ChatGPT answers, unedited

If your main requirement is cheap + subject-line A/B testing, I’d narrow it to these:

Humblytics AI EmailyMy shortlist:

1. Pick MailerLite if you want the lowest cost with real A/B testing.

It’s usually the best fit for a small list because campaign A/B testing is available on its free tier (with limits), and paid plans stay relatively inexpensive as you grow. Humblytics

2. Pick Brevo if your priority is volume pricing.

It can be cheaper when you send many emails because pricing is more send-volume oriented rather than purely subscriber-count oriented. AI Emaily

3. Pick Mailchimp if you value simplicity and integrations over price.

It has a polished workflow, but you may pay more as your list grows. AI Emaily

4. Pick Kit if you’re a creator/newsletter operator.

It’s built around creators and newsletters, but the cheaper tiers may not include all testing features. Humblytics

For a typical small business or newsletter, I’d start with MailerLite. If you tell me:

• your subscriber count (0–500, 500–5k, 5k+),
• whether this is a newsletter, ecommerce, or cold outreach,
• and your monthly email volume,

I can narrow it to the cheapest option that won’t force you to switch later.

If your main requirement is cheap + subject-line A/B testing, I’d shortlist these:

Humblytics EmailTooltester.comMy practical pick:

Best cheap choice: MailerLite

• Good fit if you have a small list and want to start testing without paying much.
• Supports campaign A/B testing, including subject-line tests, on its lower tiers (including a free option depending on current limits/features). Humblytics
• Simple editor and automation features without the complexity of larger platforms.

If you’re doing newsletters/creator emails:

Consider Kit (formerly ConvertKit), but check the current plan limits because A/B testing features vary by tier. Humblytics

If you’re running ecommerce:

Look at Klaviyo. It is more expensive as you grow, but its testing and segmentation are built around ecommerce use cases. AI Emaily

A few questions would change the recommendation:

1. How many subscribers do you have (or expect in 6 months)?
2. Is this for a newsletter, ecommerce, SaaS, or cold outreach?
3. Do you only need subject line tests, or also email content/automation A/B tests?

If your priorities are low cost + subject-line A/B testing, I’d narrow it to MailerLite vs. Brevo.

• MailerLite — a good fit if you have a relatively small list and send newsletters regularly. Its free plan supports up to 250 subscribers/2,500 monthly sends, while paid plans start around $9–$12 depending on the plan/volume. MailerLite MailerLite
• Brevo — attractive if your list is larger but you don't send extremely frequently, because pricing is based more on email volume than subscriber count. Its free tier allows 300 emails/day, but A/B testing is on the Standard plan, starting around $18/month. EmailTooltester.com TechnologyAdvice

The important catch: if A/B testing is a must-have, don't choose based solely on the free plan. Brevo's free/Starter tiers don't give you the full A/B-testing capability; you'll need Standard. TechnologyAdvice

So, for a small-to-medium newsletter where you want to keep costs down, I'd look closely at MailerLite first. If you tell me roughly how many subscribers you have and how many emails you send per month, I can compare the actual monthly cost of 3–4 options.

If your priority is cheap + A/B testing for subject lines, I’d pick MailerLite.

• MailerLite: Best budget choice. Its free plan includes campaign A/B testing, though it’s limited to 250 subscribers / 2,500 emails per month. Paid plans start around $12/month. Humblytics EmailTooltester.com
• Brevo: Better if you have a large list but send relatively infrequently. Its cheaper Starter plan begins around $9/month, but A/B testing requires the Standard plan (~$18/month). Stackmerit Compare Tiers
• Kit: Worth considering if you're primarily a creator/newsletter business, but subject-line A/B testing starts on its paid Creator tier, making it less attractive if price is the main concern. Humblytics

My recommendation

Start with MailerLite. You can actually test subject lines for free, and you don't need to pay just to unlock the basic A/B-testing capability.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which is cheapest for your specific situation.

If your main requirement is “cheap but still has subject line A/B testing,” I’d shortlist these:

My recommendation by scenario:

• Small list (<5,000 subscribers): pick MailerLite. It’s usually the best balance of price, ease of use, and testing features. humblytics.com
• You’re building a newsletter business: consider Kit if creator tools matter more than lowest price. humblytics.com
• You run ecommerce: look at Klaviyo, but it’s rarely the cheapest option. aiemaily.com
• You just need “send emails + test subject lines” cheaply: start with MailerLite.

