MailerLite is the best default pick for most small businesses — its free plan covers 1,000 subscribers and full automation at no cost, and its paid pricing stays competitive as your list grows. For e-commerce stores on Shopify or WooCommerce, Klaviyo is the clear alternative; for deep sales-funnel automation with a CRM, ActiveCampaign. The trap most reviews miss: Mailchimp's pricing jumps sharply past 1,500 contacts, and Brevo's free tier caps at 300 emails per day — both limits arrive faster than most small teams expect.
Quick Picks by Use Case
| Situation | Best tool |
|---|---|
| Starting out, need a free plan with automation | MailerLite |
| E-commerce store (Shopify / WooCommerce / BigCommerce) | Klaviyo |
| Sales funnel with branching logic and a built-in CRM | ActiveCampaign |
| Mixing transactional, marketing, and SMS in one platform | Brevo |
| Beginners who want templates and broad app integrations | Mailchimp |
Full Comparison
| Tool | Free plan | Key free-tier limit | Pricing model |
|---|---|---|---|
| Mailchimp | Yes — 500 contacts | Automation gets clunky at 3–4 steps; pricing jumps past 1,500 contacts | By contact count |
| ActiveCampaign | No — 14-day trial only | No free option at all | By contact count |
| MailerLite | Yes — 1,000 subscribers, 12,000 emails/mo | Fewer native integrations | By subscriber count |
| Brevo | Yes — 300 emails/day | Daily send cap makes list broadcasts impractical | By sends, not contacts |
| Klaviyo | Yes — 250 contacts | Priced by contacts; scales quickly on mid-size lists | By contact count |
Mailchimp
Best for: Absolute beginners who want templates and broad integrations
Mailchimp's onboarding is fast — importing a list, picking a template, and setting up a welcome sequence takes under an hour. The drag-and-drop builder is genuinely intuitive, and the free plan (500 contacts) delivers real results before you spend anything.
Pros:
- Thousands of templates; direct integrations with Shopify, Squarespace, WooCommerce
- Solid reporting with click maps and audience segmentation
- Free plan sufficient for early-stage businesses
Cons:
- Automation logic gets clunky beyond 3–4 steps — branching and conditional paths are awkward
- Pricing jumps sharply past 1,500 contacts; plan for this before you hit the threshold
- Customer support on lower tiers is self-serve documentation only
Skip it if you need conditional automation logic or a built-in CRM. You'll hit those walls within months and face a painful platform migration.
ActiveCampaign
Best for: Small businesses running real sales funnels
ActiveCampaign's visual automation builder lets you map subscriber journeys with conditions, splits, wait steps, and goal-tracking nodes. No platform at this price point comes close to that flexibility. The built-in CRM syncs deal pipelines directly to email behavior — useful for service businesses managing leads alongside campaigns.
Pros:
- Most capable visual automation builder in this price range
- Built-in CRM with deal pipelines tied to email behavior
- Strong deliverability and email reputation management tools
Cons:
- Steeper learning curve than every other platform on this list
- No free plan — 14-day trial only
- Reporting interface feels dated compared to newer platforms
Skip it if you only need a monthly newsletter or a simple welcome sequence. You'll pay for automation depth you never use.
MailerLite
Best for: Budget-conscious teams with lists up to several thousand subscribers
MailerLite's free plan — 1,000 subscribers, 12,000 emails per month, automations included — is enough to run a real campaign. The interface is cleaner than Mailchimp's, the automation builder is more capable than its price suggests, and paid tiers stay competitive as your list scales.
Pros:
- Generous free plan with automation, not just basic broadcasts
- Clean, fast interface with minimal learning curve
- Competitive pricing as your list grows beyond the free threshold
Cons:
- Fewer native integrations than Mailchimp or ActiveCampaign
- Landing page builder is functional but not a differentiator
- Support response times slow on the free tier
Skip it if you need deep CRM functionality or advanced e-commerce purchase-behavior tracking.
