9 Best European Microsoft Office Alternatives in 2026
The best European alternative to Microsoft Office in 2026 is Nextcloud, based in Germany. All 9 options below are European-owned, GDPR-native and ranked by feature parity and relevance.
By the EU Alternatives team Last updated
Our top pick this year is Nextcloud, but every option on this list is European-owned, GDPR-native, and production-ready. Worth a closer look: Infomaniak kSuite, Leviia Next, mosa.cloud, ONLYOFFICE.
Microsoft Office alternatives are mainly Office & Collaboration, Cloud & Hosting, and Messaging & Chat. Browse any of those categories for a wider shortlist beyond this list.
Top European Microsoft Office alternatives compared
| # | Alternative | Country | Open source | Free tier | Compare |
|---|---|---|---|---|---|
| 1 | Nextcloud | Germany | Yes | Yes | vs Microsoft Office → |
| 2 | Infomaniak kSuite | Switzerland | No | Yes | vs Microsoft Office → |
| 3 | Leviia Next | France | No | No | vs Microsoft Office → |
| 4 | mosa.cloud | Netherlands | No | No | — |
| 5 | ONLYOFFICE | Latvia | No | No | — |
-
Achieve data sovereignty with a self-hosted content collaboration platform. Features file sync, chat, video calls, groupware, and an online office suite.
Nextcloud is Germany's most widely deployed open-source collaboration platform, letting organisations run their own private cloud for file sync, video calls, email, and document editing on their own servers. With 400,000+ active deployments reaching tens of millions of users, it is the definitive European alternative to Microsoft 365 and Google Workspace.
The platform combines Nextcloud Files (storage and sync), Nextcloud Talk (chat and video), Nextcloud Groupware (calendar and contacts), and Nextcloud Office (real-time document editing) in a single installation. A REST API and 300+ marketplace apps extend it with LDAP, SAML, SharePoint, and hundreds of third-party integrations.
Key benefits:
- File sync and share across Windows, macOS, Linux, iOS, and Android clients
- Nextcloud Talk for end-to-end encrypted video calls and chat with no external service
- Nextcloud Office with real-time collaborative document, spreadsheet, and presentation editing
- Built-in AI assistant running locally with no data leaving your infrastructure
- 300+ marketplace apps for CRM, project management, e-signing, and more
- Full self-hosting on bare metal, VMs, Docker, or Kubernetes
- Enterprise edition with professional support, compliance tooling, and SLA guarantees
Developed and maintained by Nextcloud GmbH in Stuttgart, Germany, all data stays on infrastructure you control, with no third-party cloud involved. The platform is GDPR-native, supports HIPAA-capable configurations, and is used by major EU governments, universities, and public institutions that mandate on-premises data sovereignty.
Trusted by Siemens, the German Government, and thousands of public sector organisations across Europe, with 20,000+ GitHub stars and an active global community.
-
Complete productivity suite bundling mail, cloud drive, office documents, video meetings, team chat, and a sovereign AI assistant, hosted exclusively in Switzerland.
Infomaniak kSuite is the Swiss answer to Google Workspace: mail, cloud drive, office documents, video meetings, and team chat in one integrated suite, developed and hosted exclusively in Switzerland by a company that has built its own data centers since 1994. Infomaniak states plainly: your data is protected by Swiss law and the GDPR, hosted and processed exclusively in Switzerland.
The suite bundles Mail with built-in encryption, kDrive collaborative storage with online document editing, kMeet video conferencing, kChat team messaging, SwissTransfer for files up to 50 GB, and Euria, a sovereign AI assistant integrated across the apps. The free my kSuite tier includes a lifetime email address with 20 GB and 15 GB of kDrive storage.
Key features:
- Full suite with mail, drive, docs, meetings, chat, and file transfer
- Sovereign AI assistant integrated into mail and documents
- Free for life tier with 20 GB mail and 15 GB drive storage
- Swiss-only hosting in Infomaniak's own data centers
- ISO 27001 certified since 2018, plus ISO 9001, 14001, and 50001
- Employee and foundation owned, with no outside shareholders to serve
- Pro plans from under 2 francs per user per month
kSuite is operated by Infomaniak Network SA, Geneva, Switzerland, serving more than a million customers, compliant with GDPR and the Swiss FADP. The entire value chain, from hardware to software, stays under Swiss control.
Ideal for companies and individuals replacing Google Workspace with a suite whose privacy promises are structural, not contractual.
-
French collaborative platform based on Nextcloud open-source. Document editing, chat, video calls, and file sharing hosted on sovereign cloud infrastructure.