A couple of things to check before choosing:

1. Does it test subject lines only, or also content/send time?
2. Does it automatically send the winning version?
3. Does pricing jump when your subscriber count grows?

If you tell me your subscriber count, whether this is for a newsletter, ecommerce, SaaS, or cold outreach, and your monthly budget, I can narrow it to one choice.

If cheap + A/B testing subject lines is the priority, I’d choose MailerLite.

• Best value: mailerlite.com — its free plan includes email A/B testing, including subject-line testing, with up to 250 subscribers and 2,500 emails/month. MailerLite MailerLite
• When you outgrow free: MailerLite’s paid Comfort plan starts at $12/month and adds more automation and testing features. MailerLite
• Alternative: brevo.com — its free plan is generous for contacts, but A/B testing starts on the Standard plan at $18/month, so it’s less attractive if testing is essential and budget is tight. Brevo Help Brevo Help

My pick: MailerLite, especially if you're starting small. You can test two subject lines without paying anything, then upgrade only when your list grows. MailerLite

If you tell me roughly how many subscribers you have and emails/month, I can tell you which plan is cheapest for your specific volume.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

• MailerLite: A/B testing is available even on the free plan, including subject-line tests. The free tier allows up to 250 subscribers and 2,500 emails/month. Paid plans start at $12/month. MailerLite MailerLite
• Brevo: Also supports subject-line A/B testing, but it starts at $18/month for the Standard plan where A/B testing is included. Brevo Help Brevo Help

My pick

Go with MailerLite if you're starting small or want to keep costs down. It's particularly good if your main requirement is simply: send newsletters + test subject lines + automate basic sequences.

mailerlite.com

If you tell me roughly how many subscribers you have (e.g. 500, 5k, 20k), I can tell you which is cheapest at your actual list size.

If your main requirement is cheap + subject-line A/B testing, I’d usually pick MailerLite first. It gives you the best balance of low cost and testing features. MailerLite MailerLite

Here’s the shortlist:

My recommendation:

• Under ~10,000 subscribers: choose MailerLite. You get subject-line testing, automation, templates, and a simple interface without paying much. MailerLite MailerLite
• Large list but low send frequency: look at Brevo, since its pricing model can work better when you have many contacts but don’t email constantly. Mailercloud
• Already using lots of marketing integrations/ecommerce tools: consider Mailchimp, but I wouldn’t choose it purely for A/B testing because cheaper tools cover that need. Mailchimp

For a typical small newsletter or marketing list, I’d start with MailerLite. MailerLite

If you tell me your subscriber count and whether this is for newsletter, ecommerce, or cold outreach, I can narrow it down further.

If your main requirement is cheap + A/B testing for subject lines, I’d choose MailerLite.

• MailerLite: A/B testing is included even on the free plan, including subject-line testing. The free tier supports up to 250 subscribers and 2,500 emails/month. MailerLite MailerLite
• Paid: MailerLite’s Comfort plan starts at $12/month and adds more automation and features. MailerLite
• Brevo: Also good, but A/B testing starts on the $18/month Standard plan, rather than the $9/month Starter plan. Brevo Help Brevo Help

My pick

MailerLite is the better value if you're primarily sending newsletters/campaigns and want to experiment with subject lines without paying much.

mailerlite.com

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan is cheapest for your specific usage.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

• MailerLite: A/B testing is included even on the free plan, including subject-line testing. The free tier allows up to 250 subscribers and 2,500 emails/month; paid plans start at $12/month. MailerLite MailerLite
• Brevo: Also good, but subject-line A/B testing starts with the Standard plan at $18/month. Its free plan has 300 emails/day but doesn't include A/B testing. Brevo Help Brevo Help

My pick: MailerLite if you're starting small. You can actually run subject-line experiments without paying for a premium tier.

If you tell me roughly how many subscribers you have (e.g. 500, 5k, 20k), I can tell you which is cheapest at your size.

If cheap + subject-line A/B testing is your priority, I’d choose MailerLite.

• MailerLite: A/B testing is included even on the free plan, including subject-line tests. The free tier currently allows up to 250 subscribers and 2,500 emails/month. Paid starts at $12/month. MailerLite MailerLite
• Brevo: Also inexpensive, but A/B testing starts on the Standard plan at $18/month. Its free plan has 300 emails/day, but not the A/B testing you’re looking for. Brevo Help Brevo Help

My pick

MailerLite is the better value if your main requirement is: “I want to test subject lines without paying much.” You can start free and run A/B tests immediately. MailerLite

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which will be cheapest at your actual scale.

