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Email Marketing Tools with A/B Testing

If A/B testing is one of the main features you care about, the question is not just whether a platform has split testing. The real differences are what you can test, how easy the workflow is, and whether the tool is good enough overall for the rest of your email program.

Why A/B Testing Matters

Small improvements in open rates and click-through rates compound over time. A/B testing lets you make data-driven decisions about subject lines, content, and send times instead of relying on guesswork.

What We Looked For

We looked for platforms that support testing at least subject lines and email content, with automatic winner selection based on performance metrics.

42 Tools with A/B Testing

#1

Instantly.ai

Cold email at scale with unlimited accounts and AI-powered warmup

4.8/5

Instantly.ai is a cold email platform built for volume, offering unlimited email accounts, AI-powered warmup, and inbox rotation to maximize deliverab...

From $37/mo Automation
#2

Moosend

All-in-one email marketing and automation

4.7/5

Moosend is a budget-friendly email marketing platform that punches above its weight class. Despite its low price point, it offers solid automation, tr...

From $9/mo Automation
#3

EngageBay

All-in-one CRM for marketing, sales & support

4.7/5

EngageBay is a bootstrapped all-in-one CRM platform that bundles marketing automation, sales pipeline management, helpdesk ticketing, and live chat in...

Free plan available SMS Automation
#4

Apollo.io

Sales intelligence platform with 210M+ contacts and built-in outreach

4.7/5

Apollo.io is the leading sales intelligence platform with a 210M+ contact database, built-in email sequences, dialer, and meeting scheduler. It earned...

Free plan available Automation
#5

Kit (ConvertKit)

Email marketing built for creators

4.6/5

Kit (formerly ConvertKit) is purpose-built for online creators including bloggers, podcasters, YouTubers, and course creators. It emphasizes simplicit...

Free plan available Automation
#6

MailerLite

Email marketing tools for growing businesses

4.6/5

MailerLite is known for its simplicity, affordability, and clean design. It's one of the best options for small businesses and beginners who want prof...

Free plan available Automation
#7

Klaviyo

The platform for unified customer data

4.6/5

Klaviyo is the gold standard for ecommerce email and SMS marketing, particularly for Shopify stores. Its deep integration with ecommerce platforms ena...

Free plan available SMS Automation
#8

Omnisend

Ecommerce email and SMS made easy

4.6/5

Omnisend is an ecommerce-focused marketing platform that combines email, SMS, and web push notifications. It offers pre-built automation workflows for...

Free plan available SMS Automation
#9

tinyEmail

AI-powered email marketing built for Shopify stores

4.6/5

tinyEmail is an AI-powered email marketing platform purpose-built for Shopify and e-commerce stores, offering an unusually affordable volume-based pri...

Free plan available Automation
#10

Reply.io

AI-powered sales engagement across email, LinkedIn, calls, and SMS

4.6/5

Reply.io is an AI-powered sales engagement platform that unifies email, LinkedIn, calls, SMS, and WhatsApp into multichannel sequences for B2B outreac...

From $49/mo SMS Automation
#11

Smartlead

Unlimited mailboxes and warmup for cold email at scale

4.6/5

Smartlead is a cold email infrastructure platform built for agencies and high-volume senders, offering unlimited email accounts and warmup on every pl...

From $32/mo Automation
#12

Privy

Ecommerce email and SMS marketing built for Shopify stores

4.6/5

Privy is an ecommerce-focused email and SMS marketing platform built specifically for Shopify stores, combining conversion popups, email campaigns, an...

Free plan available SMS Automation
#13

ActiveCampaign

Marketing automation that drives growth

4.5/5

ActiveCampaign is widely regarded as having the best marketing automation capabilities in the email marketing space. It combines email marketing with ...

From $29/mo SMS Automation
#14

Brevo (Sendinblue)

The most approachable CRM suite

4.5/5

Brevo (formerly Sendinblue) stands out with its unique pricing model based on email volume rather than subscriber count. This makes it particularly at...

Free plan available SMS Automation
#15

beehiiv

The newsletter platform built for growth

4.5/5

beehiiv was built by the team behind Morning Brew's growth to 4 million subscribers. It's specifically designed for newsletter businesses with built-i...

Free plan available Automation
#16

Lemlist

Multichannel cold outreach with built-in email warmup and lead database

4.5/5

Lemlist is a multichannel cold outreach platform that combines email campaigns, LinkedIn automation, and cold calling with a built-in 450M+ lead datab...

From $55/mo Automation
#17

Woodpecker

B2B cold email tool with deliverability-first approach

4.5/5

Woodpecker is a B2B cold email tool founded in 2015 that takes a deliverability-first approach with built-in warmup, catch-all verification, and bounc...

From $29/mo Automation
#18

Mailmodo

Interactive AMP email marketing with in-email forms and surveys

4.5/5

Mailmodo is the pioneering interactive email marketing platform that uses AMP technology to let recipients fill forms, take surveys, book meetings, an...

From $49/mo Automation
#19

ConvertFlow

All-in-one conversion platform with personalized popups, forms, and landing pages

4.5/5

ConvertFlow is an all-in-one conversion platform that combines personalized popups, multi-step forms, landing pages, quizzes, and sticky bars to conve...

Free plan available Automation
#20

Drip

Marketing automation for ecommerce

4.4/5

Drip is a focused ecommerce marketing platform known for its powerful visual automation builder and behavior-based segmentation. It's designed specifi...

From $39/mo SMS Automation
#21

HubSpot Email Marketing

Email marketing powered by CRM data

4.4/5

HubSpot's email marketing is part of its complete Marketing Hub. While the free and Starter tiers offer competitive email marketing, the real power co...