Brevo (formerly Sendinblue)
Best for: Service businesses mixing transactional email, marketing, and SMS
Brevo is the only platform here that bundles transactional email, marketing email, and SMS campaigns without requiring separate tools or third-party bridges. For businesses sending appointment reminders, invoices, and newsletters from one account, that consolidation saves real money. Its contact-agnostic pricing on some plans also means a large list you email infrequently won't inflate your bill.
Pros:
- Free plan: 300 emails/day with no contact count cap
- SMS and WhatsApp marketing native — no third-party bridge required
- Solid transactional email API for developer integrations
Cons:
- 300-email daily cap makes list broadcasts impractical without upgrading
- Automation builder is capable but less visual than ActiveCampaign
- Deliverability varies on new domains; a warm-up period is required for large sends
Skip it if your business is primarily e-commerce. Klaviyo's revenue attribution and purchase-behavior segmentation will deliver more value.
Klaviyo
Best for: Online stores on Shopify, WooCommerce, or BigCommerce
Klaviyo pulls purchase history, browsing behavior, and cart data from your store, then lets you build automations — abandoned cart sequences, post-purchase flows, win-back campaigns — with per-flow revenue attribution that shows exactly what each automation earns. No other platform on this list connects email performance to actual store revenue as directly.
Pros:
- Deep native integration with Shopify, WooCommerce, BigCommerce
- Revenue attribution per flow and per campaign
- Powerful segmentation based on purchase behavior, not just email opens
Cons:
- Pricing scales with contact count and climbs quickly on mid-size lists
- Overkill for service businesses or anyone without a product catalog
- Interface complexity grows with list and flow count
Skip it if you don't have a product catalog. Service businesses, agencies, and newsletter operators will use under 20% of what Klaviyo offers and overpay for the rest.
How to Choose: A 3-Step Decision
Step 1 — Identify your primary email type.
- Marketing newsletters only → MailerLite or Mailchimp
- Sales funnel with conditional logic → ActiveCampaign
- E-commerce store flows → Klaviyo
- Transactional + marketing + SMS together → Brevo
Step 2 — Estimate your list size in 12 months, not today. Pricing models differ enough to change your decision:
- Brevo charges by sends, not contacts — better if you have a large list you email infrequently
- Klaviyo and Mailchimp charge by contact count — can get expensive on fast-growing lists
- MailerLite and ActiveCampaign offer predictable per-tier pricing with clear upgrade thresholds
Step 3 — Match automation complexity to your actual workflow.
- Welcome sequences and one-off broadcasts: any platform on this list
- Conditional branching, wait steps, goal-tracking nodes: ActiveCampaign only
- Purchase-triggered flows with revenue attribution: Klaviyo only
Common mistakes:
- Building complex automations inside Mailchimp's free tier — those features are restricted; you'll migrate later at a significant time cost
- Choosing Klaviyo for a service business — the e-commerce data layer it depends on doesn't exist for you
- Not running a 12-month pricing projection before committing — the platform that's cheapest at 500 contacts is often not cheapest at 5,000
FAQ
What is the best free email automation tool for small businesses? MailerLite — 1,000 subscribers and automation both included at no cost. Mailchimp's free tier is also viable but restricts automation features more heavily, and caps at 500 contacts.
Do I need a paid plan to run automations? Not always. MailerLite, Mailchimp, and Brevo include basic automations (welcome sequences, autoresponders) on free plans. ActiveCampaign and Klaviyo require a paid plan for any automation access.
How important is deliverability for small businesses? Critical. An email landing in spam is worth nothing regardless of which platform sent it. All five platforms have solid deliverability track records, but warming up a new sending domain matters with any of them — ramp up send volume gradually before blasting your full list.
Can I switch platforms later without losing my data? Your contact list exports as a CSV from any platform here. What cannot be exported is your automation logic — every flow, condition, and sequence needs to be rebuilt manually in the new tool. This is the real cost of switching after you've built complex workflows, and the main reason to choose carefully upfront.