The best email marketing tool for UK small businesses in 2026: an honest comparison

If you're a UK small business owner who wants the cheapest path to sending emails: use MailerLite. Free up to 500 subscribers, easy to use, cheap to upgrade. If you'd rather start with something more powerful that you won't outgrow — there's a better answer at the end.

I set up email marketing for clients every month — salons in Twickenham, restaurants in Richmond, B2B service businesses across London. People always ask the same thing: "There are dozens of tools, which one should I pick?"

The honest answer is that 80% of small businesses are choosing between the same four: MailerLite, Klaviyo, Brevo, and Mailchimp. The other tools are either too niche, too expensive, or built for a different kind of business. So this guide focuses on those four, and gives you a clear "if X, pick Y" recommendation at the end.

One thing has changed dramatically in the last year and it affects the recommendation: Mailchimp gutted its free plan in January 2026. Down from 500 to 250 contacts, and they removed automation from free accounts entirely. If your decision was "I'll start with Mailchimp because it's free" — that's no longer the move it once was. More on that below.

The four tools we're comparing

Before the head-to-heads, here's the one-line summary of each:

• MailerLite — simple, affordable, made for small businesses. Free up to 500 subscribers, paid plans from $10/month.
• Klaviyo — built for e-commerce, deep Shopify integration, expensive but powerful. Free up to 250 contacts, paid from $20/month.
• Brevo (formerly Sendinblue) — French company, unusual pricing model based on email volume not contact count. Free with a 300/day send cap, paid from $9/month.
• Mailchimp — the big name, used to be the default, recently made some unpopular changes. Free up to just 250 contacts with no automation, paid from $13/month.

The pricing reality (2026)

Here's what each one actually costs as of May 2026. Prices shown in USD because that's how all four bill — convert to £ at roughly 0.80x at current rates.

Free plans:

• MailerLite: 500 subscribers, 12,000 emails/month, automation included. (Reduced from 1,000 in September 2025.)
• Klaviyo: 250 profiles, only 500 emails/month total. Very restrictive.
• Brevo: Up to 100,000 contacts stored, but only 300 emails/day sending cap.
• Mailchimp: 250 contacts, 500 emails/month, no automation, no scheduling, no A/B testing.

Cheapest paid plans (for ~500 subscribers):

• MailerLite Growing Business: $10/month, unlimited emails, full automation.
• Brevo Starter: $9/month, 5,000 emails/month, unlimited contacts.
• Mailchimp Essentials: $13/month, 5,000 emails/month, but no multi-step automation (Standard plan at $20/month for that).
• Klaviyo Email: $20/month, unlimited emails.

MailerLite vs Klaviyo: which one wins?

This is the comparison I see most. The short answer is straightforward: they're built for different businesses, so the question is really about whether you run an e-commerce store or not.

Pick MailerLite if: you run a local service business (salon, clinic, restaurant, trade), a course or info-product business, a newsletter, or a small B2B. You want to send campaigns and welcome sequences without learning a complex platform. Cost matters.

Pick Klaviyo if: you run a Shopify, WooCommerce, or BigCommerce store doing real sales volume. You need advanced segmentation by purchase behaviour, abandoned cart flows, post-purchase sequences, predictive analytics. You can afford $30–$150+ per month as your list grows.

The honest reality: Klaviyo is overkill for most UK small businesses, and the cost ramps fast. At 1,000 contacts you're paying $30/month; at 10,000 you're paying $150/month — and that's before you add SMS or any of the other add-ons they upsell. MailerLite at the same list sizes is roughly half that.

But if you do run an e-commerce store, Klaviyo's Shopify integration is genuinely best in class. It's the tool serious DTC brands use for a reason.

MailerLite vs Brevo: which one wins?

This comes down to how you pay. The two platforms use completely different pricing models, and depending on your situation, one will be significantly cheaper than the other.

MailerLite charges by subscribers. The more people on your list, the more you pay — regardless of whether you email them or not.

Brevo charges by emails sent. You can store 100,000 contacts for free; you only pay when you send.

This matters more than it sounds. Here are two real-world examples:

• You're a yoga studio with 800 members on your list and you send one monthly newsletter. MailerLite charges you for 800 subscribers (about $15/month). Brevo charges you for 800 emails/month — well within the free tier. Brevo wins.
• You're a small business with 400 subscribers and you send 3 emails a week. That's roughly 4,800 emails/month — over Brevo's free cap. You'd need Brevo's $9 Starter plan. MailerLite covers you free up to 500 subscribers. MailerLite wins.

So: large list, infrequent sender → Brevo. Smaller list, frequent sender → MailerLite.

One more thing in Brevo's favour: it's a French company with EU servers and is genuinely GDPR-friendly out of the box. MailerLite is also GDPR-compliant (they have an EU entity in Lithuania) but Brevo's data residency is more clearly EU.

MailerLite vs Mailchimp: which one wins?

A year ago this was a closer fight. In 2026, it isn't. MailerLite wins on almost every dimension that matters to a small business.

