Top Email Marketing Software for B2B Teams

The top email marketing software right now splits by use case: Klaviyo leads for ecommerce brands that need revenue attribution and native SMS, Brevo and ActiveCampaign lead for budget-conscious B2B teams that want automation without a steep price curve, and HubSpot leads for companies that want email tied directly into a CRM and sales pipeline. There is no single platform that wins every category — the right pick depends on your list size, your budget, and whether email needs to talk to the rest of your revenue stack. This guide compares the six platforms B2B and B2C teams shortlist most often, with real pricing, real trade-offs, and a framework for narrowing it down fast.

What is email marketing software?

Email marketing software is a platform for designing, sending, automating, and measuring email campaigns to a list of subscribers or customers — everything from a one-off newsletter to a multi-step nurture sequence that fires based on someone’s behavior. At its core, every platform on this list handles the same four jobs: building emails (usually with a drag-and-drop editor), managing and segmenting a contact list, automating sends based on triggers like a signup or a purchase, and reporting on opens, clicks, and revenue.

Where platforms actually differ is depth: how sophisticated the segmentation and automation logic can get, how well the tool integrates with ecommerce or CRM data, and how the pricing scales as your list grows. Those differences are what make “best email marketing software” a genuinely different answer depending on who’s asking.

Email is still one of the highest-leverage channels a business has. Roughly 93% of B2B marketers use email to distribute content, and about 81% use it to stay connected with their audience — it remains the most widely used owned channel in B2B marketing by a wide margin, ahead of paid social or search retargeting for most teams’ budgets.

Top email marketing software at a glance

Here’s how the six most-compared platforms stack up on price, best-fit audience, and their single biggest differentiator. Pricing below reflects each platform’s published entry-level and mid-tier plans at small list sizes; all of them scale up sharply as your contact count grows, which is covered in more detail in the cost section further down.

The platforms, compared in detail

Each of these tools is a genuinely capable email platform — the differences show up in who they were built for and where the pricing starts to bite. Here’s what each one actually does well, and where it falls short.

Mailchimp: the default choice, but no longer the automatic best one

Mailchimp built its reputation on being the easiest platform to pick up, and that’s still true — the drag-and-drop editor, template library, and onboarding flow are the most beginner-friendly of the group. Its paid plans run roughly $13–20 a month at entry-level list sizes. The catch is that Mailchimp’s free plan has been scaled back considerably from what long-time users remember, automation features are increasingly gated behind higher tiers, and pricing climbs steeply once a list crosses a few thousand contacts. For a team that just needs to send a clean monthly newsletter, it’s still a reasonable default. For a team that needs real behavioral automation, it’s usually not the cheapest way to get there anymore.

Klaviyo: built for ecommerce, and it shows

Klaviyo’s paid email plans start around $20 a month, and the platform earns that premium with prebuilt ecommerce automation flows (abandoned cart, browse abandonment, post-purchase), deep segmentation based on purchase behavior, native SMS in the same platform, and revenue attribution that ties campaigns directly to dollars generated — not just opens and clicks. On comparison sites and review platforms, Klaviyo consistently scores higher than Mailchimp on segmentation depth, A/B testing sophistication, and integration APIs. The trade-off is that Klaviyo is overbuilt for a business that isn’t selling products online; a B2B services company with no ecommerce data feed won’t use most of what makes Klaviyo worth the price.

Constant Contact: simple, reliable, a little dated

Constant Contact’s plans run about $12 for Lite, $35 for Standard, and $80 for Premium at 500 contacts, with pricing scaling up steeply after that — a 25,000-contact list can run into the mid-hundreds per month. It’s a solid choice for small and local businesses that want broadcast email, basic segmentation, and event or RSVP tools without a learning curve. It doesn’t compete well against ActiveCampaign or Klaviyo on automation sophistication, and its positioning has increasingly shifted toward small-business and nonprofit senders rather than B2B revenue teams.

ActiveCampaign: the automation specialist

ActiveCampaign’s four tiers — Starter around $15, Plus around $49, Professional around $79, and Enterprise around $145 a month at 1,000 contacts — reflect a platform built around its visual automation builder, which lets teams design branching, multi-condition workflows that look and function more like a lightweight CRM than a simple email tool. That’s why it’s the most common recommendation for B2B teams that want automation depth without buying a full marketing automation platform. Contact-based pricing is the thing to watch: ActiveCampaign began charging new accounts for every contact on the list, including unsubscribed and bounced ones, which can inflate the bill for teams with messy list hygiene. There’s no free plan, only a 14-day trial.

