Customer.io vs Mailgun: Pricing Comparison 2026
Side-by-side pricing comparison of Customer.io and Mailgun. See all plans, features, and costs at a glance.
Bottom line: Mailgun starts at $15/mo, making it $85/mo cheaper than Customer.io ($100/mo). Mailgun offers a free plan.
Last updated: March 16, 2026
Customer.io vs Mailgun: Quick Pricing Facts
| Feature | Customer.io | Mailgun |
|---|---|---|
| Starting Price | $100/mo | $15/mo |
| Number of Plans | 3 | 14 |
| Free Tier | No | Yes |
| Pricing Model | usage-based | usage-based |
| Annual Discount | N/A | N/A |
Mailgun is the more affordable option, starting at $15/mo compared to Customer.io's $100/mo. Both are Email Marketing tools with 17 combined pricing plans and 0 features compared.
Mailgun stands out with a free plan for getting started.
Review the detailed tier-by-tier comparison above to see exactly which features are included at each price point and find the best fit for your Email Marketing needs.
| Pricing Plans |  Customer.io Try it free |  Mailgun Try it free |
|---|---|---|
| Tier 1 | Essentials $100/monthCheapest | Enterprise: Send high-volume emails through the most reliable email API provider. Custom pricing |
| Tier 2 | Premium $1000/monthCheapest | Documentation: API resources to help you use Mailgun Custom pricing |
| Tier 3 | Enterprise Custom pricing | Release Notes: Keep up with what's in the Mailgun platform. Custom pricing |
| Tier 4 | — | 2025 State of Email Deliverability Research Report $2025/monthCheapest |
| Tier 5 | — | $0/mo $0/monthCheapest |
| Tier 6 | — | 100 emails/day included $100/monthCheapest |
| Tier 7 | — | $15/mo $15/monthCheapest |
| Tier 8 | — | 10,000 emails/mo included $10000/monthCheapest |
| Tier 9 | — | Extra emails Custom pricing |
| Tier 10 | — | $35/mo $35/monthCheapest |
| Tier 11 | — | 50,000 emails/mo included $50000/monthCheapest |
| Tier 12 | — | Extra emails & validations Custom pricing |
| Tier 13 | — | $90/mo $90/monthCheapest |
| Tier 14 | — | 100,000 emails/mo included $100000/monthCheapest |
Swipe to compare plans →
Mailgun
Mailgun offers a free plan, starts at $85/mo lower ($15/mo vs $100/mo), offers 14 tiers vs 3.
Based on pricing data only. Review the full comparison below for your specific needs.
Best value: Mailgun
Try Mailgun freeWhich Should You Choose?
Choose Customer.io if:
- •Customer.io's 3-tier usage-based structure gives clearer cost visibility for budget planning
- •You value Customer.io's specific feature progression from free to advanced tier levels
- •Customer.io's approach to Email Marketing reflects how modern teams actually use these tools
Choose Mailgun if:
- •You want lower per-user costs—Mailgun starts at $15/mo, saving $85/mo compared to Customer.io at $100/mo
- •You need a free plan with core features—Mailgun offers no-cost access with no credit card required
- •You need 14 pricing tiers for flexible team sizing—more options mean less overpaying for features you don't need
Mailgun is the more affordable choice [1], starting at $15/mo compared to Customer.io's $100/mo. For a 50-person team on paid plans, this translates to Mailgun saving approximately $4250/month. Mailgun offers 14 pricing tiers compared to Customer.io's 3, giving you more granular control over scaling costs as your team grows. The pricing math favors Mailgun for most team sizes. Customer.io becomes worth the premium only when its differentiating features are central to your workflow.
Frequently Asked Questions: Customer.io vs Mailgun
Which is cheaper, Customer.io or Mailgun?
How many pricing plans does Customer.io have vs Mailgun?
Does Customer.io or Mailgun offer a free plan?
Does Customer.io or Mailgun offer custom enterprise pricing?
How do Customer.io and Mailgun compare for Email Marketing?
Sources
- Customer.io Official Pricing— Vendor pricing page
- Mailgun Official Pricing— Vendor pricing page
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