cirrux

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Cirrux next to Google Workspace and Microsoft 365

Cirrux is meant to replace both of them, and we are not there yet. Some things you rely on today are missing, and we would rather you find that out here than a week after you switched.

Every Cirrux row describes what you get today. Anything we are still testing counts as no. Where we are ahead, we say so too.

  • Available today
  • Partly, see the note
  • Not available
  • Does not apply

Checked in October 2026. Google Workspace and Microsoft 365 are compared on their Business Standard plans; where something needs a more expensive plan, the note says so.

Mail

Mail is where Cirrux started and where it is most complete. The gaps are mostly conveniences: scheduled send, templates, and native mobile apps.

Cirrux
Google
Microsoft
Your own domain
Yes.One-click DNS setup for most registrars
Yes.
Yes.
Aliases
Yes.Unlimited on your own domains
Yes.Up to 30 per user
Yes.Up to 400 per user
Catch-all address
Yes.New addresses become real aliases you can send from
Yes.
Partly.Only with a mail flow rule workaround
Shared mailboxes
Yes.Shared read state, send as the shared address
Partly.Collaborative inboxes through Groups
Yes.
Unified inbox across accounts
Yes.In the web app
Partly.Mobile app only
Partly.Mobile app only
Conversation and single-email view
Yes.
Yes.
Yes.
Nested labels and folders
Yes.Labels show up as folders in IMAP apps
Yes.
Yes.
Server-side filters
Yes.Also on contact groups and newsletters, and on mail you already have
Yes.
Yes.
Search operators
Yes.Gmail-style, with OR and brackets
Yes.
Yes.
Snooze
Yes.Understands typed dates like "next friday 9am"
Yes.
Yes.
Remind me if nobody replies
Yes.
Partly.Automatic nudges you cannot set yourself
Partly.Follow-up flags
Undo send
Yes.20 seconds
Yes.Up to 30 seconds
Yes.Up to 10 seconds
Scheduled send
No.
Yes.
Yes.
Templates
No.
Yes.
Yes.
Auto-reply
Yes.With start and end dates
Yes.
Yes.
Signatures with images
Yes.Admins can manage them for everyone
Yes.
Yes.
Large files as a link
No.Attachments up to 25 MB
Yes.Through Drive
Yes.Through OneDrive
Tracking pixels blocked
Yes.Pixels stripped, images and fonts load through our servers
Partly.Images are proxied, opens can still be seen
Partly.Remote images can be blocked
Spam and virus filtering
Yes.With your own allow and block lists
Yes.
Yes.
Any IMAP and SMTP app
Yes.With push, and app passwords per mailbox
Yes.
Partly.Modern sign-in only, many apps cannot connect
POP3
No.
Yes.
Yes.
Native mobile apps
No.Mobile web app, or any mail app on your phone
Yes.
Yes.
Works offline
Partly.Changes made offline sync when you reconnect
Yes.
Yes.
S/MIME or PGP
No.Use them in your own mail app
Partly.S/MIME on Enterprise plans
Yes.S/MIME
Backup MX in a second country
Yes.Accepts your mail if our main servers are down
No.
No.
MTA-STS
Partly.On our own domains, yours on request
Yes.
Yes.
DANE
No.
No.
Yes.
Export everything
Partly.Over IMAP, or a single email as .eml
Yes.Takeout
Yes.PST export
Retention and eDiscovery
No.
Yes.Vault, Business Plus and up
Yes.Purview
Built-in AI assistant
No.Bring your own, see Developers and AI
Yes.Gemini
Yes.Copilot

Calendar

The calendar is fast and speaks CalDAV, so it shows the same thing on the web, your iPhone and Thunderbird. What it does not do yet is the scheduling work around meetings: finding a free slot, booking rooms, booking pages and video calls.

Cirrux
Google
Microsoft
Web calendar
Yes.Day, week, month and list, with keyboard shortcuts
Yes.
Yes.
CalDAV for any calendar app
Yes.
Yes.
No.
Multiple calendars
Yes.
Yes.
Yes.
Recurring events with exceptions
Yes.
Yes.
Yes.
Invitations and replies by email
Yes.Reply from the calendar, not from inside the email yet
Yes.
Yes.
Share with colleagues
Yes.Viewer or editor
Yes.
Yes.
Share outside your organization
Partly.Other Cirrux users, or a read-only link
Yes.
Yes.
Subscribe to other calendars
Yes.Any iCal feed
Yes.
Yes.
Look up a colleague and add their calendar
Yes.
Yes.
Yes.
Find a time when everyone is free
No.
Yes.
Yes.
Rooms and resources
No.
Yes.
Yes.
Booking pages
No.
Yes.Appointment schedules
Yes.Bookings
Video calls
No.Paste any meeting link. Cirrux Meet is on the roadmap
Yes.Meet
Yes.Teams
Time zone per event
Partly.Shown correctly, set it from a calendar app, not the web
Yes.
Yes.
Event reminders
Partly.Your calendar app shows them, the web app cannot set them yet
Yes.
Yes.
Tasks
Partly.Apple Reminders and other CalDAV apps, no web app
Yes.Tasks
Yes.To Do
Working hours and out of office
No.
Yes.
Yes.
Native mobile apps
Partly.Mobile web app, or your phone’s own calendar
Yes.
Yes.

