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Productivity · head to head

Fastmail vs Signal

Fastmail logo

Fastmail

Productivity

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

From
$3/month
Rated
-
Full reviewWebsite
Signal logo

Signal

Communication

Speak Freely

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Signal 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.; Signal signal must be installed on a phone before the desktop app can be used, so there is no phone-free desktop-only account
  • They diverge on capability: Fastmail covers Custom domain hosting, Signal covers End-to-end encryption.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Fastmail and Signal actually diverge.

Attributes where Fastmail and Signal differ
AttributeFastmailSignal
Starting price$3/monthFree
Pricing modelPer user per monthfree
Free tierNoYes
PlatformsWeb, iOS, Android, macOS, WindowsWindows, Macos, Linux, Ios, Android
CategoryProductivityCommunication
FoundedUnknown2010

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

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 Signal

  • End-to-end encryption
  • Disappearing messages
  • Screen security
  • Group chats
  • Voice calls
  • Video calls
  • File sharing
  • No data collection

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 Signal
  • A small business wanting hosted mail on its own domain without running mail server infrastructurenot Signal
  • A person leaving Gmail specifically to stop an ad-funded provider processing their mailnot Signal
  • A household migrating several accounts to one paid provider with shared billingnot Signal

Signal

  • Private messagingnot Fastmail
  • Secure group communicationnot Fastmail
  • Confidential conversationsnot Fastmail
  • Journalism communicationnot Fastmail
  • Family messagingnot 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.

Signal

  • Signal must be installed on a phone before the desktop app can be used, so there is no phone-free desktop-only account

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

Signal

Free
  • FreeFree
    • End-to-end encrypted messaging
    • Voice and video calls
    • Group chats

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 Signal if

  • You need end-to-end encryption.
  • You want to start without paying.
  • You work on Windows, Macos, Linux, Ios, Android.
  • You also want disappearing messages.
Signal review

Questions people ask

Is Fastmail or Signal better?
Neither clearly leads. Fastmail starts at $3/month and Signal at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fastmail or Signal?
Signal has a free tier; the other does not. Paid plans start at $3/month for Fastmail and Free for Signal.
Does Fastmail or Signal run on more platforms?
Fastmail runs on Web, iOS, Android, macOS, Windows. Signal runs on Windows, Macos, Linux, Ios, Android.
Can I use Signal for free?
Yes. Signal 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 Signal is typically brought in for.
What can Fastmail do that Signal cannot?
Fastmail covers Custom domain hosting, Masked email, Unlimited aliases, Integrated calendar and contacts. Signal covers End-to-end encryption, Disappearing messages, Screen security, Group chats.

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.

Signal: How much does Signal cost?

Signal is free for everyone. The messaging app is supported by grants and donations, not user fees, and is maintained by an independent nonprofit that is not tied to any major tech companies.

Source
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.

Signal: Does Signal have ads?

No. Signal is ad-free and does not collect advertising revenue.

Source
Fastmail: Can I use my own domain?

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

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