If your priority is cheap + subject-line A/B testing, I’d choose MailerLite.

• MailerLite: Free plan includes A/B testing, up to 250 subscribers and 2,500 emails/month. Paid Comfort starts at $12/month and adds more advanced testing features. MailerLite MailerLite
• Brevo: Good alternative, but A/B testing starts on the Standard plan at $18/month. Brevo Help Brevo Help
• Kit: Has a generous free plan, but subject-line A/B testing is more limited on lower tiers; Creator is $33/month at 1,000 subscribers. Kit Kit Help Center

My pick

mailerlite.com — best value if you're primarily sending newsletters/campaigns and want to experiment with subject lines without paying much.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan is cheapest for your specific list size.

If your main requirement is cheap + subject-line A/B testing, I’d usually shortlist these:

My recommendation:

• Under ~5,000 subscribers: choose MailerLite. It gives you subject-line A/B testing without forcing you into an expensive plan, and it has a simple interface. MailerLite MailerLite
• 10,000+ subscribers but only occasional sends: consider Brevo because pricing is more send-volume oriented rather than purely contact-count oriented. DecisionWire
• E-commerce with Shopify/WooCommerce: I’d look harder at Mailchimp or Klaviyo, even if they cost more, because integrations may matter more than the email tool price.

For a purely cost-conscious choice, I’d pick:

#1 MailerLite → cheapest solid A/B testing option
#2 Brevo → cheapest when your list is large
#3 Mailchimp → easiest, but not usually the cheapest long-term

One caveat: subject-line tests are most useful when you have enough sends for the difference to mean something. If your list is only a few hundred people, you can still test, but the winner may be mostly noise. Mailchimp

If you tell me your subscriber count and whether this is for a newsletter, ecommerce, or sales emails, I can narrow it to one choice.

If your main priorities are cheap + A/B testing for subject lines, I’d choose MailerLite.

• MailerLite: A/B testing is included even on the free plan, and it specifically supports testing subject lines. The current free tier includes up to 250 subscribers and 2,500 emails/month; paid plans start at $12/month. MailerLite MailerLite
• Brevo: Also supports subject-line A/B testing, but that feature starts on the Standard plan at $18/month. The cheaper Starter plan starts at $9/month but doesn't include A/B testing. Brevo Help Brevo Help

My pick

🥇 MailerLite — best value if A/B testing is non-negotiable.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan/tool will be cheapest for your specific volume. mailerlite.com

If cheap + subject-line A/B testing is the priority, I’d choose mailerlite.com.

• Best value: MailerLite includes email A/B testing even on its free plan, including subject-line testing. MailerLite MailerLite
• Free tier: up to 250 subscribers and 2,500 emails/month. MailerLite
• Paid: starts at $12/month for Comfort, with more automation and other features. MailerLite
• Brevo is another good budget choice, but its A/B testing starts on the $18/month Standard plan, rather than the free tier. Brevo Help Brevo Help

My pick: MailerLite if you're starting out or have a small list. You get the specific feature you care about without paying for a higher-tier plan.

If you tell me roughly how many subscribers you have and how many emails you send/month, I can tell you which is cheapest at your actual volume.

If your main requirement is cheap + A/B testing for subject lines, I’d shortlist these:

My recommendation by situation:

• Under ~5,000 subscribers and watching costs: choose MailerLite. It’s probably the best fit if your only “must-have” is subject-line A/B testing without paying much. Humblytics
• You run an online store: consider Klaviyo because its testing and ecommerce features are stronger, though it’s usually pricier. Prospeo
• You need complex automations (sales funnels, tagging, sequences): pay more for ActiveCampaign. Prospeo
• You just want simple newsletters: MailerLite over Mailchimp for a tight budget. Humblytics Mailchimp

If you tell me:

1. your subscriber count,
2. whether this is a newsletter, ecommerce, or SaaS/business email, and
3. your monthly budget,

I can narrow it to one choice.

If cheap + A/B testing for subject lines is the priority, I’d choose MailerLite.