Contacts

Contacts sync to every phone and desktop over CardDAV, and they fill in addresses as you type in Mail and Calendar. Our own contacts app is early: it lists and searches, but you edit contacts in the app on your phone or computer.

Cirrux
Google
Microsoft
CardDAV for any contacts app
Yes.
Yes.
No.
Contacts web app
Partly.Early access, list and search only
Yes.
Yes.
Edit contacts on the web
No.Edit in your contacts app, it syncs back
Yes.
Yes.
Contact photos
Yes.
Yes.
Yes.
Groups
Partly.Over CardDAV, and usable in mail filters
Yes.Labels
Yes.
Suggestions while you type an address
Yes.Contacts, people you emailed and colleagues
Yes.
Yes.
Company directory
Partly.Colleagues are suggested in Mail and Calendar
Yes.
Yes.
Shared address books
No.
Partly.Through the directory only
Partly.Shared contact folders

Drive

Drive stores and shares files well, with every file encrypted under its own key. It is a file manager, not an office suite: there are no previews, no version history and no apps yet.

Cirrux
Google
Microsoft
Storage per user
Yes.20 GB, or 100 GB with Plus, pooled across the workspace
Yes.2 TB, pooled, on Business Standard
Yes.1 TB
Upload files and folders
Yes.Up to 2 GB per file
Yes.
Yes.
Share with colleagues
Yes.Viewer or editor, per person or the whole workspace
Yes.
Yes.
Share with anyone by email
Yes.They accept it before it shows up in their Drive
Yes.
Yes.
Ask for access
Yes.
Yes.
Yes.
Public links
Partly.View and download, no expiry or password yet
Partly.No expiry or password on public links
Yes.With expiry and password
Trash
Yes.30 days
Yes.30 days
Yes.93 days
Search
Partly.File names only, with operators like type: and larger:
Yes.Inside files too
Yes.Inside files too
File previews
No.Files download when you open them
Yes.
Yes.
Version history
No.
Yes.
Yes.
Shared drives for teams
No.
Yes.
Yes.SharePoint
Desktop sync app
No.
Yes.
Yes.
Native mobile apps
No.Mobile web app
Yes.
Yes.
Edit Word, Excel and PowerPoint files
No.
Yes.
Yes.

Docs

Early access

Cirrux Docs is in early access: supporters can use it today while we get it ready for everyone. It is a writing tool for documents that live on screen, not a Word clone. Spreadsheets, slides and forms do not exist yet.

Cirrux
Google
Microsoft
Write together in real time
Yes.With live cursors
Yes.
Yes.
Comments
Yes.Threads, reactions, and assign to a person
Yes.
Yes.
Suggestions
Yes.For text and formatting
Yes.
Yes.Track changes
Headings, lists and checklists
Yes.
Yes.
Yes.
Images and attachments
Yes.Up to 100 MB per file
Yes.
Yes.
Tables
No.Next on the list
Yes.
Yes.
@mentions
No.
Yes.
Yes.
Documents live in Drive folders
Yes.And share like the folder they are in
Yes.
Yes.
Public read-only link
Yes.
Yes.
Yes.
Version history
No.
Yes.
Yes.
Export
Partly.PDF and Markdown, no Word file yet
Yes.
Yes.
Import Word files
No.Paste the text in
Yes.
Yes.
Templates
No.
Yes.
Yes.
Works offline
No.Rides out short drops in your connection
Yes.
Yes.
Your own AI agent as a co-author
Yes.Agents edit, comment and suggest through the API, credited by name
Partly.Gemini, inside the editor
Partly.Copilot, inside the editor
Spreadsheets
No.
Yes.Sheets
Yes.Excel
Presentations
No.
Yes.Slides
Yes.PowerPoint
Forms
No.
Yes.Forms
Yes.Forms

Import and sync

Switching is the hard part, so we made it gradual. Connect your Google account and Cirrux keeps pulling in new mail, events and contacts while you get used to it. Sync with Microsoft 365 is in testing; until then the IMAP, calendar and contacts imports do a one-time move.

