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Mailjet vs Sender

An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.

The short answer

Both sides assessed

Mailjet compared with Sender

Both are cheap EU-based platforms doing marketing and transactional email in one account, but they meter opposite ways. Mailjet prices on emails sent with unlimited contacts, Sender on subscribers with a send multiplier. Mailjet wins for a large list mailed rarely; Sender wins for a small list mailed often, and its free tier at 2,500 subscribers is far more usable than Mailjet's 200-a-day cap. Sender has better automation, landing pages, popups, and SMS; Mailjet has the stronger transactional API, inbound parsing, sub-accounts, and the collaborative editor.

Sender compared with Mailjet

Both are cheap EU-based platforms that do marketing and transactional email in one account, but they meter differently. Mailjet prices on emails sent with unlimited contacts, which is far cheaper for a huge list mailed rarely. Sender prices on subscribers with a send multiplier, which is cheaper for a small list mailed often. Sender has better automation, landing pages, popups, and SMS; Mailjet has a much stronger transactional API with inbound parsing, sub-accounts, and proper message logs. Model your own send frequency, then pick.

Choose Mailjet if

Small businesses and European companies that need both marketing campaigns and transactional email from one vendor, especially those with a large list they mail infrequently, where per-email pricing is dramatically cheaper than per-contact pricing.

Choose Sender if

Price-sensitive small businesses, ecommerce stores, and solo operators who want a complete marketing email platform with automation and SMS for single-digit monthly spend, and anyone whose list is under 2,500 subscribers and would rather not pay at all.

Side by side

13 attributes
AttributeMailjetSender
CategoryESPsESPs
Starting price$0 for 6,000 emails a month, then $9 a month (Starter) (free plan available)$0 free for 2,500 subscribers, then from $7 a month (Standard) (free plan available)
Pricing modelMetered on monthly emails sent rather than on contacts stored, with unlimited contacts on the Essential tier and above. Four published tiers plus a quoted Custom tier, scaling with send volume.Subscriber-based subscription with a monthly send allowance set as a multiple of list size, priced on a slider rather than in a published static table. Prepaid email credits are available as an alternative for occasional senders.
Free plan6,000 emails a month capped at 200 a day, with 1,000 contacts, one sub-account, and Mailjet branding on messages.2,500 subscribers and 15,000 emails a month, including automation workflows, 10 landing pages, popups and forms, responsive templates, and transactional email access. Sender branding appears in the footer, and SMS, A/B testing, branding removal, and advanced reports are excluded.
Free trialNoThe free plan is permanent and serves as the trial; paid features can be evaluated from it
Best forSmall businesses and European companies that need both marketing campaigns and transactional email from one vendor, especially those with a large list they mail infrequently, where per-email pricing is dramatically cheaper than per-contact pricing.Price-sensitive small businesses, ecommerce stores, and solo operators who want a complete marketing email platform with automation and SMS for single-digit monthly spend, and anyone whose list is under 2,500 subscribers and would rather not pay at all.
Setup timeA few hours. Add a sending domain, publish SPF and DKIM, import contacts or drop in the API credentials, and send. Nothing is gated behind a sales conversation below the Custom tier.An hour or two. Sign up on the free plan, import or collect subscribers, authenticate a sending domain, and send. There is nothing gated behind a sales call and nothing that needs configuring before a first campaign.
Learning curveLow for the marketing side and low for developers on the transactional side. The one concept worth learning deliberately is sub-accounts, which are how you keep marketing and transactional reputation apart and are only available in quantity on Premium.Low. The product is deliberately conventional and anyone who has used another email platform will recognise every concept. The automation builder is the only part that rewards deliberate learning, and it is simpler than its competitors' by design.
PlatformsWeb application, REST API v3, SMTP relay, Inbound parsing webhook, Official libraries for 6 languagesWeb application, REST API, SMTP relay, Webhooks
ComplianceISO 27001, SOC 2, GDPR as an EU-established processor, CAN-SPAMGDPR as an EU-established processor, CAN-SPAM, CCPA
Founded20102012
HeadquartersParis, France, as part of Sinch (Stockholm, Sweden)Vilnius, Lithuania
OwnershipOwned by Sinch AB (STO: SINCH) since December 2021Privately held and bootstrapped

Strengths and limitations

Mailjet

Strengths

  • Priced on emails sent with unlimited contacts on paid plans, which is dramatically cheaper than contact-based pricing for a large list mailed infrequently and eliminates the dormant-contact hidden cost entirely.
  • Covers both jobs in this category from one account: marketing campaigns and a genuine transactional API with inbound parsing, webhooks, and message logs.
  • The real-time collaborative email editor with comments and locked sections is unique in this category and removes an entire review cycle for teams.
  • MJML, the open-source responsive email markup language Mailjet created, is genuinely good and is used far beyond Mailjet's own customer base.

Limitations

  • Automation is Premium-only and simple, with none of the branching or behavioural depth of ActiveCampaign, Klaviyo, or Omnisend.
  • Segmentation does not exist below the Essential tier, so the cheap plans are broadcast tools rather than marketing platforms.
  • No landing pages, webinars, events, courses, or CRM; Mailjet is email and nothing else, which limits how much of a stack it can consolidate.
  • The free plan's 200-emails-a-day cap makes it close to unusable for real campaigns, and it takes five days to mail a full 1,000-contact list.

