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Productivity · head to head

Fastmail vs LibreOffice

Fastmail logo

Fastmail

Productivity

Paid email hosting with custom domains, calendar and contacts, run without ad-based revenue

From
$3/month
Rated
-
Full reviewWebsite
LibreOffice logo

LibreOffice

Productivity

Free and open-source office suite that runs entirely offline

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only LibreOffice has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fastmail it does not provide end-to-end encryption by default, so users specifically wanting zero-knowledge mail should compare it against Proton Mail or Tuta rather than assume parity.; LibreOffice real-time collaborative editing is far behind Microsoft 365 and Google Workspace, and for teams who co-edit this alone usually decides the question
  • They diverge on capability: Fastmail covers Custom domain hosting, LibreOffice covers Full suite.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Fastmail and LibreOffice actually diverge.

Attributes where Fastmail and LibreOffice differ
AttributeFastmailLibreOffice
Starting price$3/monthFree
Pricing modelPer user per monthOpen source, no licence fee
Free tierNoYes
PlatformsWeb, iOS, Android, macOS, WindowsWindows, macOS, Linux

Identical on both: user rating (Not yet rated), category (Productivity).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Fastmail

  • Custom domain hosting
  • Masked email
  • Unlimited aliases
  • Integrated calendar and contacts
  • Migration tools
  • JMAP support

Only in LibreOffice

  • Full suite
  • Works offline
  • OpenDocument native
  • Microsoft format support
  • No telemetry or AI
  • Extensions and macros

What people use each for

The jobs each tool is most often brought in to do.

Fastmail

  • Someone who wants their email address tied to a domain they own rather than a free provider they do notnot LibreOffice
  • A small business wanting hosted mail on its own domain without running mail server infrastructurenot LibreOffice
  • A person leaving Gmail specifically to stop an ad-funded provider processing their mailnot LibreOffice
  • A household migrating several accounts to one paid provider with shared billingnot LibreOffice

LibreOffice

  • Organisations where documents cannot leave the premises for policy or statutory reasonsnot Fastmail
  • Replacing per-seat office licences at scalenot Fastmail
  • Long-term archives needing a format not defined by a single vendornot Fastmail
  • Reviving older hardware that current commercial suites strainnot Fastmail

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Fastmail

  • It does not provide end-to-end encryption by default, so users specifically wanting zero-knowledge mail should compare it against Proton Mail or Tuta rather than assume parity.
  • Moving to Fastmail is a real migration with DNS changes for a custom domain, unlike installing a client such as Spark or Bluemail over an existing account.
  • There is no free tier at all, so a user just wanting to try it commits to a paid trial rather than a permanently free option.
  • Storage limits on the entry Basic plan are modest next to the free allowance Gmail gives, and heavy attachment users will need Standard or above.
  • Being based in Australia means it falls under Australian data access law, which some privacy-focused buyers weigh differently from Swiss or German jurisdictions used by Proton Mail and Tuta.

LibreOffice

  • Real-time collaborative editing is far behind Microsoft 365 and Google Workspace, and for teams who co-edit this alone usually decides the question
  • Mobile support is weak, which is disqualifying for a workforce that reviews documents on phones
  • Complex Microsoft Office documents still lose formatting in transit, so exchange-heavy workflows need testing with real files
  • Central policy management, conditional access and audit tooling are thin against the commercial suites
  • Advanced spreadsheet work is where the gap with Excel is widest, and it affects exactly the users least willing to change

Pricing, plan by plan

Fastmail

$3/month
  • Basic$3/month
    • 6GB storage
    • No custom domain support
    • Core mail, calendar and contacts
  • Standard$5/month
    • 60GB storage
    • Custom domain support
    • Masked email and aliases
  • Professional$9/month
    • 150GB storage
    • Multiple custom domains
    • Priority support

LibreOffice

Free
  • LibreOfficeFree
    • Full suite
    • Commercial use permitted
    • No per-seat licence

Which should you pick?

Choose Fastmail if

  • You need custom domain hosting.
  • You work on Web, iOS, Android, macOS, Windows.
  • You also want masked email.
Fastmail review

Choose LibreOffice if

  • You need full suite.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want works offline.
LibreOffice review

Questions people ask

Is Fastmail or LibreOffice better?
Neither clearly leads. Fastmail starts at $3/month and LibreOffice at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fastmail or LibreOffice?
LibreOffice has a free tier; the other does not. Paid plans start at $3/month for Fastmail and Free for LibreOffice.
Does Fastmail or LibreOffice run on more platforms?
Fastmail runs on Web, iOS, Android, macOS, Windows. LibreOffice runs on Windows, macOS, Linux.
Can I use LibreOffice for free?
Yes. LibreOffice has a free tier, so you can try it without paying. Fastmail starts at $3/month.
What is Fastmail best used for?
Fastmail is most often used for someone who wants their email address tied to a domain they own rather than a free provider they do not, a small business wanting hosted mail on its own domain without running mail server infrastructure, a person leaving gmail specifically to stop an ad-funded provider processing their mail, a household migrating several accounts to one paid provider with shared billing. Of those, someone who wants their email address tied to a domain they own rather than a free provider they do not and a small business wanting hosted mail on its own domain without running mail server infrastructure are not what LibreOffice is typically brought in for.
What can Fastmail do that LibreOffice cannot?
Fastmail covers Custom domain hosting, Masked email, Unlimited aliases, Integrated calendar and contacts. LibreOffice covers Full suite, Works offline, OpenDocument native, Microsoft format support.

Answered from the vendors’ own pages

Fastmail: Is Fastmail a client like Spark, or does it host my email?

It hosts the mailbox itself; there is no separate provider underneath it the way Spark sits over Gmail.

LibreOffice: Is LibreOffice really free for business use?

Yes. It is open source with no per-seat licence and no restriction on commercial use. The Document Foundation is funded by donations and sponsors.

Fastmail: Does Fastmail offer end-to-end encryption?

Not by default in the way Proton Mail or Tuta do; its privacy position rests on being subscription-funded rather than ad-funded.

LibreOffice: Does it have AI features?

No. The 26.8 release states it contains no generative AI, that documents are not transmitted to remote services, and that no component requires network access.

Fastmail: Can I use my own domain?

Yes, from the Standard plan up, with full alias and masked email support.

LibreOffice: Can it open Microsoft Office files?

Yes, and save back to them. Round-tripping complex documents is imperfect between any two suites, so test with your own files before committing to an exchange-heavy workflow.

LibreOffice: Why do governments use it?

Two reasons: no per-seat cost at scale, and OpenDocument is an ISO standard implemented by more than one vendor, which matters for archives that must stay readable after a vendor relationship ends.

LibreOffice: What is the biggest reason not to use it?

Collaborative editing. If several people work on the same document simultaneously, Microsoft 365 and Google Workspace are substantially better and that gap is not closing.

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