Brevo: the budget play that scales differently

Brevo (formerly Sendinblue) prices around email volume rather than strict contact caps — plans start near $9 a month for the Starter tier, with a genuinely usable free plan that includes 300 emails a day and storage for up to 100,000 contacts, no credit card required. That volume-based model makes Brevo unusually cost-effective for a business with a large contact list that doesn’t email constantly, which is a common shape for B2B companies compared to ecommerce brands sending daily promotions. The trade-off shows up at the high end: Brevo’s Professional tier jumps to roughly $499 a month, a steep step up from its budget-friendly entry point, and automation on the free tier is capped to a subset of contacts.

HubSpot: email as one piece of the CRM record

HubSpot’s free tier covers basic email, forms, and landing pages at up to 2,000 sends a month, with HubSpot branding attached. Paid plans start around $15–20 per seat monthly for 1,000 marketing contacts, with the same overage structure common to CRM-attached tools — roughly $50 for every additional 1,000 contacts. The jump to Professional, at close to $890 a month with three seats and a mandatory five-figure-adjacent onboarding fee, is where HubSpot stops being an “email tool” and becomes a full marketing operating system. The real value proposition isn’t the email editor itself, which is fine but not best-in-class — it’s that every email send, open, and click becomes a data point on the same contact record your sales team already works from, without a separate integration to maintain.

How much does email marketing software actually cost?

Every platform on this list advertises a low entry price and then scales cost based on either contact count or email volume, and the gap between the advertised price and what a growing list actually pays is the single most common surprise buyers report. Contact-based platforms (Mailchimp, Klaviyo, Constant Contact, ActiveCampaign, HubSpot) charge more as your list grows, regardless of how often you actually email that list — a dormant subscriber from two years ago still counts against your tier on most of these tools. Volume-based pricing, which Brevo uses, charges based on how many emails you actually send in a month, which can be significantly cheaper for a B2B team with a large but infrequently-emailed contact base.

A few cost patterns worth knowing before you commit to a plan:

• Automation is often a paywall, not a feature. Several platforms — Mailchimp and Constant Contact among them — gate multi-step automation behind a mid-tier or higher plan, so the “starting price” you see in comparison charts often doesn’t include the automation you actually need.
• List hygiene affects your bill directly. On contact-based pricing, unsubscribed and bounced contacts can still count toward your tier depending on the platform and when you signed up, so a list that needs cleaning can quietly push you into a more expensive plan.
• Enterprise tiers often carry onboarding fees. HubSpot’s Professional tier, for example, comes with a mandatory onboarding charge on top of the monthly subscription — a cost that rarely shows up in a pricing-page comparison table.
• Annual billing typically saves 15–20% across most of these platforms, which matters if you’re comparing sticker prices rather than like-for-like billing terms.

How to choose the right platform for your team

The fastest way to narrow six options down to one is to answer three questions before you look at a single pricing page: what does your list actually look like today, what does the automation need to do, and does email need to talk to any other system you already run.

1. Start with list size and growth trajectory, not current features. A tool that’s affordable at 2,000 contacts can become the most expensive line item in your stack at 25,000. Model your cost at 2x and 5x your current list before committing.
2. Match the tool to your business model. Ecommerce data (purchases, cart behavior, product catalogs) is what makes Klaviyo worth its premium. A B2B services or software company without that data feed gets little extra value from an ecommerce-first platform.
3. Decide whether email needs to be CRM-connected. If your sales team needs to see email engagement on the same record as calls, deals, and account history, a standalone email tool with a shallow CRM integration creates a data-sync problem down the line — HubSpot or a CRM-native option solves that natively.
4. Weigh automation depth against your actual use case. Most teams use a fraction of the automation logic a platform like ActiveCampaign offers. If your needs are a welcome series and a handful of nurture sequences, a cheaper platform with basic automation may outperform an expensive one on cost-per-outcome.
5. Check where email fits into the rest of your outbound motion. For B2B teams running coordinated outbound across email, LinkedIn, and calls alongside inbound nurture, it’s worth evaluating whether a dedicated email tool or a broader AI sales automation platform that includes email sequencing is the better long-term fit — that’s the kind of side-by-side comparison worth seeing directly by booking a demo rather than piecing together from marketing pages.

Common mistakes teams make when picking a platform

A handful of avoidable mistakes account for most of the “we outgrew our email tool” migrations teams go through within a year of signing up.