Here's the brutal short version:

By comparison, MailerLite's free plan includes 500 subscribers, 12,000 emails per month, and full automation. The paid Growing Business plan starts at $10/month and includes automation, unlimited emails, and 24/7 support.

Mailchimp also famously counts unsubscribed contacts towards your billing limit unless you manually archive them — a quiet way of inflating your bill that catches a lot of people out. MailerLite doesn't do this.

The honest case for staying on Mailchimp is migration cost. If you've got years of email history, integrations set up, templates designed, audience segments built — switching takes a day or two of work. That's the only real reason to stay.

Brevo vs Mailchimp: which one wins?

Brevo wins on price and features. Mailchimp wins on brand recognition and integration count.

For a typical UK small business deciding between these two: Brevo's free plan lets you store 100,000 contacts. Mailchimp's free plan limits you to 250. Brevo's $9 Starter plan covers 5,000 emails/month. Mailchimp's $13 Essentials covers 5,000 emails/month — but doesn't include automation. To get the same automation features in Mailchimp that Brevo gives you free, you need the $20/month Standard plan.

That's not a small difference. Over a year, choosing Brevo over Mailchimp Standard saves you around £100, and you get more flexibility on contact count.

The case for Mailchimp over Brevo: if you use specific third-party tools that only integrate with Mailchimp (a few SaaS products still do), or if your team already knows the Mailchimp interface. Otherwise, Brevo is the better-value pick.

Feature comparison at a glance

Here's the side-by-side, focused on what actually matters to a small business owner picking a tool:

Which one fits your UK business?

Quick reference by the kinds of businesses we typically work with:

Salons, clinics, beauty, fitness studios

Pick MailerLite. You don't need anything fancy. You need to send promos, appointment reminders, and a monthly update. MailerLite does this beautifully and stays cheap as your list grows. Use the free plan until you hit 500 subscribers, then upgrade for $10/month.

Restaurants, cafés, food businesses

Pick MailerLite or Brevo. MailerLite if you email regularly (weekly specials, events). Brevo if you have a large list but only email for special occasions (Christmas, new menu launches).

Tradespeople (plumbers, electricians, builders)

Pick MailerLite. Honestly, most tradespeople don't need email marketing — they need a good website, Google reviews, and a Google Business Profile. But if you do want to send the occasional update or maintenance reminder, MailerLite's free tier covers it without any hassle.

E-commerce stores (Shopify, WooCommerce)

Pick Klaviyo. This is where Klaviyo earns its premium price. The Shopify integration gives you abandoned cart flows, post-purchase sequences, segmentation by lifetime value, and predictive analytics. None of the others come close for true online retail. Start free, upgrade when you cross 250 contacts.

B2B service businesses and consultancies

Pick MailerLite if budget is tight. Pick Encharge if it's not. MailerLite handles newsletters and basic nurture sequences fine. But if you want behavioural triggers (emails based on what pages someone visits, lead scoring, sales pipeline sync), Encharge is genuinely the better tool — see below.

Course creators, coaches, info-product businesses

Pick MailerLite. Best balance of affordable and capable. Built-in landing pages and digital product sales (on paid plans) cover most of what course creators need without a separate Kajabi or Teachable subscription.

If you want to start properly, not just cheaply: Encharge

Everything above assumes you want the cheapest path that works. If you'd rather start with something more powerful and easier to use from day one, the answer changes.

For our clients — and honestly for ourselves — we use Encharge.

Encharge does everything MailerLite does (campaigns, newsletters, sign-up forms, automations) but with much more powerful behavioural triggers underneath. You can send emails based on what someone does on your website, score leads, build proper lifecycle flows, and sync with a sales pipeline. The kind of stuff you'd otherwise need ActiveCampaign or HubSpot for.

The interface is also genuinely easier than MailerLite once you're past the first hour. Less clutter, better visual flow builder, more sensible defaults. So why isn't it the headline recommendation? One reason only: there's no free plan. If you want to test the waters with zero budget, MailerLite is the right call. If you've already decided email is important and you'd rather start with a tool you won't outgrow, Encharge is the better choice.

What we offer M4TRIX DEV clients: you can set Encharge up yourself, or we can do it for you. Either way, we have special partner pricing that's hard to beat — we don't advertise the rate publicly, so get in touch and we'll send you the numbers if it sounds like a fit.

Our top pick for DIY: MailerLite

If you've read this far and you're still deciding, here's the simple recommendation: start with MailerLite.

It's free up to 500 subscribers (more than enough to start), the paid plan is the cheapest serious option at $10/month, the interface is the friendliest of the four, and the free plan includes proper automation — which is increasingly rare.

The only reasons not to start with MailerLite:

• You run a Shopify or WooCommerce store doing real revenue → Klaviyo.
• You have a huge contact list you barely email → Brevo.
• You're already on Mailchimp and your setup is too valuable to migrate → Mailchimp.
• You want something more powerful that you won't outgrow → Encharge (see above).

Otherwise: start a free MailerLite account and you'll be sending your first campaign within an hour.