Is BoldSign or Fastmail better?

Neither clearly leads. BoldSign starts at Free and Fastmail at $3/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, BoldSign or Fastmail?

BoldSign has a free tier; the other does not. Paid plans start at Free for BoldSign and $3/month for Fastmail.

Does BoldSign or Fastmail run on more platforms?

BoldSign runs on Web. Fastmail runs on Web, iOS, Android, macOS, Windows.

Can I use BoldSign for free?

Yes. BoldSign has a free tier, so you can try it without paying. Fastmail starts at $3/month.

What is BoldSign best used for?

BoldSign is most often used for esignature automation, contract signing. Of those, esignature automation and contract signing are not what Fastmail is typically brought in for.

What can BoldSign do that Fastmail cannot?

Fastmail covers Custom domain hosting, Masked email, Unlimited aliases, Integrated calendar and contacts.

Productivity · head to head

BoldSign vs Fastmail

BoldSign

Productivity

eSignature API and app for developers and teams

From: Free
Rated: -

Full review Website

Fastmail

Productivity

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

From: $3/month
Rated: -

Full review Website

The short version

Only BoldSign has a free tier, so it costs nothing to try first.
Each has a real cost: BoldSign premium plan: additional envelopes cost $0.50 each after 250/month limit; 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.
Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which BoldSign and Fastmail actually diverge.

Attributes where BoldSign and Fastmail differ
Attribute	BoldSign	Fastmail
Starting price	Free	$3/month
Pricing model	subscription	Per user per month
Free tier	Yes	No
Platforms	Web	Web, iOS, Android, macOS, Windows

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 BoldSign

Nothing recorded that Fastmail does not also cover.

Only in Fastmail

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

What people use each for

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

BoldSign

eSignature automationnot Fastmail
Contract signingnot Fastmail

Fastmail

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

Where each one falls short

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

BoldSign

Premium plan: additional envelopes cost $0.50 each after 250/month limit
Monthly billing costs 60-85% more than yearly billing (no 40% discount)
Enterprise API requires minimum $30/month

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.

Pricing, plan by plan

BoldSign

Free

EssentialFree
- 25 envelopes/month
- 2 templates
- No additional users
Growth$5/month yearly
- 50 envelopes/month
- 10 templates
Business$15/month yearly
- Unlimited envelopes
- Unlimited templates
- SSO
Premium$99/month yearly
- 250 envelopes/month
- Unlimited users

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

Which should you pick?

Choose BoldSign if

You want to start without paying.

BoldSign review

Choose Fastmail if

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

Fastmail review

Questions people ask

Is BoldSign or Fastmail better?: Neither clearly leads. BoldSign starts at Free and Fastmail at $3/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, BoldSign or Fastmail?: BoldSign has a free tier; the other does not. Paid plans start at Free for BoldSign and $3/month for Fastmail.
Does BoldSign or Fastmail run on more platforms?: BoldSign runs on Web. Fastmail runs on Web, iOS, Android, macOS, Windows.
Can I use BoldSign for free?: Yes. BoldSign has a free tier, so you can try it without paying. Fastmail starts at $3/month.
What is BoldSign best used for?: BoldSign is most often used for esignature automation, contract signing. Of those, esignature automation and contract signing are not what Fastmail is typically brought in for.
What can BoldSign do that Fastmail cannot?: Fastmail covers Custom domain hosting, Masked email, Unlimited aliases, Integrated calendar and contacts.

Answered from the vendors’ own pages

BoldSign: Does BoldSign offer a free plan?

BoldSign's Essential plan is free and includes 25 envelopes per month, 2 templates, and basic features like audit trails and authentication.

Source

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.

BoldSign: How much does the BoldSign Growth plan cost?

The Growth plan costs $5 per month per user with annual billing or $15 per month per user with monthly billing, including 50 envelopes/month per user.

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.

BoldSign: What are the overage fees for BoldSign's Premium plan?

The Premium plan includes 250 envelopes per month for $99-$138/month, with additional envelopes charged at $0.75 per envelope.

Source

Fastmail: Can I use my own domain?

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

BoldSign: How much does BoldSign charge for API access?

BoldSign's Enterprise API costs $0.75 per envelope with a minimum charge of $30/month and includes 40 envelopes and 2 application users.

Source

BoldSign vs Fastmail

BoldSign

Fastmail

The short version

Where they differ

What each one covers

Only in BoldSign

Only in Fastmail

What people use each for

BoldSign

Fastmail

Where each one falls short

BoldSign

Fastmail

Pricing, plan by plan

BoldSign

Fastmail

Which should you pick?

Choose BoldSign if

Choose Fastmail if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on BoldSign

More on Fastmail

Keep looking

Other head to heads