Sender

Strengths

  • The most generous free tier in the category: 2,500 subscribers and 15,000 emails a month with automation, landing pages, and popups intact rather than stripped out.
  • Paid plans starting at single-digit dollars with a 30 percent annual discount, undercutting almost every competitor at the same list size.
  • Transactional email API and SMTP included on every plan including free, which no other budget marketing platform offers.
  • Automation workflows available on the free plan, where most competitors reserve them for paid tiers.

Limitations

  • Pricing above the entry point is set on a slider rather than published as a static table, which makes budgeting for a large list harder than it should be.
  • Automation is competent but a clear tier below ActiveCampaign, Klaviyo, and Omnisend on conditional logic and ecommerce personalisation.
  • A team of roughly thirty people supporting over 180,000 accounts means support is a ticket queue on the lower tiers, with phone support only on Enterprise.
  • The transactional feature is a convenience rather than infrastructure: no message stream separation, no inbound parsing, and nothing resembling Postmark's or Mailgun's logging and observability.

Pricing compared

Mailjet

Metered on monthly emails sent rather than on contacts stored, with unlimited contacts on the Essential tier and above. Four published tiers plus a quoted Custom tier, scaling with send volume.

  • Free$0
  • Starter$9
  • Essential$17
  • Premium$27
  • CustomQuoted

Because Mailjet meters sends rather than contacts, the standard comparison points need translating. A 1,000-contact list mailed once a month is 1,000 emails, comfortably inside the free plan, though the 200-a-day cap means the send takes five days; $9 on Starter fixes that. A 10,000-contact list mailed once a month is 10,000 emails, inside the $17 Essential tier with room to spare, against $120 to $275 on Constant Contact and $100 to $135 on AWeber for the same list. A 50,000-contact list mailed once a month is 50,000 emails, which needs a higher volume step but still lands far below the $430 to $575 Constant Contact charges. Mail that same 50,000-contact list weekly and the picture changes: 200,000 emails a month moves Mailjet up several volume steps while the contact-priced platforms charge exactly the same as before. Mailjet is outstanding value for a large list mailed occasionally and merely competitive for a small list mailed often. Add the transactional API on the same account, which replaces a separate Postmark or Resend subscription for low-volume application mail, and the total-cost case for a small business gets stronger still.

Sender

Subscriber-based subscription with a monthly send allowance set as a multiple of list size, priced on a slider rather than in a published static table. Prepaid email credits are available as an alternative for occasional senders.

  • Free Forever$0
  • StandardFrom $7
  • ProfessionalFrom $14
  • EnterpriseCustom

At the volumes this directory compares, Sender is the cheapest credible option on the list. A 1,000-subscriber list is entirely free, including automation, landing pages, and popups, where Constant Contact would charge $30 to $110 and AWeber $20 to $45. A 10,000-subscriber list moves onto a paid tier whose price the slider sets from the $7 and $14 entry points, and which in practice lands well below the $120 to $275 Constant Contact charges and the $100 to $135 AWeber charges at the same size. Fifty thousand subscribers likewise sits far below the $430 to $575 range at Constant Contact. The send multipliers of twelve and twenty-four times are competitive, sitting between Constant Contact's ten to twenty-four and AWeber's ten to twelve. What the low price does not buy is depth: the automation is a tier below the serious platforms, the reporting is thinner, there are no events or webinars, and support is a small queue rather than an organisation. For a business whose email needs are a newsletter, a welcome flow, a cart recovery sequence, and occasional SMS, Sender delivers all of it for less than anything else here.

Editorial verdict on each

Mailjet

Mailjet is the one platform in this category that meaningfully changes the arithmetic rather than the feature list. Metering emails sent instead of contacts stored, with unlimited contacts from $17 a month, makes it dramatically cheaper than everything else here for a business with a large list it mails occasionally, and it removes the dormant-contact hidden cost entirely. Add a genuine transactional API with inbound parsing and sub-accounts on the same account, European data centres, the only real-time collaborative email editor in the category, and MJML, and the case for a small European business is strong. The limits are equally clear. Automation is Premium-only and shallow, segmentation does not exist below Essential, there are no landing pages or events or CRM, and the free plan's 200-a-day cap makes it a demo rather than a plan. On the transactional side Sinch clearly reserves the depth for Mailgun. Buy Mailjet when your send pattern favours per-email pricing, when you want both jobs from one vendor at low cost, or when EU hosting is a requirement. Buy something else if the automation is what you are actually shopping for.

Read the full Mailjet profile

Sender

Best Value

Sender is the best answer in this category to the question of how little you can pay. The free tier at 2,500 subscribers and 15,000 emails a month, with automation workflows, ten landing pages, popups, and a transactional API included, is more than several competitors give you on a paid plan, and the paid tiers start at single-digit dollars with SMS and A/B testing added. For a solo operator, a small ecommerce store, or any business under a few thousand subscribers, it is very hard to justify paying Constant Contact ten times as much for something that does the same job less generously. The limits are honest ones. The automation is a tier below the serious platforms, the reporting is thin until the Professional plan, there are no events or webinars, and roughly thirty people are supporting over 180,000 accounts, so support is a queue and the integration ecosystem is small. The transactional feature is a convenience, not infrastructure, and should not replace Postmark or Resend for a real dependency. Pricing above the entry point also lives on a slider rather than a published table, so read it for your own list before budgeting. Within those limits, this is the most email per dollar available to a small business today.

Read the full Sender profile

Mailjet profile last reviewed 2026-08-22; Sender last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.