• MailerLite Free: $0, up to 250 subscribers / 2,500 emails per month, and A/B testing is included—including subject-line testing. MailerLite MailerLite
• MailerLite Comfort: starts at $12/month and adds more automation, templates, AI tools, etc. MailerLite
• Brevo: also supports subject-line A/B testing, but that feature starts on its $18/month Standard plan; its $9 Starter plan doesn't include A/B testing. Brevo Help Brevo Help

My pick

Start with MailerLite Free. It's unusually good value because you don't have to pay just to test two subject lines against each other. MailerLite

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan will be cheapest for your specific volume.

If your main requirement is “cheap + reliable subject line A/B testing”, I’d shortlist these:

My recommendation:

• Small list / starting out: choose MailerLite. It gives you the A/B testing feature without forcing you into a pricey plan. Humblytics
• Ecommerce store: consider Klaviyo instead, because testing and revenue attribution matter more than just subject-line opens. AI Emaily
• Newsletter creator: choose Kit or MailerLite depending on whether you value creator tools or lower cost. Humblytics
• Avoid paying extra just for A/B testing if you’re only testing subject lines; many platforms include it already. AI Emaily

One thing to keep in mind: subject line tests are most useful when you have enough recipients per variant. If your list is only a few hundred people, differences in open rates can be mostly noise. AI Emaily

If you tell me your subscriber count (e.g., 500, 5k, 50k) and whether this is for a newsletter, ecommerce, or marketing emails, I can narrow it to one choice.

If your priority is cheap + solid subject-line A/B testing, I’d pick MailerLite.

• MailerLite: Free plan includes A/B testing, with up to 2,500 emails/month and 250 subscribers. Its paid Comfort plan starts at $12/month and adds more advanced features. MailerLite MailerLite MailerLite
• Brevo: Also good, but A/B testing is only on the Standard plan, starting at $18/month. It specifically supports testing subject lines and content. Brevo Help Brevo Help

My pick

Go with MailerLite if you're a small business, creator, newsletter, or just getting started. You can actually run subject-line A/B tests without paying, which makes it hard to beat on price. MailerLite

mailerlite.com

If you tell me roughly how many subscribers you have and how many emails you send/month, I can tell you which is cheapest for your specific list size.

If cheap + subject-line A/B testing is the priority, I’d pick MailerLite.

• MailerLite: A/B testing is included even on the free plan, including subject-line testing. Free gives you up to 250 subscribers and 2,500 emails/month; paid starts at $12/month. www.mailerlite.com
• Brevo: Also has a free plan, but A/B testing starts on the $18/month Standard plan, so it’s less attractive if testing is essential and budget is tight. help.brevo.com

My pick: MailerLite. It gives you the feature you specifically care about without forcing you onto a paid tier.

If you tell me roughly how many subscribers you have and how many emails/month you send, I can tell you which is cheapest at your actual volume.

If your priority is cheap + A/B testing for subject lines, I’d choose MailerLite.

• MailerLite: A/B testing is included even on the free plan, including subject-line tests. The free tier currently allows up to 250 subscribers and 2,500 emails/month. Paid plans start at $12/month. MailerLite MailerLite MailerLite
• Brevo: Also supports subject-line A/B testing, but it starts on the Standard plan at $18/month; the free plan doesn't include A/B testing. Brevo Help Brevo Help

My pick

Go with MailerLite if you're building a newsletter or small email list and want to experiment without paying much. You can test subject lines, sender names, content, and sending times, with the winner automatically sent to the rest of the list. MailerLite

mailerlite.com

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which option is cheapest at your actual scale.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

• MailerLite — best value: A/B testing is available even on the free plan, including subject-line tests. The free tier supports up to 250 subscribers and 2,500 emails/month; paid plans start at $12/month. MailerLite MailerLite MailerLite
• Brevo — good if you have a larger list: Free gives you up to 100,000 stored contacts but limits sending to 300 emails/day. Subject-line A/B testing starts on Standard at $18/month. Brevo Help Brevo Help
• Mailchimp — solid, but pricier: Subject-line A/B testing requires the Essentials plan or higher; the free plan doesn't include it. Mailchimp Mailchimp

My pick

MailerLite if you're starting out or have a modest list. You get the key thing you care about—testing multiple subject lines and automatically identifying/sending the winner—without paying for it. MailerLite

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which is cheapest at your actual scale.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

• MailerLite: A/B testing is available even on the free plan, including subject lines. The free tier allows up to 250 subscribers and 2,500 emails/month. Paid Comfort starts at $12/month. MailerLite MailerLite
• Brevo: Also inexpensive, with a free plan and Starter from $9/month, but A/B testing requires the Standard plan, starting at $18/month. Brevo Help Brevo Help

My pick

MailerLite if you're primarily sending newsletters/marketing emails and want to experiment with subject lines without paying much. It specifically supports subject-line A/B tests and can automatically send the winning version to the remainder of your audience. MailerLite MailerLite

mailerlite.com

If you tell me roughly how many subscribers you have and how many emails you send/month, I can tell you which is cheapest for your specific usage.

