over 30 years of experience operating secure email and communication infrastructure, took the brief and built OpenTalk. Development began around 2019. The platform launched publicly as a cloud service and was subsequently released as open-source software under the EUPL (European Union Public Licence) on OpenCoDE.de, Germany's repository for public-sector open-source code.

The project's government origins show in every feature choice. Agenda management, roll call, audit-proof voting, and meeting minutes are first-class features, not afterthoughts bolted onto a consumer video tool. The state of Thuringia adopted OpenTalk for its entire administration. Other German federal agencies and municipalities followed. The platform has since expanded beyond government to serve enterprises and educational institutions that share the same sovereignty requirements.

OpenTalk GmbH now operates the commercial cloud service, while the open-source codebase remains freely available. Organisations can self-host on their own servers using Docker or Kubernetes, scaling from small installations to large-scale deployments handling hundreds of concurrent conferences.

Key Features

Governance-First Design

OpenTalk treats meetings as formal proceedings, not casual conversations. Moderators set agendas before conferences begin. Participants see structured topics with time allocations. Roll call verifies attendance. Voting can be configured as anonymous or named, with results that meet audit-proof standards for governmental decision-making.

Meeting minutes capture decisions, action items, and vote outcomes in a structured format. For city councils, board meetings, and parliamentary committees, these features replace manual minute-taking with integrated tooling. No commercial video platform offers this governance depth natively.

Subroom Audio

Version 25.3.0 introduced subroom audio, allowing participants to hold confidential side conversations during a main conference without disrupting it. Unlike breakout rooms that require moderator setup and participant reassignment, subroom audio creates temporary audio channels within the existing meeting. Participants move fluidly between the main room and sub-discussions.

This feature addresses a genuine gap in video conferencing. Committee meetings, hearings, and multi-party negotiations often require brief private consultations. OpenTalk handles this without ending and restarting sessions.

Recording and Live Streaming

OpenTalk supports GDPR-compliant recording with participant consent management. Before recording activates, every participant receives a notification. Those who decline consent are excluded from the recording. Recordings store on the platform's German servers.

Live streaming capabilities, introduced in version 25.3.0, enable broadcasting conferences to wider audiences. Public council meetings, training sessions, and organisational events can reach participants beyond the direct attendee list. This extends OpenTalk from a meeting tool into a broadcasting platform for institutional use.

Self-Hosting and Scalability

The EUPL-licensed source code runs on standard Docker containers and scales through Kubernetes orchestration. Small installations work on a single root server. Enterprise deployments handle hundreds of concurrent conferences across clustered infrastructure. The Enterprise Edition adds advanced features like high-availability configurations and enterprise-grade scaling.

Self-hosting gives organisations complete control over their infrastructure. Data never touches external servers. Security teams can audit every line of code. Update schedules follow internal change management rather than vendor release cycles.

Accessibility Certification

OpenTalk received the BITV 2.0 seal in 2025, certifying compliance with Germany's highest digital accessibility standards. This certification is particularly important for government and public-sector use, where accessibility is a legal requirement rather than a best practice. Screen reader compatibility, keyboard navigation, and visual contrast requirements all meet certified standards.

Pricing

OpenTalk's free Starter plan includes 5 participants and 30-minute calls. This is functional for testing but too limited for production use. Real adoption begins at the Standard tier: EUR 7.50 per user per month for 50-participant conferences lasting up to 4 hours, with breakout rooms, recording, and team management.

The Premium tier at EUR 12.50 per user per month unlocks 200 participants, unlimited duration, anonymous voting, roll call, phone dial-in, and an Outlook plug-in. Annual billing saves two months across both paid tiers.

Enterprise pricing is custom and covers on-premise deployment, dedicated support, custom SLAs, and Kubernetes-based scaling. For government and large enterprise deployments, the Enterprise tier provides the procurement structure and support guarantees that institutional buyers require.

Compared to Zoom's Pro plan at EUR 13.33 per user per month, OpenTalk's Premium tier at EUR 12.50 delivers governance features Zoom lacks entirely. The trade-off is fewer consumer-oriented features and a smaller integration ecosystem.

EU Compliance & Privacy

OpenTalk's compliance posture starts with infrastructure: all cloud-hosted instances run on dedicated servers in Germany. Not shared hosting. Not a US cloud provider's EU region. Dedicated German servers owned and operated by a German company.

The platform provides GDPR-compliant AV (audio-visual processing) contracts suitable even for professionals bound by confidentiality obligations: lawyers, doctors, tax advisors, and auditors. This level of contractual coverage goes beyond standard DPAs.

The EUPL licence ensures that any organisation can audit the source code for security vulnerabilities, backdoors, or compliance issues. This transparency is increasingly important as EU regulations move toward requiring open-source auditing for public-sector software procurement.

The BITV 2.0 accessibility certification adds compliance with Germany's Barrierefreie-Informationstechnik-Verordnung, mandatory for federal government digital services.

Who It's Best For

Government and public-sector organisations that need audit-proof voting, formal agendas, and meeting minutes alongside GDPR-compliant video. OpenTalk was built for this use case from day one.

Enterprises in regulated industries (legal, healthcare, finance) where professional confidentiality requirements mandate German or EU-only data hosting and auditable infrastructure.

Organisations committed to digital sovereignty that want open-source, self-hostable video conferencing under a European licence. The EUPL ensures no proprietary lock-in.

Educational institutions conducting formal examinations, committee meetings, or board proceedings where structured moderation and accessibility compliance are requirements.

The Verdict

OpenTalk fills a gap that commercial video platforms ignore: formal, sovereignty-first video conferencing with governance features built into the core. The audit-proof voting, agenda management, and meeting minutes address real requirements in government and enterprise settings. The open-source EUPL licence and self-hosting option provide control that no proprietary platform can match. Consumer polish, third-party integrations, and casual-use features lag behind Zoom and Google Meet. OpenTalk is not trying to replace them for daily team standups. Where formal proceedings, data sovereignty, and open-source transparency are mandatory, OpenTalk delivers capabilities that no alternative combines.

Frequently Asked Questions

Is OpenTalk GDPR compliant?

Yes. OpenTalk is developed by Berlin-based Heinlein Support GmbH and hosted on dedicated German servers. The platform provides GDPR-compliant AV contracts suitable for professionals bound by confidentiality obligations. Self-hosting eliminates external data processing entirely.

Can OpenTalk be self-hosted?

Yes. The source code is published under the EUPL licence on OpenCoDE.de. Deployment uses Docker containers, scalable via Kubernetes. Installations range from single-server setups to enterprise clusters handling hundreds of concurrent conferences.

How does OpenTalk compare to Zoom?

OpenTalk offers open-source transparency, German-only hosting, and governance features (audit-proof voting, agendas, minutes) that Zoom lacks entirely. Zoom has a far larger ecosystem, more polished consumer experience, and broader integrations. OpenTalk targets organisations where digital sovereignty and formal proceedings are requirements.

Is OpenTalk free to use?

The Starter plan is free with 5 participants and 30-minute limits. Paid plans start at EUR 7.50 per user per month (Standard) with 50 participants and 4-hour calls. The open-source code can be self-hosted at no licence cost.

Which government organisations use OpenTalk?

OpenTalk originated as a project for the city of Berlin and has been adopted by the state administration of Thuringia. The platform serves German federal agencies, municipalities, and public-sector organisations requiring sovereign video infrastructure.