Customer.io vs SendGrid

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

Customer.io wins reviewsSendGrid wins price and deliverability

Updated August 2026

At a glanceCustomer.ioSendGrid
Cost per 1k @ 100k—$0.35
G2 rating4.44.0
Trustpilot3.21.3
Drag-and-drop editorYesYes

THE VERDICT

Customer.io wins on reviews. SendGrid wins on price and deliverability.

Customer.io and SendGrid take different pricing approaches. Customer.io rates higher with developers (4.4 vs 4.0 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 SendGrid

✓It's great for brands and firms that want to get emails across in ample time.
✓It is an affordable option if you send out newsletters but do not intend to profit from them.
✓It is a great option if you're building software and need a reliable email service.
Set up SendGrid with Courier →

Feature by feature

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

capability
Customer.io
SendGrid
Starting paid plan
$100/mo
$19.95/mo
Cost per 1k @ 100k
—
$0.35
Pricing model
Subscription
Subscription
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.
upgrade tier / per-block overage
Dedicated IP
Plan-gated
Plan-gated
Deliverability tooling
Yes
Yes
Automated IP warmup
Yes
Yes
Suppression management
Yes
Yes
SPF / DKIM / DMARC
Yes
Yes
BIMI
—
Yes
Transactional API
Yes
Yes
Marketing campaigns
Yes
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
Node.js, Python, PHP, Ruby, Go, Java, C#
Event webhooks
Yes
Yes
Drag-and-drop editor
Yes
Yes
Custom HTML editor
Yes
Yes
Email validation
No
Plan-gated
Log retention
—
3 days default; 30 days add-on
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
No
GDPR
Yes
Yes
ISO 27001
Yes
Yes
Support channels
Community + email (Essentials); chat (Standard); dedicated CSM + technical specialist (Premium/Enterprise)
Email/Ticket, Chat, Phone
24/7 support
—
Yes
Support SLA
Plan-gated
Plan-gated
Migration assistance
Yes
Yes

FAQ

Common questions

Customer.io rates higher on G2 (4.4 vs 4.0). Ratings are aggregated from public review platforms as of the date shown.

Keep comparing

Related comparisons

Customer.io vs PostmarkEmail→Customer.io vs MailgunEmail→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, SendGrid, 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. SendGrid is a Twilio product.

Multichannel Notifications Platform for SaaS