If cheap + subject-line A/B testing is your priority, I’d pick MailerLite.

My recommendation

MailerLite includes campaign A/B testing on its free plan, and specifically supports testing subject lines. The free tier allows up to 250 subscribers and 2,500 emails/month. MailerLite MailerLite

Its paid Comfort plan starts around $12/month and adds things like more automations, AI writing tools, and a subject-line generator. MailerLite

mailerlite.com

Brevo is also good, particularly if you have a relatively large contact list but don't send huge volumes. However, subject-line/content A/B testing starts with its $18/month Standard plan, rather than the free tier. Brevo Help Brevo Help

help.brevo.com

Bottom line

I'd start with MailerLite. You get the A/B testing you specifically need without paying anything initially, and you can upgrade later if your list grows.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which is cheapest for your actual usage—MailerLite vs Brevo vs ConvertKit/Kit vs Mailchimp.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

• MailerLite: A/B testing is included even on the free plan, including testing subject lines. The free tier supports up to 250 subscribers and 2,500 emails/month. Paid plans start at $12/month. MailerLite MailerLite
• Brevo: Also good, but subject-line A/B testing starts on the $18/month Standard plan; its $9/month Starter plan doesn't include A/B testing. Brevo Help Brevo Help

My pick

mailerlite.com — best value if you're primarily sending newsletters/campaigns and want to experiment with subject lines without paying much.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan/tool is cheapest for your specific volume.

If cheap + subject-line A/B testing is the priority, I’d pick MailerLite.

MailerLite includes email A/B testing—even on its free plan—and specifically supports testing subject lines. MailerLite MailerLite

mailerlite.com

Brevo's A/B testing, including subject-line testing, starts with its $18/month Standard plan. Brevo Help Brevo Help

brevo.com

My recommendation

Start with MailerLite Free. If your list is under 250 people, you can literally get subject-line A/B testing for $0. Once you outgrow it, MailerLite's paid plans start around $12/month. MailerLite

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan will be cheapest for your specific list size.

If your main requirement is cheap + subject line A/B testing, I’d shortlist these:

My picks by situation:

• You have <5,000 subscribers and mostly send newsletters: choose MailerLite. It’s usually the best price/features balance and includes A/B testing features. MailerLite
• You just need basic subject-line experiments and a familiar interface: choose Mailchimp. BrandJet AI
• You’re building funnels, sequences, and automations: choose ActiveCampaign. Prospeo

I’d avoid paying for a more complex platform just for subject lines—most teams only need to test:

• Subject line A vs B
• Preview text
• Send time
• Occasionally sender name

For a lean setup, I’d start with MailerLite, then move to ActiveCampaign only when automation becomes the bottleneck. MailerLite Prospeo

If you tell me your subscriber count and whether this is newsletter, ecommerce, or cold outreach, I can narrow it to one choice.

If cheap + subject-line A/B testing is the priority, I’d pick MailerLite.

MailerLite explicitly includes A/B testing—including subject lines—on its free plan. The free tier allows up to 250 subscribers and 2,500 emails/month. www.mailerlite.com

It can also automatically send the winning subject-line version to the remainder of your list after the test. www.mailerlite.com

One important caveat: if your list is larger than 250 people, MailerLite's Comfort plan starts at $12/month, while Brevo's A/B testing starts on its $18/month Standard plan. www.mailerlite.comhelp.brevo.com

My recommendation:

• ≤250 subscribers: MailerLite Free, easily.
• 250–1,000+: MailerLite Comfort is probably the sweet spot.
• Huge contact list but relatively few emails: consider Brevo, since its pricing is based heavily on email volume rather than stored contacts. www.mailerlite.comhelp.brevo.com

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which will actually be cheapest.

If your main requirement is cheap + A/B testing for subject lines, I’d choose MailerLite.

