THE 10 ESPS MOST SMALL BUSINESS ACTUALLY USE

The Email Marketer's Field Guide ★ Reference Edition · May 2026

Six questions every email marketer needs answered before recommending a platform to a client — pricing thresholds, automation depth, segmentation flexibility, best-fit use case, support quality, and the deliverability infrastructure underneath it all.

—Platform	01Pricing threshold	02Automation depth	03Segmentation & tagging	04Best for	05Support	06Deliverability / Infra
Mailchimp est. 2001 · Intuit	$0 → 250 Free up to 250 contacts / 500 sends per month. Paid plans start at ~$13/mo Essentials. Bills all contacts including unsubscribes and duplicates across audiences.	Basic Multi-step automation removed from free tier in 2025. Customer Journeys decent on Standard+, but workflow logic is shallower than ActiveCampaign or Klaviyo.	Moderate Tags + segments + audiences (siloed). Predictive segmentation locked to Standard. Tagging on signup forms is manual.	All-purpose SMB Brand recognition, newsletters, basic e-comm. Best if you want a familiar name and built-in CRM/landing pages.	Limited (free) 30 days email/chat support on free, then community only. 24/7 email/chat on Essentials+. Phone on Premium.	Proprietary MTA Shared IP pools by default. Dedicated IPs on Premium. Mandrill (separate add-on) for transactional.
Klaviyo est. 2012 · NYSE: KVYO	$0 → 250 Free up to 250 active profiles / 500 sends. Paid starts at $20/mo. Bills on total active profiles (since Feb 2025), not just emailed contacts — Shopify sync can blow past 250 fast.	Advanced Best-in-class for e-comm flows: abandoned cart, browse abandon, post-purchase, win-back, predictive analytics, CLV-based triggers, branching logic.	Deep Dynamic segments rebuild in real time. Filters on any event, purchase property, or behavior. Industry-leading for e-comm slicing.	E-commerce / DTC Shopify, WooCommerce, BigCommerce stores serious about revenue per recipient.	Tiered 60 days email support on free, then community only. Email + chat on paid; phone on higher tiers. Klaviyo Academy is excellent.	Proprietary MTA Shared IP infrastructure with strong reputation. Dedicated IPs available for accounts sending 1M+ /month. Suppresses cross-account hard bounces automatically.
Brevo f.k.a. Sendinblue	$0 → 300/day Unlimited contacts on every plan including free. You pay by email volume, not list size. Free = 300/day. Paid from ~$9/mo for 5,000 sends.	Moderate Visual workflow builder with transactional + marketing in one. Capable but not as deep as ActiveCampaign or Customer.io.	Moderate Contact attributes, lists, and dynamic segments. Built-in CRM lets you segment on sales data without an integration.	Large list / Low send Best when you have a huge list but don't email everyone often (e.g., transactional + occasional marketing). Strong for EU/GDPR.	Solid Email support on all plans. Phone access on Business and BrevoPlus. Multilingual support is a standout.	Proprietary MTA Runs its own SMTP infrastructure — marketing + transactional on one stack. Dedicated IPs available. Strong deliverability monitoring team.
MailerLite est. 2010 · Vilnius	$0 → 500 Free up to 500 subscribers / 12K sends per month. Growing Business from $10/mo at 500. Among the cheapest at every tier.	Moderate Clean visual automation builder. Triggers on signup, click, date, anniversary. Multi-trigger workflows on Advanced plan.	Easy Tags applied via forms, groups, and automations. Interest-based segments are simple to build. Tagging UX is genuinely easy for non-technical users.	Beginner SMB First-time email marketers, solopreneurs, service businesses, small content creators. Best learning curve in the space.	Friendly 24/7 email and chat on paid plans. Live chat is responsive. Limited support on free tier.	Proprietary MTA Strong reputation for inbox placement; consistently rates well in independent deliverability tests. Dedicated IPs available on Advanced.
ActiveCampaign est. 2003 · Chicago	$15 → 1,000 No free plan. 14-day trial. Starter from $15/mo at 1K contacts (annual commitment now required on monthly plans). Climbs steeply: ~$149/mo at 10K.	Advanced The gold standard for non-e-comm automation. Conditional branching, lead scoring, goals, split-paths, site tracking, CRM-aware triggers, omnichannel (email/SMS/WhatsApp).	Deep Tags + custom fields + dynamic lists + automation-driven segmentation. Best-in-class tagging logic; can tag based on virtually any behavior.	B2B / Service / Course Coaches, consultants, SaaS, agencies, course creators — anyone who needs sales pipeline + email + CRM tied together.	Tiered 24/7 chat on all paid plans. Phone reserved for Enterprise. Onboarding included on Plus+.	Proprietary MTA Strong deliverability reputation. Shared IPs with engagement-based routing. Dedicated IPs on Enterprise. Built-in deliverability tools.
Customer.io est. 2012 · Portland	$100 → 5,000 No free plan. 14-day trial. Essentials starts ~$100/mo for 5,000 profiles. Premium and Enterprise are quote-based. Built for teams with real budget.	Advanced Event-driven workflows triggered by real-time custom events and user attributes. API-first. Best-in-class for product-led, behavior-based messaging across email, SMS, push, and in-app.	Deep Unlimited custom attributes. Live segments rebuild on event ingestion. Reverse ETL and ad-audience sync for orchestrated journeys.	SaaS / Product-led SaaS, mobile apps, fintech, marketplaces. Overkill for newsletter-style senders; perfect for behavioral lifecycle messaging.	Technical Email and chat support. Documentation is dev-focused. Premium tiers get dedicated CSM and onboarding.	Built on AWS SES Sends through configurable infrastructure (Amazon SES or own SMTP). Dedicated IPs available. Transactional + marketing on the same engine.
