Two transactional email providers, compared on price, features and ratings, so you can pick fast.
AWS SES wins price and deliverabilityCustomer.io wins sending APIs and reviews
Updated August 2026
At a glanceAWS SESCustomer.io
Cost per 1k @ 100k$0.1—
G2 rating4.24.4
Trustpilot2.33.2
Drag-and-drop editorNoYes
THE VERDICT
AWS SES wins on price and deliverability. Customer.io wins on sending APIs and reviews.
AWS SES and Customer.io take different pricing approaches. Customer.io rates higher with developers (4.4 vs 4.2 on G2). Pick based on volume and team, and the scorecard below breaks down where each one leads.
Which should you choose?
Pick AWS SES
✓It is suitable for developers on the AWS ecosystem who want to integrate a mailing system into their software.
✓It is suitable for firms or brands to send bulk transactional emails.
✓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
Feature by feature
Winner cells are tinted, green where AWS SES leads, violet where Customer.io does.
capability
AWS SES
Customer.io
Pricing
Starting paid plan
$0/mo
$100/mo
Cost per 1k @ 100k
$0.1
—
Pricing model
Pay-as-you-go
Subscription
Overage
$0.10 per 1,000 emails (flat Pay-as-you-go)
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.
Deliverability
Dedicated IP
Add-on
Plan-gated
Deliverability tooling
Yes
Yes
Automated IP warmup
Yes
Yes
Suppression management
Yes
Yes
SPF / DKIM / DMARC
Yes
Yes
BIMI
Yes
—
API & sending
Transactional API
Yes
Yes
Marketing campaigns
No
Yes
SMTP relay
Yes
Yes
Inbound routing
Yes
No
Dynamic templates
Yes
Yes
Batch send
Yes
Yes
Scheduled send
—
Yes
Developer experience
Official SDKs
Java, Python, JavaScript/Node.js, .NET, Ruby, Go, PHP, C++