My pick: MailerLite

• A/B testing is available even on the free plan, including subject-line testing. www.mailerlite.comwww.mailerlite.com
• Free plan currently includes 2,500 emails/month (with a 250-subscriber limit on the current pricing page). www.mailerlite.com
• Paid Comfort starts at $12/month and adds more automation and other features. www.mailerlite.comwww.mailerlite.com
• It's particularly attractive if you're building a newsletter or small-business email list and don't need a full CRM.

MailerLite pricing

When I'd pick something else

One important distinction: Brevo's free tier is generous on contacts, but its A/B testing isn't as attractive if A/B subject-line testing is a must-have at the lowest price. MailerLite explicitly includes A/B testing in its free plan. mrreviewai.com

Bottom line: If you tell me roughly how many subscribers you have (or expect) and how many emails you send per month, I can tell you which is actually cheapest for your specific situation.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

My pick: MailerLite

• Free plan: up to 250 subscribers and 2,500 emails/month
• A/B testing is included even on the free plan, including subject lines. www.mailerlite.com
• You can test subject lines, sender names, content, and sending times. www.mailerlite.com
• Paid Comfort starts at $12/month for up to 500 subscribers, with more automation/features. www.mailerlite.com

Runner-up: Brevo

Brevo is also inexpensive, but its A/B testing starts on the $18/month Standard plan, rather than the free tier. help.brevo.com

Bottom line: If you're primarily sending newsletters/campaigns and want to experiment with subject lines without spending much, go with MailerLite. If you tell me roughly how many subscribers you have and how many emails you send/month, I can tell you which plan will actually be cheapest.

If your main requirement is cheap + A/B testing for subject lines, I’d pick MailerLite.

Why MailerLite: its free plan supports up to 250 subscribers and 2,500 emails/month, and includes campaign A/B testing. Their A/B testing specifically lets you test subject lines, and you can run up to five versions of a single element. www.mailerlite.com

MailerLite pricing

One important caveat: if you expect your list to grow substantially, Brevo can become more economical because its pricing is based primarily on email volume rather than contacts. But its A/B testing is on the Standard plan, currently $18/month. www.brevo.com

Brevo pricing

My pick

• Under 250 subscribers: MailerLite Free
• 250–5,000 subscribers: MailerLite is probably the best cheap/simple choice
• Large list + relatively few emails: Consider Brevo
• You mainly care about newsletters + subject-line testing: MailerLite

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which will actually be cheapest for your situation.

If your priority is cheap + subject-line A/B testing, I’d choose MailerLite.

🥇 My pick: MailerLite

MailerLite pricing

MailerLite's free plan includes email A/B testing, with up to 250 subscribers and 2,500 emails/month. Its A/B testing specifically supports testing subject lines, and you can test up to five versions of an element. www.mailerlite.com

Once you outgrow the free tier, the paid Comfort plan starts at $12/month (for up to 500 subscribers on the current pricing). www.mailerlite.com

Brevo is my second choice. Its free plan is generous on contacts, but A/B testing is on the $18/month Standard plan, so it's less attractive if testing is the main thing you care about. help.brevo.com

Bottom line: If you're starting small and want to experiment with subject lines without paying, go with MailerLite.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which one will be cheapest at your actual scale.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

• Best value: MailerLite — its free plan includes campaign A/B testing, and paid plans start around $12/month. You can specifically A/B test subject lines, with up to 5 versions for a single element. www.mailerlite.com
• If you have a larger contact list: MailerLite is still attractive, but its pricing scales with subscribers. For example, a 2026 comparison puts it around $15/mo at 1,000 contacts and $73/mo at 10,000. www.etropo.com
• Brevo can be cheaper if you send lots of emails to a relatively large contact database because it prices more around email volume than contacts. But I'd pick MailerLite if straightforward email marketing and testing are your main needs. www.mailercloud.com

My pick: MailerLite, especially if you're under ~10k subscribers.

If you tell me roughly how many subscribers you have and how many emails you send per month, I can compare the 3–4 cheapest options and tell you which will actually cost the least.

If your priority is cheap + subject-line A/B testing, I’d pick MailerLite.

• MailerLite: A/B testing is available even on its free plan, including testing subject lines. The current free tier is up to 250 subscribers / 2,500 emails per month; paid plans start around $12/month. www.mailerlite.com
• Brevo: Also good value, especially if you have a large contact list but send relatively few emails. However, subject-line/content A/B testing is on its Standard plan, currently around $18/month before discounts. www.brevo.com
• Mailchimp: I wouldn't choose it if cost is the main concern; you're generally paying more for comparable functionality.