Sendlane est. 2013 · San Diego	$100 → start No free plan. Starter from $100/mo. Pricing based on contacts + sends with overage charges. Higher tiers are quote-only.	Advanced Real-time behavior tracking, multi-step e-comm flows, deep Shopify integration. SMS + email under one roof with shared automations.	Deep Behavioral and purchase-based segments. Tag automation, predictive personalization, replenishment logic.	Mid-size DTC DTC brands that want Klaviyo-like depth but a lower SMS spend and more white-glove migration support.	White-glove 24/7/365 live chat on all plans. White-glove migration on Enterprise. Genuinely strong human support is a known differentiator.	Proprietary MTA Built on its own infrastructure with intelligence focused on e-comm sending patterns. Strong deliverability reputation in the DTC space.
Omnisend est. 2014 · London	$0 → 250 Free up to 250 contacts / 500 sends. Standard from ~$11.20/mo (2,500 contacts). Pro from $41.30/mo with unlimited email sends — predictable cost at scale.	E-comm focused Pre-built workflows for cart abandonment, post-purchase, browse, and product recommendations. Less flexible than Klaviyo but faster to launch.	Moderate Purchase-based and behavioral segments. Dynamic product blocks. Tagging via signup form and automation; less granular than Klaviyo.	Small e-comm Shopify, WooCommerce, BigCommerce stores wanting email + SMS + push without Klaviyo's price tag or complexity.	Strong 24/7 email and live chat on every plan including free. Pro accounts over $400/mo get dedicated Account Expert.	Proprietary MTA Strong e-comm deliverability. Shared IP pools with reputation isolation by sender quality. Solid Shopify integration.
Kit f.k.a. ConvertKit	$0 → 10,000 Most generous free tier in the industry. Newsletter plan free up to 10K subscribers (one automation, one sequence). Creator from $33/mo, Pro from $66/mo (Sept 2025 price hike).	Moderate Visual automation builder with unlimited workflows on paid plans. Tag-based logic is intuitive. Less robust than ActiveCampaign but cleaner for creators.	Tag-first Built around tags and segments rather than multiple lists — every subscriber is one record. Easy to tag on signup forms, link clicks, or purchases.	Creators / Newsletters Authors, bloggers, podcasters, course creators, paid newsletter operators. Built-in digital product sales and sponsor network.	Solid Email support on all plans. Live chat and priority support on Creator Pro. Free migration from another ESP on paid plans.	Proprietary MTA Strong inbox placement, particularly for plain-text-style sends popular with creators. Shared IPs. No dedicated IP option.
beehiiv est. 2021 · Morning Brew alums	$0 → 2,500 Free up to 2,500 subscribers with unlimited sends. Scale plan from $49/mo (1K subs) up to $109 at 10K. 0% platform fee on paid newsletters.	Basic Welcome sequences and basic automation only on free; richer flows on Scale+. Not built for complex behavioral journeys — built for newsletters.	Moderate Dynamic segments based on engagement, signup source, and custom polls/surveys. Tags + custom fields.	Newsletters / Growth Newsletter operators focused on growth and monetization — built-in ad network, paid referrals, recommendation network for cross-promotion.	Community Email support; live chat on Max plan. Community-driven help. Slower and less personal than ESPs aimed at SMBs.	Proprietary MTA Solid newsletter deliverability with engagement-focused sending. Shared IPs. Built specifically for high-volume editorial sends.
Campaign Monitor est. 2004 · Marigold	$12 → 500 No real free plan (5-subscriber sandbox only). Lite from $12/mo at 500 contacts; Essentials from $29; Premier from $159. Climbs sharply past 10K contacts.	Moderate Visual journey builder for welcome, re-engagement, and date-triggered flows. No advanced conditional branching or lead scoring.	Moderate Engagement-based segments, custom fields, and the new AI Segment Mapper. Solid but not as flexible as ActiveCampaign or Klaviyo.	Design-led brands Agencies, publishers, and design-conscious brands. Strongest templates and brand-control features in the space.	Standard Email and chat support on all plans. Phone support only on Premier. 24/7 add-on available on Lite/Essentials.	Proprietary MTA Strong, mature infrastructure. Global server routing for faster delivery. Consistent ~97%+ deliverability in independent tests.

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On Pricing "When do you start paying" refers to the threshold at which the listed free or trial plan stops working for a small business. Free tiers often hide caps on sends, automation, or branding that force an upgrade well before the headline subscriber limit.

On Contact Counting Mailchimp and Klaviyo bill on total contacts (subscribed + unsubscribed). Brevo bills on emails sent, not list size. The rest fall somewhere between. Always check the billing model before list growth, not after.

On Deliverability All ESPs listed run proprietary mail transfer agents on top of their own infrastructure (with Customer.io being the notable exception — it runs on configurable backends including Amazon SES). Shared IPs are standard; dedicated IPs are available for higher-volume senders, usually 100K+/month.

Disclaimer Pricing and feature thresholds verified May 2026 from each provider's documentation and third-party reviews. ESPs change pricing frequently — confirm on the provider's site before recommending to a client.

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Compiled for the working email marketer · The Email Marketer's Field Guide