Customer.io vs MailerLite Comparison
Compare Customer.io vs MailerLite features, pricing, and more.
Last updated: November 2026
Customer.io
6.5/10
Customer.io is a behavior-driven messaging platform that lets product-led and tech companies automate email, push, in-app, SMS and WhatsApp messages based on user data.
MailerLite
7.1/10
MailerLite is an email marketing platform for small businesses and creators, combining newsletters, automations, landing pages, sites, forms and digital product sales.
Feature-by-Feature Comparison
| Feature | | |
|---|---|---|
| Scores | ||
| Overall Rating | 6.5/10 | 7.1/10 |
| Scalability | 8/10 | 6/10 |
| Ease of Use | 5/10 | 9/10 |
| Customization | 9/10 | 7/10 |
| Security | 8/10 | 6/10 |
| Support | 5/10 | 5/10 |
| Cost | 4/10 | 8/10 |
| Integration | 8/10 | 7/10 |
| Analytics | 5/10 | 6/10 |
| Pricing | ||
| Free plan | No | Yes |
| Cheapest paid plan | $100/mo Essentials | $12/mo Comfort |
| Estimated cost for 10 users | $100/mo Essentials | $25/mo Power |
| Features | ||
| Landing Pages | ||
| SMS Marketing | Not listed | |
| Email Marketing | ||
| Segmentation | ||
| A/B Testing | ||
| E-commerce Features | Not listed | |
Which One Should You Choose?
Why choose Customer.io
- Higher Scalability score (8/10 vs 6/10)
- Higher Customization score (9/10 vs 7/10)
- Better fit for mid-market (8/10 vs 5/10)
- Better fit for enterprise (6/10 vs 4/10)
Why choose MailerLite
- Has a free plan (Customer.io does not)
- Lower estimated cost for 10 users: $25/mo vs $100/mo
- Higher Ease of Use score (9/10 vs 5/10)
- Higher Cost score (8/10 vs 4/10)
- Better fit for freelancers (8/10 vs 2/10)
Pros & Cons
Customer.io
Pros
- Its visual workflow builder supports branching, goals and loops, and it can coordinate email, push, in-app, SMS and WhatsApp in one flow.
- Segmentation can use custom events, attributes and inactivity windows, and a built-in CDP stores custom objects.
- Every plan includes API and webhook access, and reviewers say developers can connect it easily.
- It holds SOC 2 Type II and ISO 27001 certifications, supports HIPAA, offers SSO, and lets you choose US or EU data residency.
- Startups that have raised under $10M can get up to 12 months free.
Cons
- Every stored profile counts toward the bill, inactive ones included, so costs climb quickly as the contact list grows.
- Setup has a steep learning curve and usually needs a developer to implement event tracking.
- There are no native landing pages or signup forms.
- Reviewers say reporting is limited and often needs data exports.
- Chat support starts at Premium, and Essentials gets only email and community support.
MailerLite
Pros
- The interface is clean, and reviewers say automations are quick to set up even for first-time users.
- Automations are included even on the free plan.
- Paid plans start at $12 a month, which reviewers say is cheaper than Mailchimp or Constant Contact.
- Native e-commerce integrations with Shopify, WooCommerce and Stripe feed purchase-based automations.
- Reviewers report deliverability ranking first in an independent EmailToolTester test.
Cons
- Many users report accounts suspended or terminated with little warning and difficult appeals.
- Support is email-only on Comfort, and some reviewers say replies are slow.
- The free plan has been cut more than once and now allows only 250 subscribers.
- Prices rise steeply as the list grows, according to a competitor's analysis.
- Reviewers find reporting and segmentation limited for larger companies.