My pick

Small list → MailerLite. You get A/B testing without paying just to unlock it, plus a pretty straightforward editor.

Large list → Brevo. Its pricing is based more on email volume than number of contacts, which can make it substantially cheaper when you have lots of subscribers who don't receive every campaign. www.mailerlite.com

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which one will actually be cheapest for your situation.

If cheap + subject-line A/B testing is the priority, I’d pick MailerLite.

MailerLite is the standout because A/B testing is included even on its free plan, and it specifically supports testing subject lines. Its free tier currently allows 2,500 emails/month; paid plans start around $12/month. www.mailerlite.com

Brevo is worth considering if you expect to need more sophisticated automation, but its A/B testing is on the Standard tier, currently starting at $18/month. help.brevo.com

My recommendation: Start with MailerLite Free. You can test subject lines without paying anything, and upgrade only when your list or automation needs outgrow it.

MailerLite pricing

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which plan/tool will be cheapest for your specific volume.

If cheap + subject-line A/B testing is the priority, I’d choose MailerLite.

My pick: MailerLite

• Free: up to 250 subscribers and 2,500 emails/month
• A/B testing is included even on the free plan, including testing subject lines. www.mailerlite.comwww.mailerlite.com
• Paid plans start around $12/month for 500 subscribers, with more automation and features. www.mailerlite.com
• You can test multiple versions and have MailerLite automatically send the winning version to the remaining audience. www.mailerlite.comwww.mailerlite.com

Runner-up: Brevo — its free plan is generous for contacts, but A/B testing requires the Standard plan, starting around $18/month, so it's less attractive if testing is a must-have on a budget. help.brevo.com

Bottom line: If you're a small list and specifically want to experiment with subject lines without paying much, MailerLite is the better deal.

If you tell me roughly how many subscribers you have and how many emails/month you send, I can tell you which plan will be cheapest.

If your main requirement is cheap + subject-line A/B testing, I’d choose MailerLite.

MailerLite is the standout because A/B testing is included even on its free plan, including subject lines. Its free tier currently allows up to 250 subscribers and 2,500 monthly emails. www.mailerlite.com

Kit is also good if you're primarily running a newsletter: its Creator plan supports two subject-line variants, while testing up to five variants requires Creator Pro. help.kit.com

Brevo is attractive if you have a large contact list because it doesn't charge based on stored contacts, but its A/B testing starts on the Standard plan at $18/month. help.brevo.com

My pick

Start with MailerLite. It's the best fit if you're trying to spend as little as possible while still getting genuine subject-line A/B testing.

MailerLite pricing

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which one will actually be cheapest for your situation.

If cheap + subject-line A/B testing is the priority, I’d pick MailerLite.

MailerLite includes A/B testing even on its free plan, including testing subject lines, and its free tier allows up to 250 subscribers and 2,500 emails/month. www.mailerlite.com

Brevo's A/B testing—including subject lines—is available on Standard, starting at $18/month; its $9 Starter plan doesn't include it. help.brevo.com

So my recommendation: start with MailerLite. You can run subject-line tests for free, then move to its Comfort plan (starting at $12/month) if you outgrow the free tier. www.mailerlite.com

MailerLite pricing

If you tell me roughly how many subscribers you have and how many emails you send/month, I can tell you which tool is cheapest at your actual scale.

If cheap + subject-line A/B testing is the priority, I’d pick Brevo.

My ranking

Why Brevo: its pricing is based largely on emails sent rather than number of contacts, which can be a big advantage if you have a large list but don't email constantly. Its Standard plan includes A/B testing for subject lines and content and starts around $18/month on Brevo's current pricing page. help.brevo.commailchimp.com

Brevo official pricing

Mailchimp is a good alternative if you value ease of use and integrations. It supports subject-line A/B tests and automatically sends the winning version to the remaining audience, but A/B testing is on paid marketing plans, and current Standard pricing starts around $20/month. mailchimp.com

Mailchimp official pricing

Bottom line:

• Small/medium list + want to spend as little as possible → Brevo
• Want the easiest, most established interface → Mailchimp
• Newsletter/creator business → consider Kit

If you tell me roughly how many subscribers you have and how many emails you send per month, I can tell you which one will actually be cheapest for your situation.