• Choosing on price alone. The cheapest entry tier is frequently the plan without the automation, segmentation, or integrations a team ends up needing within a quarter, forcing an upgrade that erases the original savings.
• Ignoring list growth in the pricing model. Teams price out a platform at their current contact count and get blindsided by the bill at double that size, particularly on platforms that charge for unsubscribed or bounced contacts.
• Underestimating the CRM integration gap. A “native integration” badge on a pricing page doesn’t always mean two-way, real-time sync — some integrations only push a subset of fields or update on a delay, which quietly breaks sales visibility into email engagement.
• Treating all “automation” as equal. A tool that can send a single triggered email is not the same as one that can branch a sequence based on five different behavioral conditions. Read the actual automation builder documentation, not just the feature list.
• Picking based on a competitor’s stack rather than internal fit. “Everyone in our space uses X” is a weak reason on its own if your list size, sales motion, or budget don’t resemble the company you’re copying.

Where AI is changing what “email marketing software” means

Traditional email marketing software was built to send and track campaigns to a list you already have. The newer category of AI-driven sales tools does something different: it identifies who to email in the first place, based on buying signals and account activity, then writes and sequences the outreach automatically rather than relying on a marketer to build the segment and the flow by hand. Roughly 57% of marketers at larger companies already report using AI somewhere in their email marketing process, and adoption is climbing fastest among teams that need outbound email to scale without adding headcount.

This is a genuinely different job than what Mailchimp, Klaviyo, or Constant Contact were built to do. Those platforms are strong at designing and sending campaigns to an existing list. A platform built specifically for AI-driven outbound handles the earlier step — surfacing which accounts are worth emailing based on intent and fit — and then writes and personalizes the sequence itself, often alongside LinkedIn and call touches rather than email in isolation. Salesworx.ai’s own AI sales copilot works this way: it draws on account intelligence to prioritize who gets an email at all, not just how that email gets designed once you’ve already decided to send it. For teams evaluating both categories, the practical question is whether the bottleneck is campaign execution (a job traditional email software solves well) or lead prioritization and personalized outreach at scale (a job built for AI-native tools). You can compare the two approaches directly in our breakdown of AI email marketing tools built specifically for B2B outbound.

None of this makes traditional email marketing software obsolete — automated workflows already generate roughly 320% more revenue than manual sends, and a well-run Klaviyo or ActiveCampaign account captures a lot of that value today. It does mean the category is splitting: campaign-execution tools on one side, and account-prioritization-plus-outreach tools on the other, with more B2B teams running both rather than picking one.

Frequently asked questions

What is the best email marketing software overall?

There isn’t one best platform for every business — Klaviyo is generally considered the strongest choice for ecommerce brands, ActiveCampaign and Brevo lead for B2B teams that want automation on a budget, and HubSpot is the strongest fit for teams that want email tied directly into their CRM. Mailchimp remains a reasonable general-purpose default for simple, low-volume sending.

What is the best free email marketing software?

Brevo’s free plan is one of the more generous options currently available, offering 300 emails a day and storage for up to 100,000 contacts with no credit card required. HubSpot and Mailchimp both offer usable free tiers as well, though HubSpot’s free plan is capped at 2,000 sends a month and carries HubSpot branding, and Mailchimp’s free tier has been reduced significantly from earlier versions.

How much does email marketing software cost per month?

Entry-level paid plans generally run $9–20 a month for a small list (roughly 500–1,000 contacts), but pricing scales quickly with list size. A list in the 25,000-contact range can push monthly costs into the hundreds of dollars on most contact-based platforms, and enterprise tiers on CRM-attached tools like HubSpot can run into the thousands once onboarding fees and seat counts are factored in.

Is Mailchimp still worth using?

Mailchimp is still a solid choice for straightforward, low-volume email sending and remains one of the easiest platforms to learn. It’s less competitive than it used to be on automation depth and free-tier generosity, and teams with more sophisticated segmentation or automation needs frequently find better value elsewhere.

Is Klaviyo worth it for a B2B company?

Usually not, unless the business has an ecommerce component. Klaviyo’s core strengths — purchase-based segmentation, cart-abandonment flows, and revenue attribution tied to product sales — are built around ecommerce data that most B2B service and software companies don’t generate, making a platform like ActiveCampaign, Brevo, or HubSpot a more efficient fit.

Does email marketing software integrate with a CRM?

Most platforms offer some level of CRM integration, but the depth varies widely — some sync in real time and in both directions, while others only push a limited set of fields on a delay. HubSpot avoids the integration question entirely by keeping email and CRM data on the same contact record from the start, which is the main reason teams choose it over a standalone email tool.

What’s the difference between email marketing software and an AI SDR or AI sales copilot?

Email marketing software sends and tracks campaigns to a list you already have. An AI SDR or AI sales copilot does an earlier and different job: it identifies which accounts are worth reaching based on buying signals and fit, then writes and sequences personalized outreach — often across email, LinkedIn, and calls — automatically. Many B2B teams now run both: a traditional platform for newsletters and nurture campaigns, and an AI-native tool for prioritized, personalized outbound.