Email software for enterprise, chosen for control and speed.

Customer.io suits enterprises where a central data team owns customer events and several product or marketing groups build messages on top of that data. Its strength is event-driven journeys: a customer action, such as a plan change or a failed action in the product, can start a workflow across email, push, SMS and in-app messages. That is the reason it appears first in this guide. Central teams can set the rules, and divisions can build inside them.

Pricing has two parts. The Essentials plan starts at $100 a month. Profile-based Essentials tiers are $145 a month at 10,000 profiles, $235 at 20,000, $325 at 30,000, $415 at 40,000 and $505 at 50,000 profiles and above, all billed monthly. The Premium plan is listed at $1,000 a month with custom profile volume, elevated AI Agent limits and premium support. Ask for Premium scope in writing before you budget for it.

Where it falls short: it asks for data staffing. Someone has to define events, name them consistently and keep the data clean, and that work is real before the first journey runs. Costs scale with profiles and message volume, so model peak volume before signing. Check which data integrations your plan includes, because the Essentials tier lists basic data integrations. Source: customer.io/pricing.

ActiveCampaign fits enterprises where sales and marketing work from one contact and deal record. Journeys, segmentation and pipeline sit in the same place, which removes the sync work that appears when a separate email tool feeds a CRM. Enterprise-level control arrives with the top plans: the Enterprise plan adds premium segmentation and a dedicated account team, and Pro adds advanced segmentation.

Pricing starts at $15 a month on the Starter plan for 1,000 email contacts. Plus is $49 a month, Pro is $79 a month and Enterprise is $145 a month, each at the 1,000-contact starting point. The listed price is the same per month whether you bill monthly or annually. Larger contact bands are not in the pricing record used for this guide, so ask for a quote for those.

Where it falls short: it is a CRM-led platform, not a warehouse-native one. If your central team wants raw event pipelines feeding every message, ActiveCampaign will need a separate data layer. Costs are contact-based, so an enterprise with overlapping contact lists across divisions should rationalise those lists before signing. Source: activecampaign.com/pricing.

Klaviyo is the right shortlist entry for retail and ecommerce enterprises whose messages depend on catalogue data, purchase history and product feeds. Its profile model suits brands running several storefronts or regional sites that want one customer profile behind every message.

The free plan covers 250 active profiles, 500 email sends a month and $5 of mobile messages. The email plan is $20 a month for 500 profiles, $30 for 1,000, $60 for 2,500, $100 for 5,000, $150 for 10,000 and $400 for 25,000 profiles, all listed monthly. SMS is priced separately as an Email+SMS plan.

Where it falls short: pricing is per profile. If a customer appears in several divisional accounts, you pay for that profile more than once. Build one shared profile store before you let each division open its own account. Klaviyo is less suited to non-retail businesses that need B2B-style account and pipeline management. Source: klaviyo.com/pricing.

Brevo works for subsidiaries and regional teams that need multi-channel basics at a predictable price. The free plan allows 300 daily email sends with storage for up to 100,000 contacts, which lets a regional group start without a budget request.

Paid plans are priced by monthly email volume. Starter is $9 a month and starts at 5,000 emails a month with no daily sending limit. Standard is $18 a month at the same volume and adds automation, A/B testing and advanced reports. Professional is $499 a month for 150,000 to 10 million monthly sends and up to 2 million contacts. On the yearly toggle the same tier shows $449.08 a month after a 10% discount.

Where it falls short: governance and approval controls are thinner than at the top of this list, so check roles, approvals and sender permissions during the trial. Source: brevo.com/pricing.

Mailchimp suits departments that already know the tool and need newsletters or team-level campaigns sent without retraining. Familiarity cuts onboarding time, and that matters when a group must send next week rather than next quarter.

The free plan covers up to 250 contacts and 500 sends a month. The Standard plan starts at $20 a month for the 500-contact selector, with up to 6,000 emails a month at that size. At 2,501–5,000 contacts it is $100 a month with up to 60,000 emails, and at 5,001–10,000 contacts it is $135 a month with up to 120,000 emails. At 10,001–15,000 contacts it is $230 a month with up to 180,000 emails.

Where it falls short: central governance is light. A group that needs approval chains for external sends, or strict brand locking across many divisions, will have to build those rules through process rather than the platform. Source: mailchimp.com/pricing.

Drip is a fit for ecommerce divisions that want visual workflows and pricing tied to active people rather than total list size. Several tiers include unlimited email sends, which keeps costs predictable when a division runs frequent promotions.

Plans are priced by people count. The 1–2,500 people tier is $39 a month with unlimited email sends and up to 50 workflows. The 4,501–5,000 tier is $89 a month, the 9,001–10,000 tier is $154 a month and the 22,501–25,000 tier is $369 a month, which adds free migration and personalised onboarding. Drip offers a 14-day free trial with no credit card and no ongoing free plan.

Where it falls short: the 50-workflow cap on lower tiers can bind for a large division, and enterprise-level governance is thinner than on the top two platforms. Source: drip.com/pricing.

Campaign Monitor fits brand-controlled organisations where a central team sets the design system and regional teams fill in the content. Template-led campaign building is its main appeal. It is a campaign tool first, so it is better at consistent output than at complex customer journeys.

The 500-contact band costs $13 a month on Lite when billed monthly or $11.70 a month billed annually. Essentials is $31 a month monthly or $27.90 annually, and Premier is $171 a month monthly or $153.90 annually, with phone support included. The trial offers 30 days with 500 contacts and a 500-email limit. For larger contact bands, request a quote.

Where it falls short: journey depth is limited, so a division that needs event-triggered flows across several channels will need another tool beside it. Source: campaignmonitor.com/pricing.

Start with the question that decides the rest: who owns the customer data? If one central team defines events and wants every message to draw on those events, the shortlist is Customer.io first, then ActiveCampaign if the sales team needs the same record. If the data sits in a commerce platform and the business sells products, Klaviyo's profile model fits better. If the buyer is a set of semi-independent divisions with small budgets, Brevo, Mailchimp and Drip are the cost-led options.

Second, decide how much control you need over sending. Campaign Monitor's template model suits brand teams that must keep layouts consistent. Mailchimp and Brevo rely more on process to govern sends, so an enterprise using them should write approval rules into its own workflow and check the platform's roles during a trial.

Third, price the peak, not the average. Enterprise lists grow through acquisitions and new regions, so price the band you will reach in eighteen months, not today. The table above shows how fast the cost moves between bands on Customer.io, Klaviyo and Drip.

Enterprise migrations fail on data, not on the send screen. Before a division moves, settle who owns each data field, how consent and suppression are carried across, and how sending domains are authenticated. Those steps are the same whichever platform you choose, so write them once and reuse them for each division.

Run the first migration as a pilot in one division with a clear exit test: deliverability on the new sending domain, suppression behaviour, and one full live campaign and automation cycle. Keep the old platform running until the new one has passed that test.

Procurement reviews usually ask the same questions, so prepare them in advance. Ask each vendor which single sign-on and role options are included on the plan you are buying, since security features often sit on higher tiers. Ask where data is stored, which data-processing agreements are available and how deletion requests are handled across sending accounts.

Ask about approval workflows for external sends and about audit logs for who changed a template or an automation. Ask about sandbox or test environments, because a divisional team that cannot test safely will push its work into production. Finally, confirm what the price includes: messages, profiles, workflows, support and migration. A plan that looks cheap on the pricing page can be missing controls that the enterprise needs.