Leviia Next is a French collaborative workspace built on Nextcloud combining file sync and share, calendars, contacts, video meetings, chat, office documents and tasks in a single sovereign platform. Operated by Leviia, a French cloud provider headquartered in Le Havre, it targets businesses and public-sector organisations that need a Microsoft 365 or Google Workspace replacement hosted entirely in France.
The platform pairs the open-source Nextcloud Hub with Leviia's managed operations, S3-compatible object storage and datacentre infrastructure. Users get familiar web, desktop (Windows, macOS, Linux) and mobile clients, real-time co-editing through Collabora Online, integrated Nextcloud Talk for chat and calls, and client-side encryption options for sensitive folders.
Key benefits:
- File sync and share across Windows, macOS, Linux, iOS and Android clients
- Real-time co-editing of documents, spreadsheets and presentations via Collabora Online
- Nextcloud Talk for chat, audio and video conferencing with screen sharing
- Calendars, contacts and mail with CalDAV, CardDAV and standards-based sync
- End-to-end encrypted folders for sensitive data with client-managed keys
- Managed operations including updates, backups and 24/7 French-speaking support
- Open-source core (AGPLv3) with no vendor lock-in on file formats or data export
Leviia Next is headquartered in Le Havre, France, with data centres located in France under GDPR and French CNIL oversight. ISO 27001 certification, SecNumCloud alignment, a full DPA and contractual exclusion of any non-EU sub-processor are standard on every plan.
Ideal for French and European organisations, including public administrations, healthcare providers and regulated industries, that need a sovereign, Nextcloud-based alternative to Microsoft 365 or Google Workspace hosted entirely under French jurisdiction.
-
Complete EU-hosted workspace with Docs, Meet, Drive, Mail & AI. Pay for usage, not seats. Open source foundation with no vendor lock-in.
mosa.cloud is a Dutch collaborative workspace whose mail module delivers team email with shared inboxes alongside docs, drive, video meetings, chat and spreadsheets. Named after the Mosa (Meuse) river in Maastricht, it positions itself as a sovereign alternative to Google Workspace and Microsoft 365 rather than a standalone inbox, so the email experience is tightly woven into the rest of the suite.
The stack is built on top of La Suite Numérique, the open-source workspace developed jointly by the French, German and Dutch governments and already used by over 200,000 French public servants. Mail ships with AI-assisted organisation, shared team inboxes, federated Matrix-based chat via Element, Collabora-powered document editing and kDrive-style file storage, all under one pay-per-usage billing model.
Key advantages:
- Shared team inboxes route support and sales mail to a group rather than a person
- AI-assisted triage summarises threads and surfaces the messages that actually need you
- Integrated Docs, Drive, Meet and Chat remove the need for parallel Google or Microsoft accounts
- Pay-per-usage pricing replaces per-seat licensing and scales with real storage and compute
- Open formats keep documents, spreadsheets and mail portable if you ever migrate away
mosa.cloud is operated from the Netherlands and runs entirely on EU-hosted infrastructure, meaning data never leaves European jurisdiction. Security controls are built to NIS2 expectations, and the underlying La Suite Numérique codebase is already trusted at national-government scale for sovereign communications.
For teams that want to replace the full Gmail-plus-Docs-plus-Meet bundle with something European, open-source and transparently priced, mosa.cloud is one of the most coherent options available.
-
Open-source online editor for documents, spreadsheets, presentations, and PDFs. Features real-time collaboration, AI integration, and accessibility tools.
Latvian open-source office suite for documents, spreadsheets, presentations, and PDFs, with real-time collaboration, AI integration, and accessibility tools.
-
Transform document collaboration with real-time editing, version control, and secure sharing features that enhance team productivity and communication.
Real-time co-editing with version control and secure sharing, French-built to keep teams writing together. Track changes and collaborate on documents in one place.
-
Unify company operations. Build custom workflows, connect teams, and manage projects, documents, and data all in one adaptable, interconnected platform.
Polish workspace that unifies company operations: build custom workflows and connect teams while managing projects, documents and data in one adaptable system.
-
Take secure notes and collaborate in real time with encrypted docs, offline access, comments, and rich text support.
UK app for secure, encrypted note-taking and real-time collaboration, with offline access, comments and rich text support.
-
Organize notes, docs, and tasks with an AI-powered collaborative workspace. Features real-time editing, integrated task management, and automatic knowledge linking.
UK workspace that ties notes, docs and tasks together with AI, offering real-time editing, built-in task management and automatic links between related knowledge.
