Constant Contact vs MailerLite: SMB email

MailerLite’s send button blocks a non-compliant email; Constant Contact only names the law

MailerLite technically blocks a non-compliant send — postal address and unsubscribe link can’t be removed, and an error stops sending if either is missing — while Constant Contact requires a branded unsubscribe link and cites the TCPA for SMS opt-outs without ever stating whether a non-compliant send is technically blocked. Scope compared, criterion by criterion. Checked 14 September 2026.

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MailerLite vs Constant Contact: scope compared, criterion by criterion — checked September 14, 2026
Constant ContactMailerLite
What the tool answers
What it measures or produces
Constant Contact presents itself as "the #1 digital marketing platform for small businesses." Object handled: a contact database and campaigns (email, SMS, social, events, sign-up pages) with their reports.It produces email campaigns, automations, forms, landing pages and websites, then measures opens, clicks, unsubscribes, spam complaints, orders and revenue per campaign and per subscriber.
The job it equips
The vendor targets the small business and the nonprofit (a Nonprofit rate at -30%). Daily task: create, send and track campaigns. The Lite plan opens only one seat ("1 user license").The email marketing manager or independent creator who builds and mails their own list, designs the emails and tracks conversions without needing a developer.
What it cannot tell you
Below 1,000 contacts per tested line — the significance threshold the vendor recommends — Constant Contact still declares a winner without being able to say if it truly is one. Reports limited to campaigns sent from the platform.It does not relay transactional email: MailerLite provides no SMTP infrastructure and routes that use case to MailerSend, a separate product with its own pricing.
Send, deliver, measure
Deliverability
DKIM automatic on every account, no SPF to configure; dedicated IP absent. The vendor publishes two figures on the same date: 97% delivery rate (email marketing page), 98% inbox rate (Why us page) — the vendor publishes both.A dedicated IP requires fifty thousand weekly emails and one authenticated domain, with warm-up handled by the deliverability team; every new account must request approval before sending.
Editor and templates
No-code editor, AI drafting, BrandKit, PDF, Canva, free-form HTML. On templates, one page shows 700+ in the title, 600+ in the meta description, another says "hundreds" — the vendor publishes all three.Three editors coexist, drag-and-drop with over seventy content blocks, a simple editor and free-form HTML; over fifty pre-designed templates, restricted to the Comfort and Power plans.
Segmentation
Custom segments capped by contact tier: 1 on Lite, 10 on Standard, unlimited on Premium. Named criteria: engagement (opens/clicks) and click. Full criteria list and any condition cap per segment absent.Dynamic segments recalculate continuously, with filters on custom fields, groups and automation activity; no cap on the number of conditions is published by the vendor.
Automated journeys
Automation templates capped by tier: 1 on Lite, 3 on Standard, unlimited on Premium. Named triggers: sign-up, abandoned cart, birthday, browsing, purchase; one conditional branch documented. Max steps unpublished.Seven standard triggers plus e-commerce triggers; three active automations on free, fifty on Comfort, unlimited on Power, which alone allows three triggers per workflow.
A/B testing
A/B testing (subject line): each variant gets up to 50% of contacts, recommended from 1,000/line; the winner alone goes out after the chosen wait. Absent from Lite, subject-only on Standard, "+ dynamic" on Premium.Subject line, content, sender name and send time are testable, up to five versions of one element; a slider sets the sample and the winner goes out automatically to the remainder.
Billing unit
Billing = plan plus a contact tier, that tier set by the highest active-contact count ever reached — deleting contacts doesn't lower it. Monthly send: 10x contacts on Lite, 12x on Standard, 24x on Premium; overage at $0.002/send.Billing is per active subscriber in tiers, paired with a monthly sending cap; exceeding either subscribers or sends triggers an automatic tier increase charged pro-rata.
GDPR compliance
DPA based on the EU Standard Contractual Clauses and the UK Addendum, no longer on Privacy Shield. Double opt-in exists but stays optional. No numeric retention period; the DPA itself couldn't be retrieved (page blocked).Double opt-in is on by default on forms, the DPA is folded into the Terms with no separate signature, portability and erasure tools exist; no numeric retention period is stated.
CAN-SPAM and state-law compliance
A branded unsubscribe link (SafeUnsubscribe) required on every send; for SMS, TCPA cited, opt-out required, auto STOP. Postal address, deadline, named state laws and actual blocking absent: anti-spam and terms pages refused.MailerLite technically blocks non-compliant sending: the postal address and unsubscribe link can't be removed, an error blocks send if absent, one-click unsubscribe on by default. No numeric deadline or state law is published.
What comes out of it
Export formats
