Customer.io vs MailerLite
Customer.io and MailerLite are both popular choices in the email marketing platform space. MailerLite is the more affordable option at $10/mo — that's $90 less per month than Customer.io's $100/mo entry point. MailerLite offers a free plan (1,000 subscribers), while Customer.io does not. Customer.io stands out with SMS marketing, while MailerLite offers landing pages and ecommerce integrations.
Quick Verdict
Customer.io wins on integrations.
MailerLite wins on price, deliverability, rating, free tier.
Best for most users: MailerLite (small businesses).
Customer.io
Behavioral messaging platform for product-led SaaS and tech companies
Customer.io is a behavioral messaging platform built for product-led SaaS companies that need to trigger automated emails, SMS, push notifications, and in-app messages based on real-time user events. Its visual workflow builder and Liquid templating provide deep personalization, while the built-in Data Pipelines act as a lightweight CDP. Trusted by 8,000+ companies including Notion and Segment, it starts at $100/month for 5,000 profiles.
MailerLite
Email marketing tools for growing businesses
MailerLite is known for its simplicity, affordability, and clean design. It's one of the best options for small businesses and beginners who want professional email marketing without complexity. The built-in website builder and digital product sales features add extra value.
Feature Comparison
| Feature | Customer.io | MailerLite |
|---|---|---|
| Rating | 4.4/5 | 4.6/5 |
| Starting Price | $100/mo | $10/mo |
| Free Plan | No free plan | 1,000 subscribers |
| Founded | 2012 | 2010 |
| Email Templates | 30 | 90 |
| Integrations | 150 | 140 |
| Deliverability Rate | 96% | 97% |
| Marketing Automation | ✓ | ✓ |
| A/B Testing | ✓ | ✓ |
| Landing Pages | ✕ | ✓ |
| Segmentation | ✓ | ✓ |
| Drag & Drop Editor | ✓ | ✓ |
| SMS Marketing | ✓ | ✕ |
| Ecommerce Features | ✕ | ✓ |
| API Access | ✓ | ✓ |
| Multi-Language | ✓ | ✕ |
| Web Push Notifications | ✓ | ✕ |
| Live Chat | ✕ | ✓ |
| Advanced Analytics | ✓ | ✓ |
Customer.io: Pros & Cons
Pros
- +Powerful visual workflow builder with real-time event-based triggers for behavioral automation
- +Omnichannel messaging across email, SMS, push notifications, in-app, and webhooks in one platform
- +Built-in Data Pipelines that serve as a lightweight CDP, unifying web, mobile, and backend data
- +Segment builder is intuitive enough for marketers without requiring dedicated engineering support
- +Startup Program offers up to 12 months free for qualifying early-stage companies
Cons
- −Essentials plan starts at $100/month for only 5,000 profiles — expensive for small teams
- −Steep learning curve for non-technical users, especially with Liquid templating syntax
- −Pricing scales aggressively past 10K profiles with significant jumps between plan tiers
- −Template editor feels restrictive for highly custom-coded email layouts
- −Searching for past messages and editing templates can be unintuitive and slow
MailerLite: Pros & Cons
Pros
- +Excellent value for money — most affordable paid plans
- +Clean, intuitive interface perfect for beginners
- +Built-in website and landing page builder
- +Sell digital products directly
- +Strong drag-and-drop email editor
Cons
- −Free plan limited to 1,000 subscribers
- −No SMS marketing
- −Fewer integrations than competitors
- −Strict approval process for new accounts
- −Limited automation compared to ActiveCampaign
The Verdict
Customer.io and MailerLite are closely matched — both score within 0.2 points of each other in our overall rating. Your decision should come down to specific needs rather than overall quality. On deliverability, MailerLite reports 97% compared to 96% for Customer.io — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | Customer.io | MailerLite |
|---|---|---|---|
| Starting Price | 30% | $100/mo | $10/mo |
| Deliverability | 25% | 96% | 97% |
| Rating | 25% | 4.4/5 | 4.6/5 |
| Integrations | 10% | 150 | 140 |
| Free Tier | 10% | No | Yes |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose Customer.io if…
- + You need SMS marketing
- + You're a product led saas companies with event driven messaging needs
- + You're a technical marketing teams that want advanced automation with liquid logic
Choose MailerLite if…
- + You want lower starting costs ($10/mo)
- + You need a free plan to get started
- + You need ecommerce integrations
- + You need built-in landing pages