Softwr

Email Marketing · head to head

Mailjet vs Sailthru

Mailjet logo

Mailjet

Email Marketing

Email API, SMTP relay and campaign platform

From
Free
Rated
-
Full reviewWebsite
Sailthru logo

Sailthru

Email Marketing

Retail and publisher email personalisation, now one product inside the Marigold portfolio

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Mailjet has a free tier, so it costs nothing to try first.
  • Each has a real cost: Mailjet free plan caps at 6,000 emails per month with a hard 200 emails per day limit; Sailthru the product sits in a portfolio with several overlapping platforms under one owner, so roadmap investment is a portfolio decision rather than a product decision and is worth asking about in writing.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Mailjet and Sailthru actually diverge.

Attributes where Mailjet and Sailthru differ
AttributeMailjetSailthru
Starting priceFreeOn request
Pricing modelsubscriptionquote
Free tierYesNo
PlatformsWebWeb, REST API

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

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 Mailjet

Nothing recorded that Sailthru does not also cover.

Only in Sailthru

  • Interest profiles
  • Personalisation engine
  • Prediction Manager
  • Site personalisation
  • Zephyr templating
  • Lifecycle optimiser

What people use each for

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

Mailjet

  • Email marketing campaigns for small to medium-sized businessesnot Sailthru
  • Transactional email delivery with API and SMTP relaynot Sailthru

Sailthru

  • A publisher sending a personalised daily newsletter assembled per reader from a content cataloguenot Mailjet
  • A retailer that wants email and on-site recommendations driven by the same affinity modelnot Mailjet
  • High-cadence sending where per-recipient content assembly matters more than journey branchingnot Mailjet
  • Teams that want churn and lifetime value scores available as native campaign conditions rather than imported fieldsnot Mailjet

Where each one falls short

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

Mailjet

  • Free plan caps at 6,000 emails per month with a hard 200 emails per day limit
  • Starter plan is capped at 2,000 contacts; unlimited contacts require the Essential tier
  • Email credits do not roll over and unused emails expire at the end of each billing cycle
  • Essential and Premium plans both cap at 15,000 emails per month for $17 and $27 respectively, so the price increase buys other features, not more volume

Sailthru

  • The product sits in a portfolio with several overlapping platforms under one owner, so roadmap investment is a portfolio decision rather than a product decision and is worth asking about in writing.
  • Pricing counts stored profiles, so retained inactive readers keep costing money long after they stopped opening anything.
  • On-site personalisation requires a developer to implement the JavaScript and maintain the content feed, which puts the highest-value feature behind engineering time.
  • Zephyr is a proprietary templating language, so template maintenance skills are scarce compared with the Liquid syntax used by most competitors.
  • It is built for high-cadence content and retail sending, and B2B lifecycle programmes with long sales cycles sit poorly on the model.

Pricing, plan by plan

Mailjet

Free
  • FreeFree
    • 6,000 emails per month
    • 200 emails per day limit
    • 1,000 contacts
  • Starter$9/monthly
    • 8,000 emails per month
    • 2,000 contacts
    • Brand Kit
  • Essential$17/monthly
    • 15,000 emails per month
    • Unlimited contacts
    • Segmentation
  • Premium$27/monthly
    • 15,000 emails per month
    • Advanced statistics
    • Automations

Sailthru

On request
  • Sailthru$undefined/year
    • Priced on stored profiles and send volume
    • Site personalisation and prediction features licensed by module
    • Annual contract through Marigold

Which should you pick?

Choose Mailjet if

  • You want to start without paying.
Mailjet review

Choose Sailthru if

  • You need interest profiles.
  • You work on Web, REST API.
  • You also want personalisation engine.
Sailthru review

Questions people ask

Is Mailjet or Sailthru better?
Neither clearly leads. Mailjet starts at Free and Sailthru at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Mailjet or Sailthru?
Mailjet has a free tier; the other does not. Paid plans start at Free for Mailjet and On request for Sailthru.
Does Mailjet or Sailthru run on more platforms?
Mailjet runs on Web. Sailthru runs on Web, REST API.
Can I use Mailjet for free?
Yes. Mailjet has a free tier, so you can try it without paying. Sailthru starts at On request.
What is Mailjet best used for?
Mailjet is most often used for email marketing campaigns for small to medium-sized businesses, transactional email delivery with api and smtp relay. Of those, email marketing campaigns for small to medium-sized businesses and transactional email delivery with api and smtp relay are not what Sailthru is typically brought in for.
What can Mailjet do that Sailthru cannot?
Sailthru covers Interest profiles, Personalisation engine, Prediction Manager, Site personalisation.

Answered from the vendors’ own pages

Mailjet: Does Mailjet offer annual billing discounts?

Yes, Mailjet offers annual billing with a 10% discount compared to monthly billing. Both monthly and annual payment cycles are available for all paid plans.

Source
Sailthru: Who owns Sailthru now?

Marigold, formerly CM Group, which also owns Campaign Monitor, Emma, Selligent, Liveclicker and Cheetah Digital.

Mailjet: What payment currencies are supported?

Mailjet accepts payments in USD, EUR, and GBP. Currency selection is available during account setup and can be changed in account settings.

Source
Sailthru: Does that affect the roadmap?

It can. Overlapping products in one portfolio compete for investment, so ask which platform is the strategic one for your segment before signing multi-year.

Mailjet: What features are limited on the Free plan?

The Free plan includes 6,000 emails per month with a 200 email per day limit, 1,000 contacts, basic statistics, form builder, and APIs. Advanced statistics, automations, landing pages, and team management require paid plans.

Source
Sailthru: Is it worth it just for newsletters?

For personalised daily newsletters at publisher scale it remains one of the strongest options. For simple broadcast sending it is heavily over-specified.

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