vs
Customer.io vs Resend
Both sit in email marketing. Here is how they differ on the things you can actually check.
On price: Resend starts $80 a month cheaper than Customer.io ($20 against $100, 80% less) on its Pro tier. Both figures were read from the vendors' own pricing pages on the dates shown below.
Customer.io
customer.io
Triggers messages from product events rather than lists — email, push, in-app and SMS driven by what a user actually did. Data-warehouse-friendly.
Email Marketing
Visit Customer.ioResend
resend.com
Modern transactional email API with React-based templates, a clean dashboard and SDKs for most stacks. Built by former Vercel engineers.
Free planEmail Marketing
Visit Resend| Customer.io | Resend | |
|---|---|---|
| Entry price | $100/mo | $20/mo |
| Entry plan | Essentials | Pro |
| Paid annually | — | — |
| Price checked | 21 Sept 2026 | 6 Sept 2026 |
| Pricing model | Free trial | Free plan |
| Free plan | No | Yes |
| Category | Email Marketing | Email Marketing |
| Around since | 2012 | 2023 |
Every price here was read from the vendor's own pricing page, most recently on 21 Sept 2026. Entry tier only — vendors change pricing without notice.
Customer.io vs Resend, answered
- Is Customer.io cheaper than Resend?
- No — Resend is the cheaper entry point, at $20 a month against Customer.io's $100, 80% less.
- Do Customer.io or Resend have a free plan?
- Resend publishes an ongoing free plan; Customer.io does not.
- What is the difference between Customer.io and Resend?
- Customer.io: Triggers messages from product events rather than lists — email, push, in-app and SMS driven by what a user actually did. Data-warehouse-friendly. Resend: Modern transactional email API with React-based templates, a clean dashboard and SDKs for most stacks. Built by former Vercel engineers.