Cirrux
Google
Microsoft
Keep syncing your old account while you switch
Yes.From Google: mail, calendar and contacts
Partly.One-time migration
Partly.One-time migration
Import from Gmail or Google Workspace
Yes.Mail, calendar and contacts
Does not apply.
Yes.One-time migration
Import from Microsoft 365
No.In testing. Use the IMAP, calendar and contacts imports today
Yes.One-time migration
Does not apply.
Move a whole organization at once
No.From Google Workspace, in private beta
Yes.
Yes.
Import mail from any IMAP server
Yes.Run it again later and only new mail comes over
Yes.
Yes.
Import calendar files (.ics)
Yes.
Yes.
Yes.
Import contacts files (.vcf)
Yes.
Yes.
Yes.
Import files from Google Drive or OneDrive
No.Upload them, folders included
Yes.From OneDrive and others
Yes.From Google Drive and others
Back up your Gmail while you decide
Yes.Cirrux Backup, encrypted with a key only you hold
Partly.Takeout, by hand
No.

Identity and access

For your own account, Cirrux is ahead: passkey-only sign-in, apps whose access you can narrow after the fact, and your data in Europe under keys that belong to your workspace. What we are still building are the controls a large IT department expects, like SAML, enforced two-factor, audit logs and custom roles.

Cirrux
Google
Microsoft
Passkeys
Yes.
Yes.
Yes.
Turn password sign-in off entirely
Yes.Passkey-only accounts
Partly.Passkeys first, the password stays
Yes.Passwordless accounts
Hardware security keys
Yes.YubiKey and other FIDO2 keys
Yes.
Yes.
Authenticator app codes
Yes.With recovery codes
Yes.
Yes.
See and sign out your sessions
Yes.One by one
Yes.
Partly.Sign out everywhere at once
Change what a connected app may do
Yes.Narrow its access later without reconnecting
Partly.Revoke only
Partly.Revoke only
App passwords per mailbox
Yes.Revocable, and admins can manage them
Partly.Per account
Partly.Legacy only
Encryption keys per workspace
Yes.Mail and files under AES-256 keys that belong to your workspace
Partly.Customer-managed keys on Enterprise plans
Partly.Customer Key on E5
Data stays in Europe
Yes.Frankfurt, with backup mail in Vienna. European company
Partly.Data regions on paid plans, American company
Partly.EU Data Boundary, American company
Single sign-on with your identity provider
Partly.OIDC with Okta, Entra ID or Google. We set it up with you
Yes.
Yes.
SAML
No.
Yes.
Yes.
SCIM user provisioning
Partly.Users, not groups. We set it up with you
Partly.Through Google’s own sync tools
Yes.
Require two-factor for everyone
No.
Yes.
Yes.
Alerts for new sign-ins
No.Alerts for security changes and new apps
Yes.
Partly.Risky sign-ins on higher plans
Admin roles
Partly.Admin and member
Yes.Custom roles
Yes.Custom roles
Audit log for admins
No.Email delivery logs, no audit log yet
Yes.
Yes.

Developers and AI

Cirrux is built to be scripted. A public API, signed webhooks, a command line tool and an MCP server let a script or your own AI assistant work in your account, with exactly the access you give it.

Cirrux
Google
Microsoft
Public REST API
Yes.Mail, calendar, contacts, Drive and Docs, with an OpenAPI spec
Yes.
Yes.Microsoft Graph
Sign in as the user with OAuth
Yes.OAuth 2.1 with PKCE always on, scopes the user can narrow later
Yes.
Yes.
API keys for scripts and servers
No.In early access, OAuth works today
Yes.Service accounts
Yes.App registrations
Webhooks for incoming mail
Yes.Signed, with retries
Partly.Push through Google Cloud Pub/Sub
Yes.Change notifications
Webhooks for calendar and files
No.Mail only for now
Yes.
Yes.
Official command line tool
Yes.Mail, calendar, contacts, Drive and Docs, with a skill for AI agents
Partly.Admin tools, data through unofficial tools
Partly.PowerShell, mostly for admins
MCP server for AI assistants
Yes.Mail, calendar and Drive search. Works with ChatGPT, Claude, Mistral and others
Partly.Through connectors each AI vendor builds
Partly.Copilot first, others through Graph
Choose what an assistant may do
Yes.Switch Mail or Calendar off, or allow reading without sending
Partly.Per-scope consent, revoke only afterwards
Partly.Per-scope consent, revoke only afterwards
See what an assistant did
Yes.Every change shows up in your activity feed
Partly.Admin audit logs
Partly.Admin audit logs

Chat and meetings

Both are on the roadmap. Neither exists today.

Cirrux
Google
Microsoft
Team chat
No.
Yes.Chat
Yes.Teams
Video meetings
No.Cirrux Meet is next after Docs
Yes.Meet
Yes.Teams

Spotted something wrong?

All three products change every month, ours fastest of all. If a row is out of date, or unfair to Google or Microsoft, email help@cirrux.info and we will fix it.

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