Contacts export as CSV/Excel, no row cap or plan restriction. Email reports in the same formats (plus PNG/PDF/CSV charts), but full report access is plan-capped. No export to Looker Studio, no Google Sheets connector.Subscribers export as CSV or CSV for Excel; a campaign report downloads as CSV and can be produced as PDF through the print function.
API access
The v3 API is free, with the vendor reserving the right to charge later. Competitors, reverse engineering and comparative use are barred; access can be terminated without cause. A Rate Limits page exists, figures not retrieved.A REST API is included, using Bearer tokens on connect.mailerlite.com/api, capped at 120 requests per minute, and 5 requests per minute on subscriber import endpoints.
What it connects to
Native integrations
"300+ apps" advertised. Three connectors matter: Shopify, Salesforce, QuickBooks; the list also names WooCommerce, BigCommerce, Square, Wix, HubSpot and others. An extra charge applies to all Zapier integrations.The directory advertises more than 130 connections; the three that matter are Shopify for e-commerce, WordPress for capture, and Zapier for everything else.
Bringing your existing data across
Data migration from MailChimp, named with Salesforce, HubSpot and ~20 other sources; VCF/TXT/CSV/XLS/XLSX file imports, copy-paste, business-card scanning. Neither automatic field mapping nor assisted migration described.Migration runs through a CSV export at the competitor then an import with field mapping; forms, templates and automations have to be rebuilt by hand.
Getting started, and the fine print
Support
Support by tier: "Live phone/chat" on Lite and Standard, a dedicated priority team on Premium. A US number published, plus an accessibility number; seven offices listed. Hours, time zone and support languages absent.Email support is 24/7 from the Comfort plan, 24/7 live chat is reserved for Power, priority support sits on Enterprise; free accounts get fourteen days then fall back to the community.
Where the data is hosted
The only hosting named: that of the Lead Gen & CRM product (Google Cloud Platform, AWS alongside) — not the email tool's. No country or region is named for the email platform itself; the Trust Center and terms were refused.Hosting runs on Google Cloud Platform in data centers located in Germany and the Netherlands; the DPA nonetheless permits worldwide processing framed by Standard Contractual Clauses.
What happens if you leave
Pricing promises a full refund within 30 days; the cancellation article says prepayments are non-refundable, even on early cancellation — the vendor publishes both. Data kept 30 days then deletable if the account is inactive.Cancelling downgrades the account to the free plan at the end of the cycle with data kept; deleting the account opens a twenty-five day grace period first.
Minimum seats billed
No minimum billed seats: every plan starts at one person, the advertised count being a ceiling (1 on Lite, 3 on Standard, unlimited on Premium). Price is counted per plan and per contact tier, not per seat.No minimum seat purchase applies: seats come bundled per plan, two on free, three on Comfort, unlimited on Power and Enterprise.
Data residency and regulated cloud
HIPAA ruled out for Lead Gen & CRM, so no BAA at any tier. The only region named (Google Cloud, AWS alongside) concerns that product, not email. Certifications cited are the hosts'. Neither FedRAMP, StateRAMP, GovCloud, nor SOC 2.MailerLite does not host in the United States: its data sits with Google Cloud, in Germany and the Netherlands. The vendor holds its own ISO/IEC 27001:2022 certification (its data centers are separately certified too) and states Data Privacy Framework compliance; SOC 2, FedRAMP, StateRAMP, GovCloud, and HIPAA/BAA are absent, with no tier published for any of them.
What it costs
The entry price and what it includes
Entry price: $12/month on Lite ($10.20/month prepaid annually), for the lowest contact tier — 1 user, 1 automation, 1 segment, no A/B testing. The contact tier this price corresponds to is unpublished.The Comfort plan starts at 12 US dollars per month billed monthly, with three seats, fifty active automations, pre-designed templates, A/B testing and round-the-clock email support.
What pushes the bill up
Four items inflate the bill: the contact tier (never drops back down), send overage ($0.002/send), SMS as an add-on (from $10/month on Lite/Standard), and Zapier (a surcharge on all integrations). Plus US sales tax in 37 states.Crossing the active subscriber tier triggers an automatic tier increase charged to the card, pro-rated against the time remaining in the billing cycle.
Sales tax and nexus
Sales tax charged in 37 states by billing address, nexus compliance on the vendor. Exemption via a state certificate in 2-4 days; 501(c) alone isn't enough. No-tax states: Delaware, Montana, New Hampshire, Oregon.MailerLite collects and remits sales tax on its own fees, in 16 states plus DC, at a combined state-plus-county rate by zip code. MailerLite bears its own nexus determination; no calculation is offered for customer sales.
Procurement and invoicing
Self-service payment; suspended on failure, cancelled after 75 days unpaid. Cards, PayPal, wallets Apple/Google/Amazon, Canadian debit, prepaid US check — never cash or purchase orders, no invoice, net-30 or W-9.MailerLite accepts only card, PayPal, Przelewy24, and Shopify payment (Shopify accounts) — no cash or checks — in EUR or USD by address. No non-card tier published: self-service only, even for Enterprise (100,000+ subscribers).

