Colanode, Group Office, and SOGo are all free-to-self-host, open-source tools for teams that want to own their collaboration infrastructure instead of renting…
Best for: IT teams and hosting providers that need a lean, standards-based webmail and calendar server proven at scale with thousands of mailboxes
At a Glance
Colanode
Group Office
SOGo
Primary category
Collaboration
Collaboration
Collaboration
Rating
Not documented
Not documented
Not documented
Pricing model
Free
Open Source, Freemium (free self-hosted Community edition plus paid cloud and add-ons)
open-source
Starting price
Free (self-hosted or free beta cloud)
Free (self-hosted); Online plan from $12/month
Free
Free plan
Yes
Yes
Not documented
Free trial
Not documented
Yes
Not documented
Platforms
Web, iOS, Mac, Windows
Web, iOS, Android, Mac, Windows
Web, iOS, Android
Team collaboration
Not documented
Not documented
Not documented
AI features
Not documented
Not documented
Not documented
Public API
Not documented
Yes
Yes
Standout Differences
Local-first, CRDT-powered sync
Colanode writes every change to a local SQLite database first and syncs in the background using Yjs CRDTs, so it stays fast and usable offline in a way the other two, which are traditional server-side apps, are not.
Colanode
The broadest built-in business toolset
Group Office is the only one of the three that bundles CRM, invoicing, time tracking, and a support helpdesk alongside core groupware, making it closer to a small-business back office than a pure collaboration tool.
Group Office
Battle-tested at real scale
SOGo is used in production environments with thousands of mailboxes and native CalDAV, CardDAV, and Microsoft ActiveSync support, making it a common choice for hosting providers and ISPs rather than just small teams.
SOGo
Very different project maturity
Group Office traces back to 2003 and SOGo to 2004, giving both over two decades of production hardening, while Colanode was created in 2024 and is still a young, actively evolving project without a finalized cloud pricing plan.
Group Office, SOGo, Colanode
Free self-hosting across the board
All three can be self-hosted at no license cost with unlimited users on their core editions, though Group Office gates its CRM, helpdesk, and Kanban tools behind a paid Professional tier.
Colanode, Group Office, SOGo
Feature-by-Feature
Core Collaboration Features
Feature
Colanode
Group Office
SOGo
Team chat and instant messaging
Available
Limited
Unavailable
Notion-style pages and databases
Available
Unavailable
Unavailable
Email and shared calendaring
Unavailable
Available
Available
CRM, invoicing, and helpdesk
Unavailable
Available
Unavailable
Sync, Mobile, and Standards
Feature
Colanode
Group Office
SOGo
CalDAV, CardDAV, or ActiveSync support
Not documented
Available
Available
Native desktop application
Available
Not documented
Not documented
Deployment, Licensing, and Cost
Feature
Colanode
Group Office
SOGo
Self-hosted deployment
Available
Available
Available
Free tier with unlimited users
Available
Available
Available
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Colanode
Self-Hosted — Free n/a
Cloud (Beta) — Free during beta n/a
Group Office
Community — Free One-time (self-hosted)
Professional — About 439 euros license plus 219 euros per year for updates One-time license plus annual update fee
Online (Cloud) — From about $12/month Monthly
SOGo
Self-Hosted (Open Source) — Free N/A
Commercial Support (via Alinto) — Custom pricing Contract
Pros & Cons
Colanode
Pros
Fully open source (Apache 2.0) with an active GitHub community and frequent releases
Local-first design keeps the app fast and usable offline
Combines chat, docs, databases, and files in one tool instead of several separate apps
Free to self-host with no per-seat licensing cost
Cons
Young project (created 2024) without the maturity or ecosystem of established tools like Notion or Slack
Cloud hosting is still in beta with no finalized pricing, so long-term cost is uncertain
Self-hosting requires managing PostgreSQL, Redis/Valkey, and storage infrastructure
Smaller integration and plugin ecosystem compared to mature commercial alternatives
Group Office
Pros
The Community edition is free, open source, and supports unlimited users, making it inexpensive to deploy at scale.
Self-hosting gives organizations full control over data location, which matters for public-sector and privacy-conscious deployments.
Bundles groupware, CRM, invoicing, and helpdesk functionality in a single suite rather than requiring separate tools.
