grommunio Web
🇦🇹 AT · Free plan · paid from €1.99/user/mo
Open-source Exchange alternative with email, calendar, chat and video in one web client
Replaces
grommunio Web is sought as a European alternative to:
Features
- Webmail with S/MIME and OpenPGP signing and encryption
- Outlook-compatible color categories
- Sticky notes on messages
- BIMI sender logos
- Undo/redo for supported actions
Calendar
- Shared calendars and delegation
- Free/Busy scheduling suggestions
- Invitations with participant tracking
- Recurring events with exceptions
Contacts, tasks and notes
- Contact and address-book management
- Task and task-request support
- Notes
Collaboration plugins
- Files: browse, upload, preview, share and attach documents
- Chat: direct and channel-based messaging with file sharing
- Meet: start video meetings or add meeting links to appointments
Sharing and access
- Shared folders and mailboxes
- Permissions
- Delegate access
Web-client utilities
- Search
- Command palette
- Keyboard shortcuts
- Desktop notifications (optional)
Pricing
- Community self-support
- No vendor support
- Complete grommunio platform
- All features included
- Complete grommunio platform
- All features included
- Complete grommunio platform
- All features included
- Complete grommunio platform
- All features included
Plans differ by user count and support level. Online demo and trial version available for evaluation.
EU Trust Profile
What we verified against public sources, last checked 2026-10-29. Every point links to its evidence.
- Evidence →EU data residency
Customers can self-host or choose a European hosting partner; grommunio itself does not store customer data.
- Evidence →European legal entity
Registered in Austria under FN 538037g at the Commercial Court of Vienna.
- Evidence →Self-hosting availableOn-premises, private cloud, or container deployments
Customers can deploy grommunio on their own infrastructure.
- Evidence →Open source
Full platform source code is published on GitHub and Codeberg.
- Evidence →Documented data export
Administrator-oriented backup, migration, and restore tools are documented.
- Evidence →Local-language support
Contractual and business language is German; support is provided via certified partners.
We list only what we could verify against a public source on the check date. A point that is absent was not established either way — it is not a finding against the vendor. The vendor's own information prevails.
Work at grommunio Web?
This badge is free for every vendor we list and has no bearing on the order of any list. It is issued on the basis of a verified European headquarters (AT) and the compliance points we checked against public sources — the date on it is the date we last checked.
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Reviews
Recurring themes, synthesized from public reviews across portals.
What users value
- Strong Outlook and Exchange compatibility via MAPI/HTTP, EWS, ActiveSync, IMAP, CalDAV/CardDAV
- Responsive performance compared to Zimbra in high-volume mailbox tests
- Groupware features like shared mailboxes, public folders, calendars and contacts
- Migration tools for onboarding existing data
Where users see room to improve
- · Outlook category synchronization issues across multiple clients (colors missing in grommunio Web)
- · Community Edition limited to five users, paid subscription required beyond that
Integrations
grommunio Web: frequently asked questions
- How much does grommunio Web cost?
- grommunio Web has a free plan; paid plans start at €1.99/user/mo. Plans: Basic (€1.99/user/mo), Plus (€3.99/user/mo), Business (€5.49/user/mo). Plans differ by user count and support level. Online demo and trial version available for evaluation.
- Which tools does grommunio Web integrate with?
- grommunio Web connects with WebDAV, Seafile, OpenStreetMap, OnlyOffice, Jitsi, Piler, Rspamd and Active Directory, plus 4 more integrations we found.
- Where does grommunio Web store its data?
- Customers can self-host or choose a European hosting partner; grommunio itself does not store customer data.
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Feature, pricing and integration details are based on web research (as of 2026-10-29), without guarantee, errors are possible. The vendor's website prevails.