Free plan available SMS Automation
#22

Elastic Email

Budget-friendly email delivery with marketing features

4.4/5

Elastic Email is a budget-friendly email delivery platform founded in 2010 that offers both transactional email API and marketing email capabilities. ...

Free plan available Automation
#23

Customer.io

Behavioral messaging platform for product-led SaaS and tech companies

4.4/5

Customer.io is a behavioral messaging platform built for product-led SaaS companies that need to trigger automated emails, SMS, push notifications, an...

From $100/mo SMS Automation
#24

Ortto

All-in-one CDP, marketing automation, and analytics platform for lifecycle marketing

4.4/5

Ortto (formerly Autopilot) is an all-in-one marketing platform that combines a Customer Data Platform, visual journey-based automation, and built-in a...

From $509/mo SMS Automation
#25

Braze

Rewrite the rules of customer engagement with AI

4.4/5

Braze is a leading enterprise customer engagement platform that enables brands to orchestrate personalized, cross-channel experiences at massive scale...

Enterprise pricing SMS Automation
#26

GetResponse

All-in-one marketing platform

4.3/5

GetResponse is a full-featured marketing platform that goes beyond email marketing to include webinars, landing pages, sales funnels, and marketing au...

Free plan available SMS Automation
#27

Mailchimp

Turn emails into revenue

4.3/5

Mailchimp is the most widely recognized email marketing platform, used by millions of businesses worldwide. Acquired by Intuit in 2021, it offers a fu...

Free plan available SMS Automation
#28

Zoho Campaigns

Affordable email marketing deeply integrated with the Zoho ecosystem

4.3/5

Zoho Campaigns is the email marketing arm of the Zoho ecosystem, launched in 2012 and designed to work directly with Zoho CRM, Zoho One, and 45+ other...

Free plan available SMS Automation
#29

Benchmark Email

Straightforward email marketing with all features on every plan

4.3/5

Benchmark Email is a multilingual email marketing platform founded in 2004 that takes an all-features-included approach, giving every user access to a...

Free plan available Automation
#30

Iterable

Campaigns are out. Moments are in.

4.3/5

Iterable is an AI-powered cross-channel marketing platform that helps brands create individualized customer experiences across email, SMS, push, in-ap...

Enterprise pricing SMS Automation
#31

AWeber

Powerfully simple email marketing

4.2/5

AWeber is one of the original email marketing platforms, serving small businesses since 1998. It offers the largest template library (600+) and an imp...

Free plan available Automation
#32

Keap

CRM-powered sales and marketing automation for small businesses

4.2/5

Keap (formerly Infusionsoft, founded 2001, acquired by Thryv in 2024) is a premium all-in-one CRM and marketing automation platform built for sales-dr...

From $249/mo SMS Automation
#33

MailerSend

Developer-friendly transactional email by the MailerLite team

4.2/5

MailerSend is a transactional email service built by the team behind MailerLite, launched in 2020 with over a decade of email deliverability expertise...

Free plan available SMS
#34

Constant Contact

Small business marketing made easy

4.1/5

Constant Contact is one of the most established email marketing platforms, particularly strong for small businesses and nonprofits. Its event marketin...

From $12/mo SMS Automation
#35

Campaign Monitor

Beautifully crafted email marketing

4.1/5

Campaign Monitor is particularly well-suited for agencies and brands that need polished, branded email campaigns. Its client management features and b...

From $12/mo SMS Automation
#36

Encharge

Email & marketing automation, simplified

4.1/5

Encharge is a marketing automation platform built for SaaS and product-led companies. It excels at behavior-based email sequences triggered by in-app ...

From $79/mo Automation
#37

Salesforce Marketing Cloud

Personalize every moment with the #1 AI CRM for marketing

4.1/5

Salesforce Marketing Cloud is the enterprise marketing automation suite within the Salesforce ecosystem, offering email, SMS, social, advertising, and...

Enterprise pricing SMS Automation
#38

Twilio SendGrid

Scalable email API trusted by developers worldwide

4/5

Twilio SendGrid is a cloud-based email delivery platform founded in 2009 and acquired by Twilio for $2 billion in 2019. It uniquely splits its offerin...

Free plan available Automation
#39

Mailjet

Collaborative email platform for teams with powerful API

4/5

Mailjet is a French-founded email platform (now owned by Sinch) that uniquely combines transactional and marketing email under one roof with real-time...

Free plan available SMS Automation
#40

Vero

Make every email, SMS, push count

4/5

Vero is a multi-channel customer engagement platform for product-led teams that need behavioral messaging. It enables personalized emails, push notifi...

From $49/mo SMS Automation
#41

Maropost

Unified commerce platform that connects every channel

3.9/5

Maropost is a unified commerce and marketing automation platform for mid-market ecommerce businesses. It combines email, SMS, social advertising, and ...

From $279/mo SMS Automation
#42

Venturz

Your all-in-one platform to build a successful startup

3.5/5

Venturz is an all-in-one startup platform that bundles website building, CRM, email marketing, community management, and helpdesk into a single subscr...

Free plan available SMS Automation

Frequently Asked Questions

What should I A/B test first in my email campaigns? +

Start with subject lines since they have the biggest impact on open rates. Once you have a baseline, test preheader text, send times, CTA button copy, and email layout.

How large does my email list need to be for A/B testing? +

You typically need at least 1,000 subscribers per variant to get statistically meaningful results. With smaller lists, focus on testing high-impact elements like subject lines.

What is multivariate testing in email marketing? +

Multivariate testing lets you test multiple variables simultaneously, like subject line and sender name together. It requires larger lists but reveals how different elements interact with each other.

How long should I run an A/B test before picking a winner? +

Most platforms wait 1-4 hours for sufficient data before automatically sending the winning version to the rest of your list. For smaller lists, waiting 12-24 hours gives more reliable results.