Has been in continuous development since 2003, giving it a long production track record versus newer self-hosted alternatives.
Offers both self-hosted and managed cloud deployment options, so organizations can choose based on their operational capacity.
Cons
The user interface is dated compared to modern SaaS collaboration tools like Google Workspace or Microsoft 365.
Self-hosting requires PHP and database administration skills, which smaller organizations may not have in-house.
Advanced business features are locked behind the paid Professional tier and add-ons rather than included in the free edition.
Support for the free Community edition relies on community forums rather than guaranteed response times.
Smaller ecosystem of third-party integrations and plugins compared to larger groupware and productivity platforms.
SOGo
Pros
Free and open source with no per-user licensing cost for the core server
Broad native client support through CalDAV, CardDAV, and ActiveSync
Integrates with existing LDAP, Active Directory, and IMAP infrastructure
Proven at scale in production environments with thousands of mailboxes
Active commercial steward (Alinto) available for organizations that want paid support
Cons
Requires in-house IT expertise or a paid support contract to install, secure, and maintain
Web interface looks dated compared to modern SaaS email clients
No official cloud-hosted SaaS version directly from the core project, only third-party hosting
Documentation can be technical and geared toward system administrators rather than end users
Use Cases
Choose Colanode: Technical teams that want a modern, local-first Notion-and-Slack-style workspace they fully own and control
Choose Group Office: Small businesses, schools, and public-sector organizations that need email, CRM, invoicing, and helpdesk bundled into one self-hosted suite
Choose SOGo: IT teams and hosting providers that need a lean, standards-based webmail and calendar server proven at scale with thousands of mailboxes
Colanode
Privacy-conscious team collaboration — A team that wants full control over its data self-hosts Colanode to get Slack-and-Notion-style functionality without relying on third-party SaaS storage.
Offline-capable team workspace — A distributed or field team relies on Colanode's local-first sync to keep working on chat, pages, and files even without a stable internet connection.
Group Office
Self-hosted email and collaboration for public-sector organizations — Government agencies and schools deploy Group Office on their own infrastructure to keep email, calendars, and files under direct organizational control.
Small business CRM and invoicing — Small businesses use the Professional edition to manage contacts, projects, time tracking, and invoicing in one suite instead of stitching together separate tools.
Low-cost productivity suite alternative — Cost-conscious organizations replace hosted productivity suites with Group Office's free, self-hosted Community edition for email, calendar, and file sharing.
SOGo
Self-Hosted Business Email — Small and mid-size businesses replace hosted email suites with a self-hosted SOGo server for full control over data and infrastructure.
ISP and Hosting Provider Webmail — Hosting providers deploy SOGo to offer webmail, calendar, and contact services to thousands of customer mailboxes across multiple domains.
Exchange Alternative for Regulated Industries — Organizations with data residency or compliance requirements use SOGo to keep email and calendar data on infrastructure they control.
Frequently Asked Questions
Is Colanode a good self-hosted replacement for Slack and Notion together?
It's built as exactly that: a combined chat, pages, and database workspace, self-hostable via Docker-style infrastructure with PostgreSQL, Redis, and object storage. Just note it is a young project (created 2024) without the maturity or plugin ecosystem of established tools.
Does Group Office include a CRM out of the box?
CRM and deal tracking come with the paid Professional edition, priced around 439 euros as a one-time license plus roughly 219 euros per year for updates. The free Community edition covers email, calendar, files, and document editing but not CRM.
Can SOGo sync calendars and contacts to iPhone and Android?
Yes. SOGo supports CalDAV and CardDAV for cross-platform sync plus Microsoft ActiveSync, which mobile devices, Outlook, and Apple Calendar and Contacts can connect to natively.
Which of these three has the longest production track record?
Group Office (initial release in 2003) and SOGo (2004, with roots back to 1996) have both been in continuous development for over two decades. Colanode is far newer, created in 2024, and is still finalizing its cloud monetization plan.
Do any of these charge a per-seat license fee to self-host?
No. All three can be self-hosted with unlimited users at no license cost on their core/Community editions. Group Office's paid Professional tier and add-ons, and SOGo's optional commercial support via Alinto, are the only paid layers on top.