Customer.io vs Mailgun

Two transactional email providers, compared on price, features and ratings, so you can pick fast.

Customer.io wins editor tools and supportMailgun wins price and developer experience

Updated August 2026

At a glanceCustomer.ioMailgun
Cost per 1k @ 100k—$0.9
G2 rating4.44.5
Trustpilot3.24.3
Drag-and-drop editorYesNo

THE VERDICT

Customer.io wins on editor tools and support. Mailgun wins on price and developer experience.

Customer.io and Mailgun take different pricing approaches. Mailgun rates higher with developers (4.5 vs 4.4 on G2). Pick based on volume and team, and the scorecard below breaks down where each one leads.

Which should you choose?

Pick Customer.io

✓You need behavior-triggered lifecycle messaging across email, push, and SMS
✓You want journeys driven by real-time user/event data and a unified profile
✓You're consolidating marketing automation and transactional messaging
✓You need EU data residency or HIPAA-grade compliance

Pick Mailgun

✓You want a developer-first email API with strong deliverability tooling
✓You send high-volume transactional email and want usage-based pricing
✓You need EU data residency, log retention, and email validation add-ons
✓You are in the Sinch ecosystem or want enterprise deliverability consulting
Set up Mailgun with Courier →

Feature by feature

Winner cells are tinted, green where Customer.io leads, violet where Mailgun does.

capability
Customer.io
Mailgun
Starting paid plan
$100/mo
$15/mo
Cost per 1k @ 100k
—
$0.9
Pricing model
Subscription
Hybrid
Overage
Profile-based pricing: additional profiles $0.009 each; additional emails $0.12 per 1,000 over the plan's bundled allowance; AI credits $10/100K. Email volume does not map to a per-email tier.
from $1.10 / 1,000 emails
Dedicated IP
Plan-gated
Plan-gated
Deliverability tooling
Yes
Yes
Automated IP warmup
Yes
Yes
Suppression management
Yes
Yes
SPF / DKIM / DMARC
Yes
Yes
Transactional API
Yes
Yes
Marketing campaigns
Yes
—
SMTP relay
Yes
Yes
Inbound routing
No
Yes
Dynamic templates
Yes
Yes
Batch send
Yes
Yes
Scheduled send
Yes
Yes
Official SDKs
Ruby, Python, Node.js, Go, PHP, JavaScript (Web), iOS, Android, React Native, Flutter, Expo
Python, Ruby, PHP, Java, Node.js, Go
Event webhooks
Yes
Yes
Drag-and-drop editor
Yes
Yes
Custom HTML editor
Yes
Yes
Email validation
No
Add-on
Log retention
—
1-30 days
Sandbox / test mode
—
Yes
Open / click tracking
Yes
Yes
Analytics dashboard
Yes
Yes
A/B testing
Yes
Yes
EU data residency
Yes
Yes
SOC 2
Yes
Yes
HIPAA
BAA
BAA
GDPR
Yes
Yes
ISO 27001
Yes
Yes
Support channels
Community + email (Essentials); chat (Standard); dedicated CSM + technical specialist (Premium/Enterprise)
Email/ticket, Chat, Phone
Support SLA
Plan-gated
Plan-gated
Migration assistance
Yes
—

FAQ

Common questions

Mailgun rates higher on G2 (4.5 vs 4.4). Ratings are aggregated from public review platforms as of the date shown.

Keep comparing

Related comparisons

Customer.io vs PostmarkEmail→Customer.io vs SendGridEmail→AWS SES vs Customer.ioEmail→Customer.io vs SparkPostEmail→Customer.io vs OneSignal EmailEmail→Customer.io vs MailjetEmail→

Why not both?

Use both behind one API.

Route Customer.io, Mailgun, or both, and switch providers without changing your code. Courier sits in front of every channel.

Start building freeRead the docs

Pricing, plans and feature availability as of August 2026 and may change. Ratings are aggregated from public review platforms. Mailgun is a Sinch product.

Multichannel Notifications Platform for SaaS