Head-to-head
Customer.io vs Mailgun
Two leading email marketing / automation tools, compared on pricing, features, and editorial fit. Updated for 2026.
Mailgun
Transactional email API for developers to send, track, and validate email
From $15/mo
Visit MailgunAt a glance
| Customer.io | Mailgun | |
|---|---|---|
| Tagline | Messaging that actually fits your data. | Transactional email API for developers to send, track, and validate email |
| Pricing model | Paid | Freemium |
| Starts at | $100/mo | $15/mo |
| Founded | 2012 | — |
| AI-native | ||
| Categories | Email Marketing, Automation | Email Marketing, Automation |
| Vendor claimed |
Quick take
Pick Customer.io if you need messaging that actually fits your data. Pick Mailgun if you need transactional email api for developers to send, track, and validate email.
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Frequently asked
- Is Customer.io better than Mailgun?
- It depends on your use case. Customer.io is messaging that actually fits your data, while Mailgun is transactional email api for developers to send, track, and validate email. See the comparison above for which fits your team.
- What's the price difference between Customer.io and Mailgun?
- Customer.io starts at $100/mo. Mailgun starts at $15/mo.
- Can I migrate from Customer.io to Mailgun?
- Most tools in this category support data import via CSV. For complex migrations, both vendors offer onboarding assistance on higher-tier plans.