Which is cheaper: Customer.io or MailerSend?

Customer.io starts at $100/mo, while MailerSend starts at usage-based/custom pricing. Both pricing models are tracked daily on TrackRival.

Does Customer.io or MailerSend have a free tier?

MailerSend offers a free plan in the latest snapshot, whereas Customer.io only offers paid or trial tiers starting at $100/mo.

Which is better: Customer.io vs MailerSend?

Choosing between Customer.io and MailerSend depends on your team's architecture and workload. Customer.io excels for teams needing streamlined workflows, while MailerSend offers specialized depth in email. Review the side-by-side feature matrix and recent release cadence above to make an informed choice.

How do Customer.io and MailerSend compare for developer and enterprise features?

Customer.io and MailerSend handle enterprise scale differently: compare whether each provider includes SAML SSO, role-based access control (RBAC), SOC 2 compliance, and dedicated support SLAs in their standard tiers or reserves them for custom enterprise quotes.

Do Customer.io and MailerSend support AI agent or MCP integrations?

Both tools support modern API integrations and webhooks. Furthermore, TrackRival provides official Model Context Protocol (MCP) telemetry for Customer.io and MailerSend, allowing AI coding assistants like Claude Desktop and Cursor to query their live pricing and changelogs directly.

How often is this Customer.io vs MailerSend comparison updated?

TrackRival refreshes pricing telemetry daily from verified official sources and appends changelog entries as soon as either Customer.io or MailerSend publishes an update.

Customer.io vs MailerSend

Research & Verification: TrackRival Research Team·Category: email·Updated: Oct 20, 2026

A comprehensive side-by-side comparison of pricing, tier limits, and recent changelog releases for Customer.io and MailerSend.

Quick Verdict: Customer.io vs MailerSend in 2026

MailerSend provides a zero-cost free tier ($0/mo), while Customer.io entry plans start at $100/mo. Choose Customer.io if you need messaging automation for lifecycle and product email, or choose MailerSend for transactional email for product and engineering teams.

Customer.io

Messaging automation for lifecycle and product email.

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Category: email
Plans tracked: 3
Entry price: $100/mo
Free plan?: No

See full Customer.io pricing & changelog →

MailerSend

Transactional email for product and engineering teams.

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Category: email
Plans tracked: 4
Entry price: Free tier
Free plan?: Yes

See full MailerSend pricing & changelog →

How do Customer.io and MailerSend pricing plans compare in 2026?

Verified Source Data: Pricing tiers and features are synchronized directly from official vendor endpoints (Customer.io Pricing and MailerSend Pricing) and diff-checked daily by TrackRival telemetry.

Customer.io

Essentials

Customer.io

$100/mo

5k profiles (people + objects)
AI Agent with core execution skills
1 million emails per month
2 object types
Visual workflow builder
+ 1 more

Premium

Customer.io

$1000/mo

Everything in Essentials, plus:
Custom profile volume & pricing
10 object types
Elevated Agent limits + custom skills
Daily Routines (scheduled tasks)
+ 1 more

Enterprise

Customer.io

Custom

Everything in Premium, plus:
Our best pricing on profile & email volume
Priority technical support
Migration support
Dedicated Customer Success Manager
+ 1 more

MailerSend

Free

MailerSend

Free

500 emails /month
Email API and SMTP relay
Email threads support
Drag & Drop email builder
1 user seat + 1 accountant role
+ 1 more

Hobby

MailerSend

5,000 emails /month
User roles & permissions
Bulk emailing
5 seats, 1 domain, 10 templates
1-day activity data retention
+ 1 more

Professional

MailerSend

50,000 emails /month
150 SMS /month
7-days API logs retention
Dedicated Account manager & Deliverability consultation
∞ users, ∞ domains, ∞ templates
+ 1 more

Starter

MailerSend

50,000 emails /month
100 SMS /month
Sender identities
Remove MailerSend logo
SMS API (USA and Canada)
+ 1 more