Customer.io vs MailerLite
Side-by-side plans, pricing, and feature gates for Customer.io and MailerLite, verified . Customer.io is primarily marketing automation; MailerLite is primarily email marketing.
Plans side by side
Every published plan from each vendor, with the headline monthly anchor price. Some prices scale with subscriber count or seats; full detail lives on each tool's page.
Customer.io
- Essentials
Entry tier with the visual workflow builder
$100/mo - Premium
Custom volume, HIPAA available, daily routines
$1,000/mo - Enterprise
Best volume pricing with dedicated infrastructure
Custom
MailerLite
- Free
Up to 500 subscribers, 12,000 sends/month
Free - Growing Business
Most popular paid tier, starts at 500 subscribers
$10/mo - Advanced
Power features for active senders
$20/mo - Enterprise
100,000+ subscribers, custom contracting
Custom
Limits at the entry paid tier
Compares Essentials (Customer.io) against Growing Business (MailerLite). Both are the lowest-priced non-free, non-custom plan on each side.
| Limit | Customer.io | MailerLite |
|---|---|---|
| Contacts | 5,000 profiles (people plus objects) | 500 subscribers (anchor; scales up) |
| Emails / month | 1,000,000 | Unlimited |
| Team seats | 1 | 3 |
When Customer.io wins
- B2C and B2B teams with custom objects in their data model (accounts, subscriptions, devices) who need messaging tied to those entities
- Product-led businesses sending behavior-triggered lifecycle messaging across email, SMS, and push
- Teams needing HIPAA compliance for healthcare or digital-health workflows
Where Customer.io is the wrong fit
- Solo creators and newsletter operators (Kit or beehiiv are the right shape)
- Small businesses that need a $0/month or $20/month entry point (MailerLite or Mailchimp Free fit better)
- Teams that want a one-click WYSIWYG email tool with no data modeling required
When MailerLite wins
- Solo creators and small businesses replacing Mailchimp
- Teams that want one tool for emails, landing pages, and a small website
- Nonprofits (30% discount on paid plans)
Where MailerLite is the wrong fit
- B2B teams needing deep CRM and pipeline workflows (use HubSpot or ActiveCampaign)
- Operators wanting native ad network or paid subscriptions (use beehiiv)
- API-first transactional senders (use Postmark or Resend)
Common questions
- Is Customer.io cheaper than MailerLite?
- At the entry tier, MailerLite starts at Free versus Customer.io at $100/mo. MailerLite is cheaper at the entry. Pricing scales differently above that, so check the full plan grid.
- Does Customer.io or MailerLite have a free plan?
- Only MailerLite has a permanent free plan. Customer.io only offers a free trial.
- Are Customer.io and MailerLite in the same category?
- No. Customer.io is primarily a marketing automation tool; MailerLite is primarily a email marketing tool. They overlap on use case but sit in different primary categories, so the comparison is between adjacent tools rather than direct competitors.
- Which has more plans, Customer.io or MailerLite?
- MailerLite ships 4 plans; Customer.io ships 3. MailerLite's longer ladder gives more granular upgrade steps, which can mean smoother price escalation as your team scales.
- Where can I see alternatives to Customer.io or MailerLite?
- Each tool has a dedicated alternatives page on TierGauge with ranked options and verified pricing: /alternatives/customer-io for Customer.io and /alternatives/mailerlite for MailerLite. Alternatives are derived from each tool's editor-flagged competitors plus same-category tools we track.
Customer.io: https://customer.io/pricing/ · MailerLite: https://www.mailerlite.com/pricing
Last verified . Pricing changes between refreshes; confirm at the vendor before purchasing.