Key takeaways

One tool for the solo sender, one for the small business with a nonprofit rate

MailerLite is built for the email marketing manager or independent creator who builds, designs, and mails their own list without needing a developer. Constant Contact instead names the small business and the nonprofit as its buyers, offering a nonprofit rate discounted by thirty percent, while its entry-level Lite plan opens only one user license.

A send button that refuses non-compliance, and a page that only names the law

MailerLite technically blocks a non-compliant send: the postal address and unsubscribe link cannot be removed from a campaign, an error stops the send if either is absent, and one-click unsubscribe is on by default — though no numeric processing deadline or named state law appears on its own pages. Constant Contact requires a branded unsubscribe link on every send and cites the TCPA for text-message opt-outs with an automatic STOP reply, but its postal-address rule, its processing deadline, and any named state law are absent from the anti-spam and terms pages that were checked — pages that themselves refused to load.

Two delivery figures, published on the same page, on the same date

Constant Contact states a ninety-seven percent delivery rate on its email marketing page and a ninety-eight percent inbox rate on its Why Us page, both dated the same day — the vendor publishes both. MailerLite instead ties its own deliverability to a threshold: a dedicated IP requires fifty thousand weekly emails and one authenticated domain, with every new account needing approval before it can send at all.

A template count that changes between the title and the fine print

One Constant Contact page announces seven hundred plus templates in its title, six hundred plus in its meta description, and a separate page says simply “hundreds” — the vendor publishes all three counts at once. MailerLite states its own count directly: over fifty pre-designed templates, restricted to the Comfort and Power plans, alongside a drag-and-drop editor with more than seventy content blocks.

A refund window that exists on the pricing page and disappears in the help article

Constant Contact’s pricing page promises a full refund within thirty days, while its cancellation article states that prepayments are non-refundable even on early cancellation — the vendor publishes both. MailerLite makes no refund promise either way: cancelling simply downgrades the account to the free plan at the end of the cycle with data kept, and deleting it opens a twenty-five day grace period first.

Sales tax collected in sixteen states on one side, thirty-seven on the other

MailerLite collects and remits sales tax on its own fees in sixteen states plus the District of Columbia, at a combined state-and-county rate by zip code, and states plainly that it bears its own nexus determination. Constant Contact charges sales tax in thirty-seven states by billing address, with nexus compliance placed on the vendor as well, naming Delaware, Montana, New Hampshire, and Oregon as its no-tax states.

Data that sits in Germany and the Netherlands on one side, an unnamed region on the other

MailerLite hosts on Google Cloud Platform in data centers located in Germany and the Netherlands, under a Data Processing Agreement that still permits worldwide processing framed by Standard Contractual Clauses. Constant Contact names hosting only for its separate Lead Gen and CRM product, on Google Cloud Platform alongside AWS; no country or region is named for the email platform itself, and the Trust Center and terms pages needed to check further were refused.

Frequently asked questions

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jordan@bulldozer-collective.com
How does MailerLite’s A/B testing compare to Constant Contact’s?
On MailerLite, subject line, content, sender name and send time are all testable, with up to five versions of a single element, a slider setting the sample size, and the winner sent automatically to the rest of the list. On Constant Contact, only the subject line is tested, each variant getting up to 50% of contacts, recommended from 1,000 contacts per line, and the feature is absent on Lite, subject-only on Standard, with a dynamic option added on Premium. The choice depends on the plan you are on and which element you want to test.
Do MailerLite and Constant Contact hold the same certifications?
MailerLite holds its own ISO/IEC 27001:2022 certification for its information security management system, complies with the EU-U.S. and Swiss-U.S. Data Privacy Frameworks, and uses PCI-DSS compliant payment vendors. Constant Contact has no certification of its own: for Lead Gen & CRM, the vendor aligns with ISO/IEC 27001 without being certified, citing Google Cloud’s and AWS’s certification, and relies on Authorize.net for PCI-DSS; neither SOC 2, its own ISO 27001, nor HDS. A buyer who cares about certification needs to tell an editor’s own compliance apart from simply aligning with its host.
What exactly does the entry price of MailerLite and Constant Contact include?
MailerLite’s Comfort plan starts at 12 US dollars per month billed monthly, with 3 seats, fifty active automations, pre-designed templates, A/B testing and round-the-clock email support. Constant Contact’s Lite plan also starts at $12 per month ($10.20 per month prepaid annually), but for 1 user, 1 automation, one segment and no A/B testing; the contact tier that this price corresponds to is unpublished. An identical-looking entry price therefore covers very different inclusions.

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